2024 |
Hasnain MG, Garcia-Esperon C, Tomari YK, Walker R, Saluja T, Rahman MM, et al., 'Bushfire-smoke trigger hospital admissions with cerebrovascular diseases: Evidence from 2019 20 bushfire in Australia', European Stroke Journal, [C1]
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2024 |
Cui B, Tian T, Duan L, Rong H, Chen Z, Luo S, et al., 'Towards advanced removal of organics in persulfate solution by heterogeneous iron-based catalyst: A review', Journal of Environmental Sciences (China), (2024) [C1]
Heterogeneous iron-based catalysts have drawn increasing attention in the advanced oxidation of persulfates due to their abundance in nature, the lack of secondary pollution to th... [more]
Heterogeneous iron-based catalysts have drawn increasing attention in the advanced oxidation of persulfates due to their abundance in nature, the lack of secondary pollution to the environment, and their low cost over the last a few years. In this paper, the latest progress in the research on the activation of persulfate by heterogeneous iron-based catalysts is reviewed from two aspects, in terms of synthesized catalysts (Fe0, Fe2O3, Fe3O4, FeOOH) and natural iron ore catalysts (pyrite, magnetite, hematite, siderite, goethite, ferrohydrite, ilmenite and lepidocrocite) focusing on efforts made to improve the performance of catalysts. The advantages and disadvantages of the synthesized catalysts and natural iron ore were summarized. Particular interests were paid to the activation mechanisms in the catalyst/PS/pollutant system for removal of organic pollutants. Future research challenges in the context of field application were also discussed.
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2024 |
Liu Y, Wang F, Wang Z, Xiang L, Fu Y, Zhao Z, et al., 'Soil properties and organochlorine compounds co-shape the microbial community structure: A case study of an obsolete site', Environmental Research, 240 (2024) [C1]
Organochlorine compounds (OCs) such as chlorobenzenes (CB) are persistent organic pollutants that are ubiquitous in soils at organochlorine pesticides (OCP) production sites. Long... [more]
Organochlorine compounds (OCs) such as chlorobenzenes (CB) are persistent organic pollutants that are ubiquitous in soils at organochlorine pesticides (OCP) production sites. Long-term contamination with OCs might alter the soil microbial structure and further affect soil functions. However, the effects of OCs regarding the shaping of microbial community structures in the soils of OCs-contaminated sites remain obscure, especially in the vertical soil profile where pollutants are highly concealed. Hence this paper explored the status and causes of OCs pollution (CB, hexachlorocyclohexane (HCH), and dichlorodiphenyltrichloroethane (DDT)) in an obsolete site, and its combined effects with soil properties (pH, available phosphorus (AP), dissolved organic carbon (DOC), etc) on microbial community structure. The mean total concentration of OCs in the subsoils was up to 996 times higher than that in the topsoils, with CB constituting over 90% of OCs in the subsoil. Historical causes, anthropogenic effects, soil texture, and the nature of OCs contributed to the differences in the spatial distribution of OCs. Redundancy analysis revealed that both the soil properties and OCs were important factors in shaping microbial composition and diversity. Variation partitioning analysis further indicated that soil properties had a greater impact on microbial community structure than OCs. Significant differences in microbial composition between topsoils and subsoils were observed through linear discriminant analysis effect size (LEfSe) analysis, primarily driven by different pollutant conditions. Additionally, co-occurrence network analysis indicated that heavily contaminated subsoils exhibited closer and more intricate bacterial community interactions compared to lightly contaminated topsoils. This work reveals the impact of environmental factors in co-shaping the structure of soil microbial communities. These findings advance our understanding of the intricate interplay among organochlorine pollutants, soil properties, and microbial communities, and provides valuable insights into devising effective management strategies in OCs-contaminated soils.
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2024 |
Nasif SO, Nuruzzaman M, Naidu R, 'Porous Silica Nanocarriers: Advances in Structural Orientation and Modification to Develop Sustainable Pesticide Delivery Systems', ACS Agricultural Science & Technology, 4 144-172 (2024) [C1]
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2024 |
Cui B, Rong H, Tian T, Guo D, Duan L, Nkinahamira F, et al., 'Chemical methods to remove microplastics from wastewater: A review.', Environ Res, 249 118416 (2024) [C1]
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2024 |
Paul SK, Xi Y, Sanderson P, Naidu R, 'Controlled release herbicide formulation for effective weed control efficacy.', Sci Rep, 14 4216 (2024)
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2024 |
Davamani V, John JE, Poornachandhra C, Gopalakrishnan B, Arulmani S, Parameswari E, et al., 'A Critical Review of Climate Change Impacts on Groundwater Resources: A Focus on the Current Status, Future Possibilities, and Role of Simulation Models', ATMOSPHERE, 15 (2024) [C1]
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2024 |
Fang C, Luo Y, Naidu R, 'Advancements in Raman imaging for nanoplastic analysis: Challenges, algorithms and future Perspectives', Analytica Chimica Acta, 1290 342069-342069 (2024) [C1]
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2024 |
Fang C, Zhou W, Hu J, Wu C, Niu J, Naidu R, 'Paint has the potential to release microplastics, nanoplastics, inorganic nanoparticles, and hybrid materials', Environmental Sciences Europe, 36 (2024) [C1]
Background: When we paint our houses or offices, we might paint plastic, because most paints are generally formulated with polymer binders. After drying and curing, the binders fi... [more]
Background: When we paint our houses or offices, we might paint plastic, because most paints are generally formulated with polymer binders. After drying and curing, the binders fix the colourants on the painted surface as a film of plastic mixture, which is tested herein using Raman imaging to analyse and directly visualise the hybrid plastic-colourant (titanium dioxide or TiO2 nanoparticles). Results: For the plastic mixture or hybrid, the co-existence and competition between the Raman signals of plastic and TiO2 complicate the individual analysis, which should be carefully extracted and separated in order to avoid the weak signal of plastic to be masked by that of TiO2. This is particularly important when considering the Raman activity of TiO2 is much stronger than that of plastic. Plastic is observed to coat the TiO2 nanoparticle surface, individually or as a bulk to embed the TiO2 nanoparticles as mixture or hybrid. Once branched, pended, scratched or aged, the paint can also be peeled off from the painted surface, including gyprock, wood and glass, releasing microplastics and nanoplastics (coating onto the individual TiO2 nanoparticle surface or embedding the TiO2 nanoparticles, or individually as particles) in potential. Conclusions: Our test sends us a warning that we are surrounded by plastic items that might release microplastics and nanoplastics in potential, for which the risk assessment is needed. Overall, Raman imaging is a suitable approach to effectively characterise microplastics and nanoplastics, even from the mixture with the hybrid background and the complicated interference. Graphical Abstract: [Figure not available: see fulltext.]
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2024 |
Fang C, Awoyemi OS, Saianand G, Xu L, Niu J, Naidu R, 'Characterising microplastics in indoor air: Insights from Raman imaging analysis of air filter samples', Journal of Hazardous Materials, 464 (2024) [C1]
We are directly exposed to microplastic contamination via indoor air that we breathe daily, for which the characterisation of microplastics is still a challenge. Herein, two typic... [more]
We are directly exposed to microplastic contamination via indoor air that we breathe daily, for which the characterisation of microplastics is still a challenge. Herein, two typical air filter samples were collected, one from an air-conditioner and another from a personal computer, both of which have been working for around half a year to collect and accumulate microplastics in the indoor air, like microplastic banks. After the sample preparation to remove the mineral dusts, Raman imaging was employed to directly and simultaneously identify and visualise microplastics of polyethylene terephthalate (PET) fibres, distinguish them from other fibres such as cellulose and cross-check them with a scanning electron microscope (SEM). To count the microplastics and to avoid the quantification bias, several areas were randomly scanned and imaged to statistically estimate the percentage of microplastic fibres in the analysed samples. The microplastics amount, which has been estimated at 73¿88,000 fibers per filter per half a year, varies and depends on the indoor environment so that the air filter can work as a good indicator to monitor the quality of the indoor air from the microplastic perspective. Overall, human are directly exposed to this emerging contamination every day, raising environmental concerns. Raman imaging characterisation and its corresponding statistical information can help pursue further research on microplastics.
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2024 |
Umeh AC, Naidu R, Olisa E, Liu Y, Qi F, Bekele D, 'A systematic investigation of single solute, binary and ternary PFAS transport in water-saturated soil using batch and 1-dimensional column studies: Focus on mixture effects.', Journal of hazardous materials, 461 132688 (2024) [C1]
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2024 |
Luo Y, Awoyemi O, Liu S, Niu J, Naidu R, Fang C, 'From celebration to contamination: Analysing microplastics released by burst balloons.', J Hazard Mater, 464 133021 (2024) [C1]
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2024 |
Wang L, Gopalan S, Naidu R, 'Advancements in nanotechnological approaches to volatile organic compound detection and separation', Current Opinion in Environmental Science & Health, 37 100528-100528 (2024)
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2023 |
Rahman Z, Thomas L, Chetri SPK, Bodhankar S, Kumar V, Naidu R, 'A comprehensive review on chromium (Cr) contamination and Cr(VI)-resistant extremophiles in diverse extreme environments.', Environ Sci Pollut Res Int, 30 59163-59193 (2023) [C1]
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2023 |
Wang L, Cheng Y, Wu C, Luo F, Lin Z, Naidu R, 'Rapid on-site detection of underground petroleum pipeline leaks and risk assessment using portable gas chromatography-mass spectrometry and solid phase microextraction.', J Chromatogr A, 1696 463980 (2023) [C1]
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2023 |
Fang C, Luo Y, Naidu R, 'Super-resolution imaging of micro- and nanoplastics using confocal Raman with Gaussian surface fitting and deconvolution', Talanta, 265 124886-124886 (2023) [C1]
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2023 |
Fang C, Naidu R, 'A review of perchlorate contamination: Analysis and remediation strategies.', Chemosphere, 338 139562 (2023) [C1]
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2023 |
Islam MM, Mohana AA, Rahman MA, Rahman M, Naidu R, Rahman MM, 'A Comprehensive Review of the Current Progress of Chromium Removal Methods from Aqueous Solution', TOXICS, 11 (2023) [C1]
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2023 |
Luo Y, Naidu R, Fang C, 'Raman imaging towards in-situ visualisation of perchlorate adsorption', Water Research, 229 (2023) [C1]
Raman imaging can directly visualise perchlorate adsorption, and even enables in-situ monitoring, because water has a low Raman activity and generates almost no interference, whic... [more]
Raman imaging can directly visualise perchlorate adsorption, and even enables in-situ monitoring, because water has a low Raman activity and generates almost no interference, which is demonstrated herein. The Raman signal enhancement of perchlorate on the porous silver surface provides a possibility to monitor the adsorption of perchlorate at low level. From this initial adsorption assembly of (i) porous silver-perchlorate, we test several more, including (ii) porous silver-perchlorate-sand, (iii) porous silver-perchlorate-microplastic-sand, (iv) porous silver-perchlorate-microplastic-sand-river water etc. The introduction of microplastic, another emerging contaminant, can provide extra insights into the co-adsorption process. Particularly the composite structure of microplastic-sand can simultaneously visualise the adsorption of perchlorate on the silver surface, the plastic/organic surface and the sand surface. We note that the water can modify the configuration of perchlorate in-situ towards the adsorption on silver surface; the adsorption of perchlorate can benefit from co-adsorption with organic matter, and the rough surface plays an important role as well. Overall, Raman imaging provides an effective approach to directly visualise the adsorption of emerging contaminants.
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2023 |
Fang C, Luo Y, Naidu R, 'Super-resolution Raman imaging towards visualisation of nanoplastics', ANALYTICAL METHODS, 15 5300-5310 (2023)
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2023 |
Sarkar MIU, Shahriar S, Naidu R, Rahman MM, 'Concentrations of potentially toxic and essential trace elements in marketed rice of Bangladesh: Exposure and health risks', Journal of Food Composition and Analysis, 117 (2023) [C1]
Rice is a major dietary source of essential trace elements required for the human body but also can be an exposure pathway to different potentially toxic trace elements. This stud... [more]
Rice is a major dietary source of essential trace elements required for the human body but also can be an exposure pathway to different potentially toxic trace elements. This study determined various essential and toxic trace elements in rice from Bangladeshi markets and their possible health risks. Concentrations of essential and toxic trace elements in rice varied significantly from location to location. Mean concentrations (mg kg-1 as dry weight) of essential trace elements were found in the following order - Zn>Mn>Cu>Fe>Mo>Se>Co - and were within their maximum allowable limits. The average concentrations (mg kg-1) of toxic trace elements were as follows: As: 0.17, Cr: 0.18, Ni: 0.55 and Pb: 0.18, while 7% and 40% of the rice samples surpassed, respectively, the EU recommended limits of As and Pb. This study revealed that rice could be a primary exposure pathway of toxic elements, leading to either noncarcinogenic or carcinogenic health problems for daily rice consumers. The non-carcinogenic health risk was mainly associated with As which contributed 77% to the hazard index. The carcinogenic risk measured as incremental lifetime cancer risk (ILCR) was high (>10-4) with As, Cr and Ni, while Pb showed a moderate (<10-4) carcinogenic risk to adults. Rice can substantially be contaminated by trace elements other than As with potential human health risks. Consequently, regular monitoring of the marketed rice grain is demanded, backed up by viable mitigation strategies for reducing toxic elements uptake by rice grains.
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2023 |
Al Amin M, Luo Y, Shi F, Yu L, Liu Y, Nolan A, et al., 'A modified TOP assay to detect per- and polyfluoroalkyl substances in aqueous film-forming foams (AFFF) and soil.', Front Chem, 11 1141182 (2023) [C1]
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2023 |
Paul SK, Xi Y, Sanderson P, Deb AK, Islam MR, Naidu R, 'Investigation of herbicide sorption-desorption using pristine and organoclays to explore the potential carriers for controlled release formulation.', Chemosphere, 337 139335 (2023) [C1]
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2023 |
Luo Y, Awoyemi OS, Naidu R, Fang C, 'Detection of microplastics and nanoplastics released from a kitchen blender using Raman imaging', Journal of Hazardous Materials, 453 131403-131403 (2023) [C1]
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2023 |
Samarasinghe SVAC, Krishnan K, Aitken RJ, Naidu R, Megharaj M, 'Chronic effects of TiO2 and ZnO nanoparticles to earthworm Eisenia fetida', Environmental Chemistry and Ecotoxicology, 5 129-134 (2023) [C1]
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2023 |
Wang L, Cheng Y, Gopalan S, Luo F, Amreen K, Singh RK, et al., 'Review and Perspective: Gas Separation and Discrimination Technologies for Current Gas Sensors in Environmental Applications.', ACS Sens, 8 1373-1390 (2023) [C1]
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2023 |
Al Amin M, Luo Y, Nolan A, Mallavarapu M, Naidu R, Fang C, 'Thermal kinetics of PFAS and precursors in soil: Experiment and surface simulation in temperature-time plane.', Chemosphere, 318 138012 (2023) [C1]
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2023 |
Al-Gheethi AA, Alagamalai RA, Noman EA, Saphira Radin Mohamed RM, Naidu R, 'Degradation of cephalexin toxicity in non-clinical environment using zinc oxide nanoparticles synthesized in Momordica charantia extract; Numerical prediction models and deep learning classification', Chemical Engineering Research and Design, 192 180-193 (2023) [C1]
Antibiotics in nonclinical environments represent a serious risk to human health due to their role in the antimicrobial resistance. The present study aimed to optimise the detoxif... [more]
Antibiotics in nonclinical environments represent a serious risk to human health due to their role in the antimicrobial resistance. The present study aimed to optimise the detoxification of cephalexin (CFX) by the Momordica charantia extract zinc oxide nanoparticle catalyst (MCZnO NPs) as a function of dosage of ZnO NPs, time, pH and CFX using the artificial neural network model (ANN). The effect was simulated using deep learning analysis to evaluate and explain the behaviour of CFX degradation. Interactions between these factors and the classification of the photocatalysis (low, medium, average, good and high) were analyzed using factor of principal component analysis (F, PCA), discriminant analysis (DA) and Agglomerative hierarchical clustering (AHC). MCZnO NPs have a white colour, spherical shape, non-agglomerated, smooth surface and size-wise they ranged from 50 to 100 nm. The ANN results indicated that 88.87% of CFX was degraded using 50 mg/L of MCZnO NP, 40 mg/L of CFX, at pH 9, and after 180 min. Simulation analysis revealed that MCZnO NPs were efficient in degrading CFX concentrations (up to 60 mg/L) with 100% removed depending on pH and time. The interaction between F1 and F2 was 94.59% at which pH (x2) and CFX (x4)factors exhibited a high correlation with a synergistic effect on CFX degradation, 20% of the degradation of CFX could be classified as a high percentage (>90%). These findings reflected the role of deep learning analysis in understanding the behavior of CFX for the degradation process.
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2023 |
Unnithan A, Bekele D, Samarasinghe C, Chadalavada S, Naidu R, 'Evaluating the role of preferential pathways in exacerbating vapour intrusion risks', Journal of Hazardous Materials Advances, 10 100310-100310 (2023) [C1]
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2023 |
Luo Y, Naidu R, Fang C, 'Accelerated transformation of plastic furniture into microplastics and nanoplastics by fire.', Environ Pollut, 317 120737 (2023) [C1]
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2023 |
Khan AUH, Liu Y, Fang C, Naidu R, Shon HK, Rogers Z, Dharmarajan R, 'A comprehensive physicochemical characterization of zinc oxide nanoparticles extracted from sunscreens and wastewaters', Environmental Advances, 12 100381-100381 (2023) [C1]
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2023 |
Majid N, Bahar MM, Harper R, Megharaj M, Naidu R, 'Influence of biotic and abiotic factors on the development of non-wetting soils and management approaches: A review', Soil Security, 11 100091-100091 (2023) [C1]
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2023 |
Fang C, Gopalan S, Zhang X, Xu L, Niu J, Naidu R, 'Raman imaging to identify microplastics released from toothbrushes: algorithms and particle analysis.', Environ Pollut, 337 122510 (2023) [C1]
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2023 |
Fang C, Luo Y, Naidu R, 'Microplastics and nanoplastics analysis: Options, imaging, advancements and challenges', TrAC Trends in Analytical Chemistry, 166 117158-117158 (2023) [C1]
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2023 |
Ghavamifar S, Naidu R, Mozafari V, Li Z, 'Can calcite play a role in the adsorption of glyphosate? A comparative study with a new challenge.', Chemosphere, 311 136922 (2023) [C1]
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2023 |
Wijayawardena MAA, Yan K, Liu Y, Naidu R, 'Can the mouse model successfully predict mixed metal(loid)s bioavailability in humans from contaminated soils?', Chemosphere, 311 137113 (2023) [C1]
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2023 |
Islam MR, Sanderson P, Johansen MP, Payne TE, Naidu R, 'Environmental chemistry response of beryllium to diverse soil-solution conditions at a waste disposal site.', Environmental science. Processes & impacts, 25 94-109 (2023) [C1]
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2023 |
Fang C, Luo Y, Naidu R, 'Super-resolution Raman imaging towards visualisation of nanoplastics.', Anal Methods, 15 5300-5310 (2023) [C1]
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2023 |
Hasnain MG, Garcia-Esperon C, Tomari YK, Walker R, Saluja T, Rahman MM, et al., 'Effect of short-term exposure to air pollution on daily cardio- and cerebrovascular hospitalisations in areas with a low level of air pollution', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 30 102438-102445 (2023)
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2023 |
Dietrich M, Barlow CF, Entwistle JA, Meza-Figueroa D, Dong C, Gunkel-Grillon P, et al., 'Predictive modeling of indoor dust lead concentrations: Sources, risks, and benefits of intervention', Environmental Pollution, 319 (2023) [C1]
Lead (Pb) contamination continues to contribute to world-wide morbidity in all countries, particularly low- and middle-income countries. Despite its continued widespread adverse e... [more]
Lead (Pb) contamination continues to contribute to world-wide morbidity in all countries, particularly low- and middle-income countries. Despite its continued widespread adverse effects on global populations, particularly children, accurate prediction of elevated household dust Pb and the potential implications of simple, low-cost household interventions at national and global scales have been lacking. A global dataset (~40 countries, n = 1951) of community sourced household dust samples were used to predict whether indoor dust was elevated in Pb, expanding on recent work in the United States (U.S.). Binned housing age category alone was a significant (p < 0.01) predictor of elevated dust Pb, but only generated effective predictive accuracy for England and Australia (sensitivity of ~80%), similar to previous results in the U.S. This likely reflects comparable Pb pollution legacies between these three countries, particularly with residential Pb paint. The heterogeneity associated with Pb pollution at a global scale complicates the predictive accuracy of our model, which is lower for countries outside England, the U.S., and Australia. This is likely due to differing environmental Pb regulations, sources, and the paucity of dust samples available outside of these three countries. In England, the U.S., and Australia, simple, low-cost household intervention strategies such as vacuuming and wet mopping could conservatively save 70 billion USD within a four-year period based on our model. Globally, up to 1.68 trillion USD could be saved with improved predictive modeling and primary intervention to reduce harmful exposure to Pb dust sources.
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2023 |
Umeh AC, Stegh J, Naidu R, 'Toward In Situ Sequestration of Multicomponent PFAS Using Injectable Adsorbent Suspensions', ACS ES&T Water, 3 3858-3873 (2023) [C1]
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2023 |
Bharos AMK, Vishwakarma A, Bharos A, Naidu R, 'Diversity and conservation status of avifauna in the Surguja region, Chhattisgarh, India', Journal of Threatened Taxa, 15 23710-23728 (2023) [C1]
This study is aimed at updating the avifauna status and to assess major threats in six districts of the Surguja region of northern Chhattisgarh. The avifauna of this region is les... [more]
This study is aimed at updating the avifauna status and to assess major threats in six districts of the Surguja region of northern Chhattisgarh. The avifauna of this region is less studied as compared to the central and southern regions of the state. Chhattisgarh has unique and important habitats for bird species. The geographical region has two major forest types which provide a suitable habitat for many terrestrial and numerous wetlands that support aquatic bird species. The northern region is a basin of rivers Hasdeo and Rihand, prominently forested and a major coal belt. In this study, planned and opportunistic surveys were done in different seasons, and data was collected from 1995 to 2019. In the northern Chhattisgarh region,we have compiled all-district data and a total of 361 bird species were recorded. The maximum number of bird species were recorded from Koriya 318, followed by Raigarh 262, Surguja 162, Balrampur 260, Surajpur 208, and Jashpur 254. Species recorded include three Critically Endangered (CR), two Endangered (EN), five Vulnerable (VU), and 13 Near Threatened (NT). Nesting of Lesser Adjutant, Indian Vulture, White-rumped Vulture, Egyptian Vulture, and sighting of Sarus Crane in Surguja region is reported. The study also revealed the presence of nine Himalayan and sub-Himalayan species. Comparing with previous studies 117 new species were found. Chhattisgarh has ample potential and opportunities for new records as many regions have not yet been adequately explored, it can be a key birding hub for bird lovers as well as the scientific community. The large-scale miningoriented activities, hunting, and poaching are posing serious threats, which will have a direct or indirect, impact on the future of the avifauna of the region.
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2023 |
Biswas B, Islam MR, Deb AK, Greenaway A, Warr LN, Naidu R, 'Understanding Iron Impurities in Australian Kaolin and Their Effect on Acid and Heat Activation Processes of Clay', ACS Omega, 8 5533-5544 (2023) [C1]
Iron impurities present in the crystal structure of kaolin minerals or in accessory species are frequently encountered in clay deposits. As knowledge of the location and states of... [more]
Iron impurities present in the crystal structure of kaolin minerals or in accessory species are frequently encountered in clay deposits. As knowledge of the location and states of the iron is crucial when modifying the properties of clays by activation, it is important that new deposits are well characterized in terms of the amount and location of this metal. The Western Australia Noombenberry deposit has been identified as a large resource of kaolin composed largely of halloysite and kaolinite. We sampled six from one hundred drill holes and grouped them according to major mineral and iron impurities. First, we characterized them to understand the source of iron impurities. Then, we performed three physicochemical activation processes of samples involving acid treatment (by 3 M HCl), heating at 600 °C, and a combination of both. State-of-the-art tools, including X-ray diffraction, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy, and nuclear magnetic resonance, revealed the properties of kaolin, iron impurities, and the changes incurred after activation. The iron impurities were found to be linked to non-kaolin minerals, i.e., in mica or illite. Once the iron was removed mainly by acid activation, the surface area, pore volume, and negative surface charges increased, and that was significant for halloysite-rich samples. These properties helped adsorb N2 gas compared to the raw kaolin. Therefore, knowing the iron¿s location and states in associated mineral species and their dissolution/retention may expand the scope of material development for gas adsorption. They are also useful in other applications like clay purification and adsorbent or additive formulations.
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2023 |
Lei Y, Hou J, Fang C, Tian Y, Naidu R, Zhang J, et al., 'Ultrasound-based advanced oxidation processes for landfill leachate treatment: Energy consumption, influences, mechanisms and perspectives.', Ecotoxicol Environ Saf, 263 115366 (2023) [C1]
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2023 |
Vidane Arachchige Chamila Samarasinghe S, Krishnan K, John Aitken R, Naidu R, Megharaj M, 'Multigenerational effects of TiO2 rutile nanoparticles on earthworms.', Environ Pollut, 336 122376 (2023) [C1]
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2023 |
Islam MR, Sanderson P, Payne TE, Naidu R, 'Synthesised and modified zeolite for effective management of beryllium contaminants in aqueous media under different conditions.', Sci Total Environ, 904 166384 (2023) [C1]
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2023 |
Sarkar MIU, Islam S, Hosain MT, Naidu R, Rahman MM, 'Distribution of essential and non-essential elements in rice-based products sold in Australian markets: Exposure assessment', Journal of Food Composition and Analysis, 120 (2023) [C1]
Rice-derived food products could be a major dietary source of both essential and non-essential elements to people; hence it is crucial to assess their concentrations to ensure the... [more]
Rice-derived food products could be a major dietary source of both essential and non-essential elements to people; hence it is crucial to assess their concentrations to ensure the safe consumption of these products. In this study, six different types of rice-based products collected from Australian markets were analysed for essential and non-essential elements to evaluate the exposure and health risk. The estimated intake (EI) of essential elements from baby rice substantially contributed to the recommended dietary allowance of Fe (27%) and Mn (43%) for infants compared to different rice-based products for children and adults. The EI values of Cd, Cr, Ni and Pb were 0.15 ¿ 1.17, 5.68 ¿ 16.24, 7.47 ¿ 16.24 and 0.40 ¿ 1.21 µg, respectively, from an average recommended serving of different rice-based products. Compared to the tolerable daily intake (TDI) and tolerable weekly intake (TWI) provided by the European Food Safety Authority (EFSA), both average daily intake (ADI) and average weekly intake (AWI) values of the respective non-essential elements were much lower. Thus, this study results indicated that the rice-based products pose no potential health risk to consumers although regular monitoring is necessary to reduce health risks especially for infants and children.
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2023 |
Lei Y, Zhao L, Fang C, Naidu R, Tian D, Zhao L, et al., 'A novel enhanced defluorination of perfluorooctanoic acids by surfactant-assisted ultrasound coupling persulfate', Separation and Purification Technology, 317 (2023) [C1]
A novel enhanced defluorination of perfluorooctanoic acids (PFOA) by surfactant-assisted ultrasound (US) coupling persulfate (PS) was proposed in this study. Instead of adding the... [more]
A novel enhanced defluorination of perfluorooctanoic acids (PFOA) by surfactant-assisted ultrasound (US) coupling persulfate (PS) was proposed in this study. Instead of adding the surfactant into the PFOA solution directly, the promoted defluorination was obtained by adding the surfactant to the US bath outside of the PFOA reactor. In this situation, the effects of the critical micelle concentration (CMC), concentration and type of the surfactant, the US frequency and the pH of the US bath liquid on the PFOA defluorination were investigated. The results demonstrated that the PFOA defluorination at low-frequency levels (25 kHz-59 kHz) was facilitated by raising US frequency. Besides, the addition of three surfactants (Triton X-100, sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB)) all increased the PFOA defluorination by Triton X-100 > CTAB > SDS, which is opposed to their CMC (Triton X-100: 0.28 mM<CTAB: 1.07 mM<SDS: 7.69 mM). Rising the surfactant concentration would not enhance the defluorination, the best one was obtained at its CMC. Moreover, changing the pH of the US bath liquid by adding acid or alkaline solution inhibited the defluorination, which might be attributed to acid or base causing damage to the chemical properties or physical structure of surfactant (certified by the SEM tests). Additionally, the mechanism of enhanced PFOA defluorination was examined by electron paramagnetic resonance analysis, which proved that adding surfactant facilitated the generation of the radicals (·OH and SO4·-), as well as the radicals¿ amount increased over time during 60 min. Finally, the inhibited defluorination of adding surfactant directly to the PFOA solution was studied by the SEM analysis, the results demonstrated that adsorption and wrapping between surfactant micelles and PFOA reduced the contact between PFOA and radicals and affected the surfactant effect on the surface tension.
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2023 |
Warner SD, Bekele D, Nathanail CP, Chadalavada S, Naidu R, 'Climate-influenced hydrobiogeochemistry and groundwater remedy design: A review', Remediation Journal, 33 187-207 (2023) [C1]
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2023 |
Samarasinghe SVAC, Bahar MM, Qi F, Yan K, Liu Y, Naidu R, 'Evaluating PFHxS toxicity to invertebrates and microbial processes in soil', Environmental Chemistry and Ecotoxicology, 5 120-128 (2023) [C1]
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2023 |
Rathnayake IVN, Megharaj M, Naidu R, 'Sol-Gel Immobilized Optical Microalgal Biosensor for Monitoring Cd, Cu and Zn Bioavailability in Freshwater.', Bull Environ Contam Toxicol, 110 73 (2023) [C1]
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2023 |
Yu L, Duan L, Naidu R, Meng F, Semple KT, 'Effects of source materials on desorption kinetics of carcinogenic PAHs from contaminated soils', Chemosphere, 335 (2023) [C1]
Research investigating the desorptive behaviour of PAHs from contaminated soils often overlooked the effects of source materials, especially coal tar and coal tar pitch and materi... [more]
Research investigating the desorptive behaviour of PAHs from contaminated soils often overlooked the effects of source materials, especially coal tar and coal tar pitch and materials alike. In this study, a refined experimental approach was adopted to establish a simple-to-complex continuum of systems that allow the investigation of desorption kinetics of benzo(a)pyrene (BaP) and 3 other carcinogenic PAHs (cPAHs) over an incubation period of 48 d. By comparing the modelled desorption parameters, elucidation of the effects of PAH source materials on their desorptive behaviour was achieved. Desorption of cPAHs from coal tar and pitch was enhanced when they were added to soils, with rapidly desorbing fraction (Frap) of BaP increased from 0.68% for pitch to 1.10% and 2.66% for pitch treated soils, and from 2.57% for coal tar to 6.24% for coal tar treated soil G and 8.76% for coal tar treated sand (1 d). At 1 d, desorption of target cPAHs from solvent and source material spiked soils generally followed the order of solvent > coal tar > pitch. Increases in Frap of cPAHs were observed in coal tar-treated soils after 48 d soil incubation (0.33%¿1.16% for soil M, p = 0.05, 6.24%¿9.21% for soil G, p < 0.05) and was attributed to the continuous migration of coal tar as a non-aqueous phase liquid (NAPL) into soil pore structures. Slow desorption was dominated by source materials, whereas the extents and rates of rapid desorption (Frap and krap) were more controlled by the quantity of soil organic matter (SOM), rather than quality of SOM (as in solvent-spiked soils). The results of this study challenged the role of PAH source materials as ¿sinks¿ and led to the proposed roles of coal tar and pitch and source materials alike as ¿reservoirs¿ with a risk-driven perspective.
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Sanchez-Hernandez JC, Narváez C, Cares XA, Sabat P, Naidu R, 'Predicting the bioremediation potential of earthworms of different ecotypes through a multi-biomarker approach.', Sci Total Environ, 862 160547 (2023) [C1]
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2023 |
Kumar Paul S, Xi Y, Sanderson P, Naidu R, 'Investigation of the physicochemical properties of amine-modified organoclays influenced by system pH and their potential to adsorb anionic herbicide', Geoderma, 436 (2023) [C1]
Organically modified montmorillonites have already attracted the attention of researchers due to their eco-friendly characteristics and versatile application in our daily lives. T... [more]
Organically modified montmorillonites have already attracted the attention of researchers due to their eco-friendly characteristics and versatile application in our daily lives. Their application is now being widely explored as a potential carrier for preparing solid-laden controlled release formulations (CRFs) of herbicides. The suitability of a new formulation mainly depends on herbicide releasing behaviour under various conditions, which is governed by the interaction mechanisms between carrier materials and target herbicide. The physicochemical properties of carriers and herbicides are the key components for establishing the probable interaction mechanisms between them. The physicochemical properties of amine-modified organoclays are mostly pH dependent and this experiment investigated the effect of pH on surface chemistry and how it changes when system pH is varied. Results revealed that the organoclays converted from protonated to deprotonated conditions as well as from hydrophobic to hydrophilic states with increasing system pH, from acidic to alkaline conditions. The release of surfactants from the organoclays was higher in acidic and alkaline pH conditions than in neutral pH. The release of major structural elements was highest in acidic conditions, but gradually abated with increasing system pH until neutral conditions were achieved. After that they increased slightly to an alkaline state, except for iron (Fe). Zeta values of both organoclays gradually diminished as system pH increased. The surface area of organoclays was highest at neutral pH, and gradually waned towards acidic and alkaline pH. This ultimately affects adsorption of anionic herbicide onto the various pH-adjusted organoclays. The adsorption was highest at around the pKa value of the herbicide and gradually declined with increasing system pH to a neutral state, and then slightly increased towards a higher pH. Based on this, it can be concluded that system pH exerts a significant influence on the physicochemical properties of amine-modified organoclays. This may affect firstly, adsorption of pesticides onto the interlayer gallery of the organoclays for CRFs of pesticides; and secondly, the formulation's releasing behaviour and ultimate efficacy of the synthesised formulation.
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Wang W, Gao Y, Du J, Zheng L, Kong X, Wang H, et al., 'Dose effect of nitrogen regulation on the bioremediation of diesel contaminated soil', Environmental Technology and Innovation, 32 (2023) [C1]
Nitrogen regulation is an effective method to enhance the bioremediation of hydrocarbon contamination. In this study, various dosages of two types of nitrogen sources were spiked ... [more]
Nitrogen regulation is an effective method to enhance the bioremediation of hydrocarbon contamination. In this study, various dosages of two types of nitrogen sources were spiked to the diesel contaminated soil in a 60-day microcosmic experiment. The results showed that the total petroleum hydrocarbon (TPH) degradation rate improved from control test of 32.03% to the highest of 44.74% with nitrogen spiking. Peptone and KNO3 significantly improved the bioremediation of diesel-contaminated soil, peptone was more effective than KNO3 at low dosage. The soil C:N ratio of 20:1 (T1 treatment with the addition of peptone) was the optimal treatment. The effect of two nitrogen on soil pH was reverse, high dose of peptone addition significantly increased soil pH, but KNO3 addition significantly decreased soil pH. The soil bacteria diversity decreased significantly in the high dose Peptone treated soil, while the changes of bacteria diversity of KNO3 treated soil was just opposite. Furthermore, nitrogen regulation significantly changed the structure of soil bacterial community, Rubrobacter, Solirubrobacter and Gaiella, which belonging to Actinomycetota, were identified as the three common genus with hydrocarbon degrading ability in different nitrogen amended soil. Peptone and KNO3 had different mechanisms on the bioremediation of diesel contaminated soil. The properties of these two nitrogen sources provides us with more options for the bioremediation of hydrocarbon contaminated acid or alkaline soil.
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2023 |
Luo Y, Khoshyan A, Al Amin M, Nolan A, Robinson F, Fenstermacher J, et al., 'Ultrasound-enhanced Magnéli phase Ti
Per-and polyfluoroalkyl substances (PFAS) remediation is still a challenge. In this study, we propose a hybrid system that combines electrochemical treatment with ultrasound irrad... [more]
Per-and polyfluoroalkyl substances (PFAS) remediation is still a challenge. In this study, we propose a hybrid system that combines electrochemical treatment with ultrasound irradiation, aiming for an enhanced degradation of PFAS. Equipped with a titanium suboxide (Ti4O7) anode, the electrochemical cell is able to remove perfluorooctanoic acid (PFOA) effectively. Under the optimal conditions (50 mA/cm2 current density, 0.15 M Na2SO4 supporting electrolyte, and stainless steel/Ti4O7/stainless steel electrode configuration with a gap of ~10 mm), the electrochemical process achieves ~100 % PFOA removal and 43 % defluorination after 6 h. Applying ultrasound irradiation (130 kHz) alone offers a limited PFOA removal, with 33 % PFOA removal and 5.5 % defluorination. When the electrochemical process is combined with ultrasound irradiation, we observe a significant improvement in the remediation performance, with ~100 % PFOA removal and 63.5 % defluorination, higher than the sum of 48.5 % (43 % achieved by the electrochemical process, plus 5.5 % by the ultrasound irradiation), implying synergistic removal/oxidation effects. The hybrid system also consistently shows the synergistic defluorination during degradation of other PFAS and the PFAS constituents in aqueous film forming foam (AFFF). We attribute the synergistic effect to an activated/cleaned electrode surface, improved mass transfer, and enhanced production of radicals.
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2023 |
Chen Y, Hassan M, Nuruzzaman M, Zhang H, Naidu R, Liu Y, Wang L, 'Iron-modified biochar derived from sugarcane bagasse for adequate removal of aqueous imidacloprid: sorption mechanism study', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 30 4754-4768 (2023) [C1]
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Fang C, Gopalan S, Yu J, Naidu R, 'Unveiling microplastics from zippers: Characterisation and visualisation through Raman imaging analysis.', Sci Total Environ, 904 166235 (2023) [C1]
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2023 |
Hasnain MG, Garcia-Esperon C, Tomari YK, Walker R, Saluja T, Rahman MM, et al., 'Effect of short-term exposure to air pollution on daily cardio- and cerebrovascular hospitalisations in areas with a low level of air pollution.', Environ Sci Pollut Res Int, 30 102438-102445 (2023) [C1]
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2023 |
Ogburn NJ, Duan L, Subashchandrabose SR, Sorgeloos P, O'Connor W, Megharaj M, Naidu R, 'Agricultural wastes for brine shrimp Artemia production: A review', Reviews in Aquaculture, 15 1159-1178 (2023) [C1]
An increasing global population has meant aquaculture, one of the fastest growing food industry sectors, faces significant sustainability challenges as it tries to address the ris... [more]
An increasing global population has meant aquaculture, one of the fastest growing food industry sectors, faces significant sustainability challenges as it tries to address the rising global protein demand. In many sectors, production is underpinned by fishmeal as dietary ingredient, but this is a finite resource with competing users from the poultry and livestock industries. Alternatively, some (planktonic) aquatic species, especially brine shrimp Artemia, can be produced using agricultural waste to provide food or biomass to support increasing aquaculture demand. This review investigates research and production of Artemia using agricultural waste. Various systems used for Artemia production in inoculated ponds are analysed and discussed to provide options for environmentally sustainable food systems that can be applied from either an artisanal level in developing countries with a considerable labour force, or in intensive systems in countries with large volumes of under-utilised resources, for example, sugar/alcohol-based waste and inland saline areas. Using agricultural waste, single cell protein production in a separate aerobic digester can be a simple, continuous food source for Artemia to enable daily biomass harvest. This could then be used as a fishmeal replacement or possibly for human consumption to promote a circular economy by remediating waste to produce protein, like a food production mine.
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Unnithan A, Bekele DN, Chadalavada S, Naidu R, 'Two-dimensional chlorinated vapour intrusion model involving advective transport of vapours with a highly permeable granular layer in the vadose zone serving as the preferential pathway.', Sci Total Environ, 869 161743 (2023) [C1]
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Bagherifam S, Brown TC, Naidu R, van Hullebusch ED, 'The effects of exogenous organic matter addition on bioaccessibility, adsorption kinetics and fractionation of antimony in soils', Water, Air, and Soil Pollution, 234 (2023) [C1]
Organic matter (OM) plays a pivotal role in adsorptive behavior, speciation, and bioavailability of nutrients and metal(loids) in soils. However, the effects of OM on adsorption, ... [more]
Organic matter (OM) plays a pivotal role in adsorptive behavior, speciation, and bioavailability of nutrients and metal(loids) in soils. However, the effects of OM on adsorption, fractionation, and bioavailability of antimony (Sb) in soils is largely unknown. In this study, the effects of two types of exogenous OM, including humic acid (HA) and fulvic acid (FA), on Sb bioavailability were compared in soils spiked with 1000 mg Sb kg-1 and incubated for 3 months under constant conditions. Treated soils were then subjected to single and sequential extractions using a Simplified Bioaccessibility Extraction Test (SBET) and BCR fractionation method as well as kinetic and desorption tests. Furthermore, SEM-EDX elemental maps of antimony were studies to better understand the distribution of antimony and its associations with soil elements. The kinetic data for amended and unamended soils fitted well with the pseudo-second order model, demonstrating that chemisorption might be the rate determining step. Bioaccessibility of antimony increased up to 65% in HA soils and OM additions increased acid-soluble fraction of Sb by approximately 40% (HA) and 75% (FA), compared to the control soils. OM amendments remarkably increased desorption of Sb from soils, whereas the maximum uptake capacity of Sb reduced in OM treated soils. The residual fraction accounted for 92% of total Sb in experimental soils, which was shifted to more labile fractions after OM amendments. The results of this research revealed that OM addition can greatly affect the bioaccessibility, distribution pattern and adsorption of Sb in Sb-impacted soils. Graphical abstract: [Figure not available: see fulltext.]
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2023 |
Umeh AC, Hassan M, Egbuatu M, Zeng Z, Al Amin M, Samarasinghe C, Naidu R, 'Multicomponent PFAS sorption and desorption in common commercial adsorbents: Kinetics, isotherm, adsorbent dose, pH, and index ion and ionic strength effects.', Sci Total Environ, 904 166568 (2023) [C1]
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2023 |
Fang C, Luo Y, Naidu R, 'Raman imaging for the analysis of silicone microplastics and nanoplastics released from a kitchen sealant', FRONTIERS IN CHEMISTRY, 11 (2023) [C1]
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2023 |
Fang C, Luo Y, Chuah C, Naidu R, 'Identification of microplastic fibres released from COVID-19 test swabs with Raman imaging', ENVIRONMENTAL SCIENCES EUROPE, 35 (2023) [C1]
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2023 |
Rahman MM, Rinklebe J, Naidu R, 'Arsenic speciation as well as toxic and nutrient elements in pantavat (overnight steeped rice).', Environ Pollut, 331 121901 (2023) [C1]
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2023 |
Luo Y, Naidu R, Fang C, 'Raman imaging to capture microplastics and nanoplastics carried by smartphones.', Sci Total Environ, 864 160959 (2023) [C1]
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2023 |
Luo Y, Awoyemi OS, Gopalan S, Nolan A, Robinson F, Fenstermacher J, et al., 'Investigating the effect of polarity reversal of the applied current on electrochemical degradation of per-and polyfluoroalkyl substances', Journal of Cleaner Production, 433 139691-139691 (2023) [C1]
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2022 |
Natasha, Bibi I, Niazi NK, Shahid M, Ali F, Masood ul Hasan I, et al., 'Distribution and ecological risk assessment of trace elements in the paddy soil-rice ecosystem of Punjab, Pakistan', Environmental Pollution, 307 (2022) [C1]
Trace elements (TEs) contamination of agricultural soils requires suitable criteria for regulating their toxicity limits in soil and food crops, which depends on their potential e... [more]
Trace elements (TEs) contamination of agricultural soils requires suitable criteria for regulating their toxicity limits in soil and food crops, which depends on their potential ecological risk spanning regional to global scales. However, no comprehensive study is available that links TE concentrations in paddy soil with ecological and human health risks in less developed regions like Pakistan. Here we evaluated the data set to establish standard guidelines for defining the hazard levels of various potentially toxic TEs (such as As, Cd, Co, Cu, Cr, Fe, Mn, Ni, Pb, Se, Zn) in agricultural paddy soils of Punjab, Pakistan. In total, 100 topsoils (at 0¿15 cm depth) and 204 rice plant (shoot and grain) samples were collected from five ecological zones of Punjab (Gujranwala, Hafizabad, Vehari, Mailsi, and Burewala), representing the major rice growing regions in Pakistan. The degree of contamination (Cd) and potential ecological risk index (PERI) established from ecological risk models were substantially higher in 100% and 97% of samples, respectively. The positive matrix factorization (PMF) model revealed that the elevated TEs concentration, notably Cd, As, Cr, Ni, and Pb, in the agricultural paddy soil was attributed to the anthropogenic activities and groundwater irrigation. Moreover, the concentration of these TEs in rice grains was higher than the FAO/WHO's safe limits. This study provided a baseline, albeit critical knowledge, on the impact of TE-allied ecological and human health risks in the paddy soil-rice system in Pakistan; and it opens new avenues for setting TEs guidelines in agro-ecological zones globally, especially in underdeveloped regions.
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2022 |
Xue Y, Wang Z, Naidu R, Bush R, Yang F, Liu J, Huang M, 'Role of halide ions on organic pollutants degradation by peroxygens-based advanced oxidation processes: A critical review', Chemical Engineering Journal, 433 (2022) [C1]
Halide ions are common in wastewater but their roles in advanced oxidation processes (AOPs) and the degradation of pollutants are reportedly highly variable. This review seeks to ... [more]
Halide ions are common in wastewater but their roles in advanced oxidation processes (AOPs) and the degradation of pollutants are reportedly highly variable. This review seeks to reconcile conflicting data on the degradation of pollutants in the presence of halides by peroxygens-based AOPs reported in the literatures: peroxymonosulfate (PMS)-, peroxydisulfate (PDS)-, and hydrogen peroxide (H2O2)-based AOPs, and electrochemical advanced oxidation processes (EAOPs). Seven common substituent groups on the aromatic ring (i.e., hydroxy groups (¿OH), amino groups (¿NH2), alkyl groups (¿R), olefinic compounds, carboxyl groups(¿COOH), nitro groups (¿NO2), halogens (¿X)) are considered, and halide ions were found to affect contaminants¿ degradation in all cases, either negatively or positively. The key influencing factors such as substrate properties and operating parameters (e.g., halides dosage, ionic strength, pH, and activation method) are examined. Each individual variable may affect degradation rates, but many of these effects are a combination of these variables in experimental or natural systems. Thus, the research work on the effect of halides on the simultaneous removal of more organics is needed. This present study details the unresolved challenges to provide a path for engineering challenges on AOPs. According to the factors affecting the performance of halides during decontamination processes, better AOP technologies should be selected to diminish adverse effects and take advantage of positive effects to deal with target pollutants in the saline environment, so as to achieve the purpose of reducing the operating costs and emission reduction.
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2022 |
Khan AUH, Naidu R, Dharmarajan R, Fang C, Shon H, Dong Z, Liu Y, 'The interaction mechanisms of co-existing polybrominated diphenyl ethers and engineered nanoparticles in environmental waters: A critical review', JOURNAL OF ENVIRONMENTAL SCIENCES, 124 227-252 (2022) [C1]
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2022 |
Asadi P, Alaie E, Heidari A, Naidu R, 'Photodegradation of modified petroleum impregnated bentonite mulch under the effects of solar radiation simulating the outdoor condition.', Environ Sci Pollut Res Int, 29 14754-14766 (2022) [C1]
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2022 |
Dadkhah-Aghdash H, Zare-Maivan H, Heydari M, Sharifi M, Lucas-Borja ME, Naidu R, 'Air pollution from gas refinery through contamination with various elements disrupts semiarid Zagros oak (Quercus brantii Lindl.) forests, Iran.', Sci Rep, 12 284 (2022) [C1]
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2022 |
Kulathunga MRDL, Wijayawardena MAA, Naidu R, 'Dietary heavy metal(loid)s exposure and prevalence of chronic kidney disease of unknown aetiology (CKDu) in Sri Lanka', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 44 3863-3874 (2022) [C1]
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2022 |
Luo Y, Zhang X, Zhang Z, Naidu R, Fang C, 'Dual-Principal Component Analysis of the Raman Spectrum Matrix to Automatically Identify and Visualize Microplastics and Nanoplastics', ANALYTICAL CHEMISTRY, 94 3150-3157 (2022) [C1]
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2022 |
Luo Y, Zhang Z, Naidu R, Zhang X, Fang C, 'Raman imaging of microplastics and nanoplastics released from the printed toner powders burned by a mimicked bushfire', Science of the Total Environment, 849 (2022) [C1]
Plastic contamination is a growing global concern, but the characterisation approaches for microplastics are limited so far, and even more lacking for nanoplastics. As another pub... [more]
Plastic contamination is a growing global concern, but the characterisation approaches for microplastics are limited so far, and even more lacking for nanoplastics. As another public concern, bushfire has the potential to exacerbate the negative ecological effects of plastic waste. We thus study the release of microplastics and nanoplastics from toner powers printed on a paper sheet following a mimicked bushfire. The results show that, along the fire frontier, there is a charred area first, then a cindered area towards mineralisation via a full combustion. We find that, depending on the extent of burning, the printed toner powers containing microplastics can melt to aggregate, or crack to break down to nanoplastics, which are well characterised by mass spectrometry and Raman imaging combined with algorithms. Overall, the results shed new light on the microplastics and nanoplastics once affected by bushfire.
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2022 |
Luo Y, Gibson CT, Chuah C, Tang Y, Naidu R, Fang C, 'Raman imaging for the identification of Teflon microplastics and nanoplastics released from non-stick cookware.', Science of the Total Environment, 851 (2022) [C1]
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2022 |
Luo Y, Al Amin M, Gibson CT, Chuah C, Tang Y, Naidu R, Fang C, 'Raman imaging of microplastics and nanoplastics generated by cutting PVC pipe', ENVIRONMENTAL POLLUTION, 298 (2022) [C1]
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2022 |
Luo Y, Gibson CT, Chuah C, Tang Y, Ruan Y, Naidu R, Fang C, 'Fire releases micro- and nanoplastics: Raman imaging on burned disposable gloves', Environmental Pollution, 312 (2022) [C1]
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2022 |
Luo Y, Gibson CT, Chuah C, Tang Y, Naidu R, Fang C, 'Applying Raman imaging to capture and identify microplastics and nanoplastics in the garden', JOURNAL OF HAZARDOUS MATERIALS, 426 (2022) [C1]
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2022 |
Luo Y, Chuah C, Al Amin M, Khoshyan A, Gibson CT, Tang Y, et al., 'Assessment of microplastics and nanoplastics released from a chopping board using Raman imaging in combination with three algorithms', JOURNAL OF HAZARDOUS MATERIALS, 431 (2022) [C1]
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2022 |
Luo Y, Naidu R, Zhang X, Fang C, 'Microplastics and nanoplastics released from a PPE mask under a simulated bushfire condition', Journal of Hazardous Materials, 439 (2022) [C1]
Due to COVID-19, large amounts of personal protective equipment (PPE) have been used, and many PPE units are made of plastics, such as face masks. The masks can be burned naturall... [more]
Due to COVID-19, large amounts of personal protective equipment (PPE) have been used, and many PPE units are made of plastics, such as face masks. The masks can be burned naturally in a bushfire or artificially at the incineration plants, and release microplastics and nanoplastics from the mask plastic fibres. A fire can cause the plastic, such as polypropylene (PP) fibres, to be molten and stick to the solid surface, such as glass, soil, concrete or plant, as films or islands, due to the binding property of the molten plastic material. Once the films or islands are peeled off in the processes such as weathering, ageing, or treatment and clean-up, there are residuals leftover, which are identified as nanoplastics and microplastics via Raman imaging, with the significant release amount of ~1100 nanoplastics / 10 µm2 or ~11 billion / cm2, and ~50 microplastics / 420 µm2 or ~12 million / cm2. Moreover, surface group is deviated on the plastic surface, which can also be distinguished and visualised as well via Raman imaging, down to nano size. This test validates the Raman imaging approach to capture microplastics and nanoplastics, and also provides important information about the fate and transportation of PPE mask in the environment, particularly when subjected to a fire. Overall, Raman imaging can be an effective option to characterise the microplastics and nanoplastics, along with the deviated surface group.
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Sobhani Z, Luo Y, Gibson CT, Tang Y, Naidu R, Fang C, 'Collecting microplastics in gardens: Case study (ii) from ropes', ENVIRONMENTAL TECHNOLOGY & INNOVATION, 26 (2022) [C1]
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2022 |
Campbell J, Clewell H, Cox T, Dourson M, Ethridge S, Forsberg N, et al., 'The Conundrum of the PFOA human half-life, an international collaboration', Regulatory Toxicology and Pharmacology, 132 (2022) [C1]
The Steering Committee of the Alliance for Risk Assessment (ARA) opened a call for scientists interested in resolving what appeared to be a conundrum in estimating of the half-lif... [more]
The Steering Committee of the Alliance for Risk Assessment (ARA) opened a call for scientists interested in resolving what appeared to be a conundrum in estimating of the half-life of perfluorooctanoate (PFOA) in humans. An Advisory Committee was formed from nominations received and a subsequent invitation led to the development of three small independent working groups to review appropriate information and attempt a resolution. Initial findings were shared among these groups and a conclusion developed from the ensuing discussions. Many human observational studies have estimated the PFOA half-life. Most of these studies note the likely occurrence of unmonitored PFOA exposures, which could inflate values of the estimated PFOA half-life. Also, few of these studies estimated the half-life of PFOA isomers, the branched chains of which likely have shorter half-lives. This could deflate values of the estimated linear PFOA half-life. Fortunately, several studies informed both of these potential problems. The majority opinion of this international collaboration is that the studies striking the best balance in addressing some of these uncertainties indicate the likely central tendency of the human PFOA half-life is less than 2 years. The single best value appears to be the geometric mean (GM) of 1.3 years (Zhang et al., 2013, Table 3), based on a GM = 1.7 years in young females (n = 20) and GM = 1.2 years in males of all ages and older females (n = 66). However, a combined median value from Zhang et al. (2013) of 1.8 years also adds value to this range of central tendency. While the Collaboration found this study to be the least encumbered with unmonitored PFOA exposures and branched isomers, more studies of similar design would be valuable. Also valuable would be clarification around background exposures in other existing studies in case adjustments to half-life estimates are attempted.
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2022 |
Fan X, Tang S, Wang Y, Fan W, Ben Y, Naidu R, Dong Z, 'Global Exposure to Per- and Polyfluoroalkyl Substances and Associated Burden of Low Birthweight.', Environ Sci Technol, 56 4282-4294 (2022) [C1]
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2022 |
Campbell J, Clewell H, Cox T, Dourson M, Ethridge S, Forsberg N, et al., 'Response to letter to editor "letter to the editors regarding "the Conundrum of the PFOA human half-life, an international collaboration"', REGULATORY TOXICOLOGY AND PHARMACOLOGY, 134 (2022)
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2022 |
Deb AK, Biswas B, Naidu R, Rahman MM, 'Mechanistic insights of hexavalent chromium remediation by halloysite-supported copper nanoclusters', Journal of Hazardous Materials, 421 (2022) [C1]
Chromium (Cr) pollution is a significant environmental concern with remediation challenge. Hexavalent chromium (Cr(VI)) is more toxic than trivalent chromium (Cr(III)) due to its ... [more]
Chromium (Cr) pollution is a significant environmental concern with remediation challenge. Hexavalent chromium (Cr(VI)) is more toxic than trivalent chromium (Cr(III)) due to its mutagenicity and oncogenicity. In this investigation, a multi-functional material, copper nanoclusters (CuNCs)-halloysite nanotubes (HNT) composite (CuNCs@HNT), has been synthesised in an eco-friendly manner and utilised for Cr(VI) remediation. Advanced analytical tools confirmed the seeding of ultra-fine CuNCs onto HNT surfaces. The maximum adsorption capacity of CuNCs@HNT is 79.14 ± 6.99 mg/g at pH 5 ± 0.1 with an increment at lower pHs. This performance was comparable for real surface stream water as well as other reported materials. The pseudo-second-order kinetic-, intra-particle diffusion- and Freundlich isotherm models well fit the experimental data implying that the chemisorption, multiphase diffusion and multi-molecular layer distribution occurred during adsorption. The Fourier-transform infrared and the x-ray photoelectron spectra also ensured the transformation of Cr(VI) to Cr(III) indicating the material's suitability for concurrent adsorption and reduction of Cr(VI). While coexisting cations and anions did not overwhelm this adsorption, CuNCs@HNT was regenerated and reused five successive times in adsorption-desorption cycles without significant loss of adsorption capacity and material's integrity. Therefore, this multi-functional, biocompatible, low-cost and stable CuNCs@HNT composite may have practical application for similar toxic metals remediation.
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Kulathunga MRDL, Wijayawardena MAA, Naidu R, Wimalawansa SJ, Rahman MM, 'Health risk assessment from heavy metals derived from drinking water and rice, and correlation with CKDu', Frontiers in Water, 3 (2022) [C1]
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Logeshwaran P, Subashchandrabose SR, Krishnan K, Sivaram AK, Annamalai P, Naidu R, Megharaj M, 'Polycyclic aromatic hydrocarbons biodegradation by fenamiphos degrading Microbacterium esteraromaticum MM1', Environmental Technology and Innovation, 27 (2022) [C1]
A Gram-positive bacterium, Microbacterium esteraromaticum MM1 able to degrade organophosphorus pesticides such as fenamiphos and malathion, also possessed the ability to degrade h... [more]
A Gram-positive bacterium, Microbacterium esteraromaticum MM1 able to degrade organophosphorus pesticides such as fenamiphos and malathion, also possessed the ability to degrade high molecular weight polycyclic aromatic hydrocarbon (PAH), pyrene (Pyr) and benzo[a]pyrene (BaP). The strain MM1 degraded 98.7% of initially spiked 100 mg L-1 pyrene within 15 days from the M9 mineral salts medium (pH 7.0) with 0.1% glucose. At optimal pH 7.0, 57.81% of pyrene (100 mg L-1) was degraded as the sole carbon source. In order to determine the influence of carbon sources (glucose, sodium acetate, sodium succinate) and PAHs (Naphthalene (Nap), Phenanthrene (Phe), Benzo[a]pyrene (BaP)) on pyrene degradation, a full factorial design analysis was conducted. Among the carbon sources examined, glucose, sodium acetate, and all the PAHs positively affected pyrene degradation. Interestingly, in the presence of other PAHs, benzo[a]pyrene was degraded by MM1 but not as the sole carbon source. Crude enzyme extracted from MM1 degraded pyrene with the Km and Vmax values of 49.3 µg ml-1 (equivalent to 250 µM) and 9.5 µg ml-1 min-1 mg-1 of crude protein (equivalent to 50 µM), respectively with a specific activity of 0.19 µg ml-1 mg-1 of crude protein. Metabolites such as monohydroxypyrene, 2,6-di-isopropylnaphthalene, and phthalic acid were identified during pyrene degradation by MM1. Differential expression of the protein in the presence of pyrene resulted in the inducement of enolase (phosphopyruvate hydratase) and pyridine nucleotide-disulphide oxidoreductase in MM1. To the best of our knowledge, this is the first report on the degradation of pyrene by M. esteraromaticum MM1.
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Zhang D, Yan K, Liu Y, Naidu R, 'Effects of Phosphate, Red Mud, and Biochar on As, Cd, and Cu Immobilization and Enzymatic Activity in a Co-Contaminated Soil', PROCESSES, 10 (2022) [C1]
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2022 |
Perera IA, Abinandan S, Panneerselvan L, Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Co-culturing of microalgae and bacteria in real wastewaters alters indigenous bacterial communities enhancing effluent bioremediation', ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS, 64 (2022) [C1]
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2022 |
Rusmin R, Sarkar B, Mukhopadhyay R, Tsuzuki T, Liu Y, Naidu R, 'Facile one pot preparation of magnetic chitosan-palygorskite nanocomposite for efficient removal of lead from water', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 608 575-587 (2022) [C1]
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2022 |
Gao Y, Yuan L, Du J, Wang H, Yang X, Duan L, et al., 'Bacterial community profile of the crude oil-contaminated saline soil in the Yellow River Delta Natural Reserve, China', Chemosphere, 289 (2022) [C1]
Crude oil contamination greatly influence soil bacterial community. Proliferative microbes in the crude oil-contaminated soil are closely related to the living conditions. Oil wel... [more]
Crude oil contamination greatly influence soil bacterial community. Proliferative microbes in the crude oil-contaminated soil are closely related to the living conditions. Oil wells in the Yellow River Delta Natural Reserve (YRDNR) region is an ideal site for investigating the bacterial community of crude oil-contaminated saline soil. In the present study, 18 soil samples were collected from the depths of 0¿20 cm and 20¿40 cm around the oil wells in the YRDNR. The bacterial community profile was analyzed through high-throughput sequencing to trace the oil-degrading aerobic and anaerobic bacteria. The results indicated that C15¿C28 and C29¿C38 were the main fractions of total petroleum hydrocarbon (TPH) in the sampled soil. These TPH fractions had a significant negative effect on bacterial biodiversity (Shannon, Simpson, and Chao1 indices), which led to the proliferation of hydrocarbon-degrading bacteria. A comprehensive analysis between the environmental factors and soil microbial community structure showed that Streptococcus, Bacillus, Sphingomonas, and Arthrobacter were the aerobic hydrocarbon-degrading bacteria; unidentified Rhodobacteraceae and Porticoccus were considered to be the possible facultative anaerobic bacteria with hydrocarbon biodegradation ability; Acidithiobacillus, SAR324 clade, and Nitrosarchaeum were predicted to be the anaerobic hydrocarbon-degrading bacteria in the sub-surface soil. Furthermore, large amount of carbon sources derived from TPH was found to cause depletion of bioavailable nitrogen in the soil. The bacteria associated with nitrogen transformation, such as Solirubrobacter, Candidatus Udaeobacter, Lysinibacillus, Bradyrhizobium, Sphingomonas, Mycobacterium, and Acidithiobacillus, were highly abundant; these bacteria may possess the ability to increase nitrogen availability in the crude oil-contaminated soil. The bacterial community functions were significantly different between the surface and the sub-surface soil, and the dissolved oxygen concentration in soil was considered to be potential influencing factor. Our results could provide useful information for the bioremediation of crude oil-contaminated saline soil.
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Siddique AB, Rahman MM, Islam MR, Naidu R, 'Influences of soil pH, iron application and rice variety on cadmium distribution in rice plant tissues', Science of the Total Environment, 810 (2022) [C1]
Cadmium (Cd) is a widespread environmental contaminant, and its increasing concentrations in rice poses significant risks to human health. Globally, rice is a staple food for mill... [more]
Cadmium (Cd) is a widespread environmental contaminant, and its increasing concentrations in rice poses significant risks to human health. Globally, rice is a staple food for millions of people, and consequently, effective strategies to reduce Cd accumulation in rice are needed. This study investigates the effect of soil pH (Soil 1: 4.6; Soil 2: 6.6) and iron (Fe) application (at 0, 1.0 and 2.0 g/kg) on Fe plaque formation, Cd sequestration in Fe plaques and Cd bioaccumulation in different parts of the rice plant for three different Cd-graded paddy soils (0, 1.0 and 3.0 mg/kg, respectively) using two Australian rice cultivars under glasshouse conditions. Results show that grain and straw yield declined as Cd toxicity increased, and the toxic effects of Cd were lower in the Quest cultivar than in the Langi cultivar. With applications of Cd at 1.0 mg/kg and 3.0 mg/kg, Cd concentrations in rice grown in Soil 1 were 1.09 mg/kg and 1.37 mg/kg, respectively, while those in rice grown in Soil 2 were 0.38 mg/kg and 0.52 mg/kg, respectively. Soil pH significantly affected the bioaccumulation of Cd in different parts of the rice plant. At both levels of Cd application, Cd concentration was highest in the root, followed by the stem, leaf, husk and grain. Cd was more concentrated in Fe plaques formed by the application of Fe than in rice plant tissues. The Quest cultivar had a higher ability to produce Fe plaques and a 1.3- and 1.4-times higher Cd concentration compared with the Langi cultivar in Soils 1 and 2, respectively.
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Luo Y, Sobhani Z, Zhang Z, Zhang X, Gibson CT, Naidu R, Fang C, 'Raman imaging and MALDI-MS towards identification of microplastics generated when using stationery markers', Journal of Hazardous Materials, 424 (2022) [C1]
The characterisation of microplastics is still a challenge, particularly when the sample is a mixture with a complex background, such as an ink mark on paper. To address this chal... [more]
The characterisation of microplastics is still a challenge, particularly when the sample is a mixture with a complex background, such as an ink mark on paper. To address this challenge, we developed and compared two approaches, (i) Raman imaging, combined with logic-based and principal component analysis (PCA)-based algorithms, and (ii) matrix-assisted laser desorption/ionisation-mass spectrometry (MALDI-MS). We found that, accordingly, (i) if the Raman signal of plastics is identifiable and not completely shielded by the background, Raman imaging can extract the plastic signals and visualise their distribution directly, with the help of a logic-based or PCA-based algorithm, via the ¿fingerprint¿ spectrum; (ii) when the Raman signal is shielded and masked by the background, MALDI-MS can effectively capture and identify the plastic polymer, via the ¿barcode¿ of the mass spectrum linked with the monomer. Overall, both Raman imaging and MALDI-MS have benefits and limitations for microplastic analysis; if accessible, the combined use of these two techniques is generally recommended, especially when assessing samples with strong background interference.
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Shehzad MT, Sabir M, Saifullah, Siddique AB, Rahman MM, Naidu R, 'Impact of Water Regimes on Minimizing the Accumulation of Arsenic in Rice (Oryza sativa L.)', WATER AIR AND SOIL POLLUTION, 233 (2022) [C1]
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Nuruzzaman M, Liu Y, Ren J, Rahman M, Zhang H, Johir MAH, et al., 'Capability of Organically Modified Montmorillonite Nanoclay as a Carrier for Imidacloprid Delivery', ACS Agricultural Science & Technology, 2 57-68 (2022) [C1]
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2022 |
Perera IA, Abinandan S, Subashchandrabose SR, Venkateswarlu K, Cole N, Naidu R, Megharaj M, 'Extracellular Polymeric Substances Drive Symbiotic Interactions in Bacterial Microalgal Consortia.', Microb Ecol, 83 596-607 (2022) [C1]
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2022 |
Wijayawardena M, Kulathunga MRDL, Naidu R, Wimalawansa SJ, 'Potential Link between Spatial Variation and Translocation characteristics of Heavy Metals in Paddy topsoil and Human health risks in a CKDu prevalent area of Sri Lanka', Weeds: Journal of the APWSS, 4 62-75 (2022) [C1]
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Haque S, Srivastava N, Pal DB, Alkhanani MF, Almalki AH, Areeshi MY, et al., 'Functional microbiome strategies for the bioremediation of petroleum-hydrocarbon and heavy metal contaminated soils: A review', SCIENCE OF THE TOTAL ENVIRONMENT, 833 (2022) [C1]
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2022 |
Shehzad MT, Sabir M, Zia-Ur-Rehman M, Zia MA, Naidu R, 'Arsenic concentrations in soil, water, and rice grains of rice-growing areas of Punjab, Pakistan: multivariate statistical analysis.', Environmental monitoring and assessment, 194 346 (2022) [C1]
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2022 |
Hamid Y, Liu L, Usman M, Naidu R, Haris M, Lin Q, et al., 'Functionalized biochars: Synthesis, characterization, and applications for removing trace elements from water.', Journal of hazardous materials, 437 129337 (2022) [C1]
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Perera IA, Abinandan S, Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Combined inorganic nitrogen sources influence the release of extracellular compounds that drive mutualistic interactions in microalgal-bacterial co-cultures', JOURNAL OF APPLIED PHYCOLOGY, 34 1311-1322 (2022) [C1]
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2022 |
Hai NNS, Sanderson P, Qi F, Du J, Nong NN, Bolan N, Naidu R, 'Effects of chelates (EDTA, EDDS, NTA) on phytoavailability of heavy metals (As, Cd, Cu, Pb, Zn) using ryegrass (Lolium multiflorum Lam.).', Environmental science and pollution research international, 29 42102-42116 (2022) [C1]
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2022 |
Grieco SA, Koenigsberg S, Claffey J, Cooper I, Dewitt A, Naidu R, Wymore R, 'Ex situ treatment and residual management of PFAS contaminated environmental media', REMEDIATION-THE JOURNAL OF ENVIRONMENTAL CLEANUP COSTS TECHNOLOGIES & TECHNIQUES, 32 55-63 (2022) [C1]
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Heikal YM, El-Esawi MA, Naidu R, Elshamy MM, 'Eco-biochemical responses, phytoremediation potential and molecular genetic analysis of Alhagi maurorum grown in metal-contaminated soils.', BMC plant biology, 22 383 (2022) [C1]
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2022 |
Saianand G, Gopalan A-I, Wanga L, Venkatramanan K, Roy VAL, Sonar P, et al., 'Conducting polymer based visible light photocatalytic composites for pollutant removal: Progress and prospects', ENVIRONMENTAL TECHNOLOGY & INNOVATION, 28 (2022) [C1]
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Perera IA, Abinandan S, Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Impact of Nitrate and Ammonium Concentrations on Co-Culturing of Tetradesmus obliquus IS2 with Variovorax paradoxus IS1 as Revealed by Phenotypic Responses', MICROBIAL ECOLOGY, 83 951-959 (2022) [C1]
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2022 |
Cheng F, Luo Y, Naidu R, 'Raman imaging combined with an improved PCA/algebra-based algorithm to capture microplastics and nanoplastics', ANALYST, 147 4301-4311 (2022) [C1]
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2022 |
Islam MR, Sanderson P, Payne TE, Deb AK, Naidu R, 'Role of beryllium in the environment: Insights from specific sorption and precipitation studies under different conditions.', The Science of the total environment, 838 155698 (2022) [C1]
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2022 |
Mehmood K, Bao Y, Saifullah W, Cheng W, Khan MA, Siddique N, et al., 'Predicting the quality of air with machine learning approaches: Current research priorities and future perspectives', JOURNAL OF CLEANER PRODUCTION, 379 (2022) [C1]
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2022 |
Bagherifam S, Brown TC, Fellows CM, Naidu R, Komarneni S, 'In situ stabilization of arsenic in soil with organoclay, organozeolite, birnessite, goethite and lanthanum-doped magnetic biochar', PEDOSPHERE, 32 764-776 (2022) [C1]
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2022 |
Bashir S, Awan MS, Farrukh MA, Naidu R, Khan SA, Rafique N, et al., 'In-vivo (
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2022 |
Rashid MH, Rahman MM, Naidu R, 'Zinc Biofortification through Basal Zinc Supply Reduces Grain Cadmium in Mung Beans: Metal Partitioning and Health Risks Assessment.', Toxics, 10 689 (2022) [C1]
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2022 |
Luo Y, Gibson CT, Tang Y, Naidu R, Fang C, 'Characterising microplastics in shower wastewater with Raman imaging', Science of the Total Environment, 811 (2022) [C1]
Microplastics can potentially be released in our daily activities, such as via our showers, as our clothes are made of plastic fibres, and/or cotton fibres. The challenge is how t... [more]
Microplastics can potentially be released in our daily activities, such as via our showers, as our clothes are made of plastic fibres, and/or cotton fibres. The challenge is how to characterise these microplastics in shower debris. Herewith we employ Raman imaging to directly visualise the microplastics collected from shower wastewater. Raman can map an image from the scanning array that contains a matrix of thousands of spectra, featuring a considerably higher signal-noise ratio than that from a single spectrum. The increased signal-noise ratio reduces the complexity of sample preparation. Consequently, after the shower debris was sampled and washed, Raman imaging allowed us to distinguish the microplastic fibres from the background including cotton fibres and dirt aggregates. Interestingly, by adjusting the laser power intensity, the scanning process enabled simultaneous in-situ bleaching of the colorants formulated in the textile fibres and collection of signals. The disadvantage of Raman imaging such as the short focusing/working distance is also presented and discussed. Overall, the Raman imaging can extract meaningful information from the complex shower debris samples to enable analysis of microplastics.
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2022 |
Nuruzzaman M, Liu Y, Ren J, Rahman M, Zhang H, Johir MAH, et al., 'Capability of Organically Modified Montmorillonite Nanoclay as a Carrier for Imidacloprid Delivery', ACS Agricultural Science & Technology, 2 57-68 (2022)
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2022 |
Deb AK, Biswas B, Rahman MM, Xi Y, Paul SK, Naidu R, 'Magnetite Nanoparticles Loaded into Halloysite Nanotubes for Arsenic(V) Removal from Water', ACS Applied Nano Materials, (2022) [C1]
Groundwater contaminated by arsenic (As) is a serious concern because it poses a significant threat to millions of people reliant on both drinking and irrigation of farms. Hence, ... [more]
Groundwater contaminated by arsenic (As) is a serious concern because it poses a significant threat to millions of people reliant on both drinking and irrigation of farms. Hence, the low-cost and efficient treatment of these waters is of utmost importance. This study presents the ecofriendly synthesis of magnetite nanoparticles (Fe3O4 NPs)-immobilized halloysite nanotube (HNT) composite (Fe3O4@HNT) for remediating arsenate [As(V)] from water. High-resolution transmission electron microscopy confirmed that ultrasmall Fe3O4 NPs (4.52 ± 1.63 nm) were immobilized on the interior surface of HNT. Fe3O4@HNT possesses a larger surface area (82 ± 0.23 m2/g) and a higher thermal stability (7.1% weight loss at 950 °C) than a pristine HNT (47.23 ± 0.14 m2/g and 12.6%, respectively). Adsorption kinetics were best fitted with pseudo-second-order and intraparticle diffusion, while the isotherms results were best supported with the Freundlich model (R2 = 0.99 in each case). Therefore, it could be surmised that multiphase rate-controlling chemisorption occurred during adsorption. The thermodynamics data revealed the endothermic nature of As(V) adsorption by Fe3O4@HNT. Fourier transform infrared and X-ray photelectron spectroscopy analyses confirmed chemical bonding between As and Fe. In addition, Fe3O4@HNT was easily separable by an external magnet (the saturation magnetization value was 20 emu/g), which is an additional benefit of the material to be used on an industrial scale. The material was also reusable after regeneration for five rounds of consecutive sorption-desorption with excellent efficiency and no substantial loss of structural integrity. Furthermore, Fe3O4@HNT removed more than 99% As(V) from the groundwater, signifying its viability in real-case implementation. Cost-benefit analysis ensured that Fe3O4@HNT was cost-effective, while its biocompatibility test confirmed no detrimental impact on soil bacterial growth once the spent material had been disposed. Consequently, cheap, easily separable, reusable, and biocompatible Fe3O4@HNT may be a prospective composite for the sustainable eradication of As and other metallic toxicants from wastewater.
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Liu Y, Bahar MM, Samarasinghe SVAC, Qi F, Carles S, Richmond WR, et al., 'Ecological risk assessment for perfluorohexanesulfonic acid (PFHxS) in soil using species sensitivity distribution (SSD) approach', Journal of Hazardous Materials, 439 (2022) [C1]
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Hassan M, Naidu R, Du J, Qi F, Ahsan MA, Liu Y, 'Magnetic responsive mesoporous alginate/beta-cyclodextrin polymer beads enhance selectivity and adsorption of heavy metal ions', INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, 207 826-840 (2022) [C1]
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Li J, Wang X, Yang J, Liu Y, Naidu R, 'Predicting the thresholds of metals with limited toxicity data with invertebrates in standard soils using quantitative ion character-activity relationships (QICAR)', Journal of Hazardous Materials, 423 (2022) [C1]
Terrestrial invertebrates are often used as indicator organisms in ecological risk assessments. However, determining the risk of metals to invertebrates is laborious and time-cons... [more]
Terrestrial invertebrates are often used as indicator organisms in ecological risk assessments. However, determining the risk of metals to invertebrates is laborious and time-consuming due to the lengthy testing and ethical approval procedures. In this study, a review of the literature was conducted to provide toxicity data for two standard soils (OECD and LUFA 2.2). An attempt was made to establish models for predicting the toxicity of elements to invertebrates using quantitative ion character-activity relationships (QICARs). In OECD soil, the element toxicity of four groups (Enchytraeus albidus mortality and reproduction, Folsomia candida and Eisenia fetida reproduction) showed significant correlations with atomic number, atomic mass and atomic ionization potential (0.852 = R2 = 0.989, P < 0.05). For LUFA 2.2 soil, polarization force parameters and boiling point were most significant parameters for toxicity values of F. candida and Enchytraeus crypticus, respectively (0.866 = R2 = 0.962, P < 0.05). Finally, QICAR models were established, and LC50 or EC50 of elements were predicted. Then, models were verified using standard and natural soils, and showed that errors between observed and predicted logLC50/EC50 were mostly < 0.5 orders of magnitude. Thus, the developed QICAR models have potential for predicting the toxicity of elements for soils.
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Bidast S, Golchin A, Baybordi A, Naidu R, 'Effects of Fe oxide-based nanoparticles on yield and nutrient content of corn in Cobalt-contaminated soils', Environmental Technology and Innovation, 26 (2022) [C1]
This study aimed to investigate the efficacy of Fe oxide nanoparticles (NPs) alleviating cobalt (Co) phytotoxicity in contaminated soils. The experiment was conducted in a greenho... [more]
This study aimed to investigate the efficacy of Fe oxide nanoparticles (NPs) alleviating cobalt (Co) phytotoxicity in contaminated soils. The experiment was conducted in a greenhouse involving Fe oxide NPs (carboxymethylcellulose (CMC)-stabilised and non-stabilised (pure) hematite, goethite, and magnetite) and concentrations of soil total Co (5, 25, 65, 125, and 185 mg kg -1). Corn plant was grown in the treated and untreated soil samples and harvested after 60 days. Results indicated that by increasing the concentration of Co in soil from 5 to 25 mg kg -1, the growth parameters and the concentrations of K, P, Fe, and Zn in the shoots of corn increased. However, in soil samples with total Co concentrations of 25 to 185 mg kg -1, the growth and concentrations of nutrients in plant aerial parts declined. At low concentrations of Co (5 and 25 mg kg -1 soil), the application of pure Fe oxide NPs and composites inhibited corn growth as well as concentrations of plant nutrients in the shoots. At high concentrations of Co in soil, the application of treatments, especially stabilised goethite, reduced the accumulation of Co in the corn plant and enhanced its growth by increasing the concentrations of nutrients in plant aerial parts. This study suggests that the efficacy of treatments in enhancing corn growth depends on the total Co concentration of soil.
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Yuan L, Gao Y, Cheng F, Du J, Hu Z, Yang X, et al., 'The influence of oil exploitation on the degradation of vegetation: A case study in the Yellow River Delta Nature Reserve, China', ENVIRONMENTAL TECHNOLOGY & INNOVATION, 28 (2022) [C1]
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2022 |
Hassan M, Du J, Liu Y, Naidu R, Zhang J, Ahsan MA, Qi F, 'Magnetic biochar for removal of perfluorooctane sulphonate (PFOS): Interfacial interaction and adsorption mechanism', ENVIRONMENTAL TECHNOLOGY & INNOVATION, 28 (2022) [C1]
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2022 |
Bidast S, Golchin A, Baybordi A, Mohseni A, Naidu R, 'Impact of bare and CMC-coated Fe oxide nanoparticles on microbial activity and immobilising zinc, lead, and cadmium in a contaminated soil', ARCHIVES OF AGRONOMY AND SOIL SCIENCE, (2022) [C1]
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2022 |
Bolan S, Seshadri B, Kunhikrishnan A, Grainge I, Talley NJ, Bolan N, Naidu R, 'Differential toxicity of potentially toxic elements to human gut microbes', CHEMOSPHERE, 303 (2022) [C1]
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2021 |
Halim MA, Rahman MM, Mondal D, Megharaj M, Naidu R, 'Bioaccumulation and Tolerance Indices of Cadmium in Wheat Plants Grown in Cadmium-Spiked Soil: Health Risk Assessment', Frontiers in Environmental Science, 9 (2021) [C1]
Farmers use wastewater for irrigation in many developing countries, for example Bangladesh, India, China, Sri Lanka and Vietnam because they have limited access to clean water. Th... [more]
Farmers use wastewater for irrigation in many developing countries, for example Bangladesh, India, China, Sri Lanka and Vietnam because they have limited access to clean water. This study explored cadmium (Cd) bioaccumulation in two spring wheat cultivars (cv. Mustang and Lancer), which were grown in different concentrations of Cd (0,1, 2, 4, and 8¿mg kg-1) in agricultural soils. The half maximum inhibitory concentration (IC50) values were 4.21 ± 0.29 and 4.02 ± 0.95, respectively, whereas the maximum health risk index (HRI) was 3.85 ± 0.049 and 5.33 ± 0.271, respectively, for Mustang and Lancer. In other words, the malondialdehyde content increased significantly in Mustang (around five-fold) and Lancer (around four-fold) compared with the control treatment. Results revealed that Cd content was well above the acceptable limit (HRI >1) in the two cultivars when exposed to different levels of Cd stress. The tolerant cultivar (Mustang) has potential to chelate Cd in the nonedible parts of plants in variable fractions and can be used efficiently to improve growth and macro- and micro-nutrients content while reducing Cd concentration in plants in Cd-contaminated soil. It can also diminish the HRI, which may help to protect humans from Cd risks. The two cultivars¿ nutrient availability and sorption capacity significantly shape their survival and adaptability under Cd stress. Based on what is documented in the current study, we can conclude that Mustang is more tolerant and poses fewer health hazards to people than Lancer because of its capacity to maintain grain macro- and micro-nutrients under Cd stress.
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2021 |
Rashid MH, Rahman MM, Halim MA, Naidu R, 'Growth, metal partitioning and antioxidant enzyme activities of mung beans as influenced by zinc oxide nanoparticles under cadmium stress', CROP & PASTURE SCIENCE, 73 862-876 (2021) [C1]
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2021 |
Wang L, Cheng Y, Naidu R, Chadalavada S, Bekele D, Gell P, et al., 'Application of portable gas chromatography mass spectrometer for rapid field based determination of TCE in soil vapour and groundwater', Environmental Technology and Innovation, 21 (2021) [C1]
The application of portable chromatography¿mass spectrometer (GC¿MS) is restrained by its detection limits without the development of proper sample pre-concentration methods. The ... [more]
The application of portable chromatography¿mass spectrometer (GC¿MS) is restrained by its detection limits without the development of proper sample pre-concentration methods. The primary focus of this paper is to introduce a practical field measurement methodology for the analysis of volatile organic compounds (VOCs) in soil vapour and groundwater using a portable gas (GC¿MS)system for application to in situ assessment of vapour intrusion from VOC contamination. A solid-phase micro-extraction (SPME) technique was applied for sample pre-concentration before the GC¿MS¿ measurement. Practical in-field soil gas SPME sampling methods have been developed to optimise the SPME extraction efficiency to then ultimately improve the detection limits of portable GC¿MS. An Australian site impacted by a chlorinated VOC, trichloroethylene (TCE), was the subject of the case study. To rapidly assess soil vapour samples in subsurface soil, in-house-developed retractable soil vapour sampling probes (SVSPs) were installed at the site in clusters at depths of 1 m, 2 m and 3 m below ground level at each sampling location. Use of the SVSPs for sampling enabled the generation of a three-dimensional map and distribution contours for TCE concentrations using the in situ measurement results of a portable GC¿MS analysis for vapour intrusion investigation. The results of the portable GC¿MS¿ analysis were compared with the results from conventional USEPA methods, such as TO-15 and Method 8265 for soil vapour and groundwater samples, respectively. This work demonstrates that the developed methodology of using a portable GC¿MS system has the capability for in-field quantitative analysis of VOCs for rapid contaminated site vapour intrusion assessment.
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Sobhani Z, Panneerselvan L, Fang C, Naidu R, Megharaj M, 'Chronic and Transgenerational Effects of Polystyrene Microplastics at Environmentally Relevant Concentrations in Earthworms (
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2021 |
Sobhani Z, Panneerselvan L, Fang C, Naidu R, Megharaj M, 'Chronic and transgenerational effects of polyethylene microplastics at environmentally relevant concentrations in earthworms', ENVIRONMENTAL TECHNOLOGY & INNOVATION, 25 (2021) [C1]
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Nova |
2021 |
Asadi P, Heidari A, Alaie E, Naidu R, Asadi H, Mahmoodi S, 'Use of modified and petroleum -impregnated bentonite mulch as an eco-friendly stabilizer of wind erodible sands', Aeolian Research, 53 (2021) [C1]
This study aimed to develop a method for the management of petroleum pollutants released into the environment using modified bentonite and to evaluate the use of petroleum-impregn... [more]
This study aimed to develop a method for the management of petroleum pollutants released into the environment using modified bentonite and to evaluate the use of petroleum-impregnated modified bentonite, as an eco-friendly and resistant mulch to stabilize mobile sands exposed to wind erosion. Bentonite was modified using hexa-decyl-tri-methyl-ammonium bromide to increase its capacity for petroleum adsorption. The resistivity to breakdown of the produced mulch was determined against wind, runoff, and by drainage water caused by simulated rainfall. Results showed that the basal spacing of the modified bentonite increased 162% compared to unmodified bentonite and it was able to adsorb petroleum, 5 times its base weight. The produced mulch was resistant against wind flows up to 16.7 m s-1 with no soil loss during 5 min, while the untreated sandy soil started to move at a threshold speed of 10.3 m s-1 (with a soil loss rate of 53 g m-2 s-1) and the tray of soil was fully eroded after 135 s. Analysis of the drainage waters which passed through the mulch showed that mulch 2 (ratio 5:1, sandy soil: modified clay + unmodified clay (1:1) mixed by petroleum) retained more polycyclic aromatic hydrocarbons compounds, compared to mulches 1 (ratio of 5:1 sandy soil: unmodified bentonite mixed with petroleum) and 3 (ratio 5:1:0.5, sandy soil: unmodified clay: modified clay mixed by petroleum). Analysis of the runoff water samples also showed that PAHs retention in mulch 2 is significantly higher than the amounts retained by mulches 1 and 3.
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Nova |
2021 |
Siddique AB, Rahman MM, Islam MR, Shehzad MT, Nath B, Naidu R, 'Influence of iron plaque on accumulation and translocation of cadmium by rice seedlings', Sustainability (Switzerland), 13 (2021) [C1]
This study investigated the impact of soil type and rice cultivars on variations in the iron plaque formation and cadmium (Cd) accumulation by different portions of rice seedlings... [more]
This study investigated the impact of soil type and rice cultivars on variations in the iron plaque formation and cadmium (Cd) accumulation by different portions of rice seedlings under the influence of Fe amendment. The experiments were performed in pots under glasshouse conditions using two typical paddy soils. Rice seedlings were exposed to three concentrations of Cd (0, 1 and 3 mg kg-1 soil) and Fe (0, 1.0 and 2.0 g kg-1 soil). The results revealed that shoot biomass decreased by 12.2¿23.2% in Quest and 12.8¿30.8% in Langi in the Cd1.0 and Cd3.0 treatments, while shoot biomass increased by 11.2¿19.5% in Quest and 26¿43.3% in Langi in Fe1.0 and Fe2.0 as compared to the Fe control. The Cd concentration in the roots and shoots of rice seedlings were in the order of Langi cultivar > Quest cultivar, but the Fe concentration in rice tissues showed the reverse order. Fe plaque formations were promoted by Fe application, which was 7.8 and 10.4 times higher at 1 and 2 g kg-1 Fe applications compared to the control Fe treatment. The Quest cultivar exhibited 13% higher iron plaque formation capacity compared to the Langi cultivar in both soil types. These results indicate that enhanced iron plaque formation on the root surface was crucial to reduce the Cd concentration in rice plants, which could be an effective strategy to regulate grain Cd accumulation in rice plants.
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Nova |
2021 |
Deb AK, Biswas B, Goswami N, Hilder EF, Naidu R, Rahman MM, 'Synthesis of environmentally benign ultra-small copper nanoclusters-halloysite composites and their catalytic performance on contrasting azo dyes', Applied Surface Science, 546 (2021) [C1]
Supported metal nanoclusters (NCs) are an ideal catalytic system from their ultra-small size (<3 nm), reactivity and confinement on support materials. Whether synthesis of such... [more]
Supported metal nanoclusters (NCs) are an ideal catalytic system from their ultra-small size (<3 nm), reactivity and confinement on support materials. Whether synthesis of such composite is feasible using copper (Cu) as catalyst on nontoxic and inexpensive support material but without using any toxic reducing agent is yet to be explored. Here, synthesis of CuNCs using only biocompatible glutathione and localised them on halloysite nanotubes (HNTs) would be a sustainable catalyst composite. Following hydrothermal reaction, composites CuNCs@HNT and CuNCs@HNT-PS were synthesised by one-step and post-synthesis methods, respectively. State-of-the-art tools, including high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy revealed NCs formation, chemical states, and confinement and stability as composite, while catalysis reaction was monitored by spectrophotometer. Both composites exhibited faster catalytic performance than did bare NCs for the degradation of contrasting model azo dyes, methylene blue (MB) and methyl orange (MO). CuNCs, CuNCs@HNT and CuNCs@HNT-PS required only 93 ± 1.0, 17.5 ± 2.5 and 27 ± 2.5 s, respectively for 100% degradation of MB whereas >90% degradation of MO occurred by 120 ± 5.21, 75 ± 3.15 and 90 ± 3.61 min, respectively. Composites showed excellent catalytic reusability and environmental nontoxicity. Therefore, as effective and safe catalysts, they can shed light on exploring further usage in the environment and industrial set-ups.
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Nova |
2021 |
Logeshwaran P, Sivaram AK, Surapaneni A, Kannan K, Naidu R, Megharaj M, 'Exposure to perfluorooctanesulfonate (PFOS) but not perflurorooctanoic acid (PFOA) at ppb concentration induces chronic toxicity in Daphnia carinata', Science of the Total Environment, 769 (2021) [C1]
Widespread environmental contamination of per- and polyfluoroalkyl substances (PFAS) is well established. Nevertheless, few studies have reported on the aquatic toxicity of PFAS, ... [more]
Widespread environmental contamination of per- and polyfluoroalkyl substances (PFAS) is well established. Nevertheless, few studies have reported on the aquatic toxicity of PFAS, especially in indicator species such as Daphnia. In this study, the toxicity of two major PFAS, namely perfluorooctanoic acid (PFOA) and perfluorooctanesulfonate (PFOS), was investigated on water flea (Daphnia carinata) using a battery of comprehensive toxicity tests, including a 48 h acute and a 21-day chronic assays. The survival, growth, and reproduction of D. carinata were monitored over a 21-day life cycle. PFOS exhibited higher toxicity than PFOA. The 48 h LC50 values (confidence interval) based on acute toxicity for PFOA and PFOS were 78.2 (54.9¿105) mg L-1 and 8.8 (6.4¿11.6) mg L-1, respectively. Chronic exposure to PFOS for 21 days displayed mortality and reproductive defects in D. carinata at a concentration as low as 0.001 mg L-1. Genotoxicity assessment using comet assay revealed that exposure for 96 h to PFOS at 1 and 10.0 mg L-1 significantly damaged the organism's genetic makeup. The results of this study have great implications for risk assessment of PFOS and PFOA in aquatic ecosystems, given the potential of PFOS to pose a risk to Daphnia even at lower concentrations (1 µg L-1).
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Nova |
2021 |
Li BT, Zhou ZQ, Naidu R, Hu ZQ, Guo DB, Chen JX, 'Combined Remediation of Eutrophic Water by Phoslock and Aerobic Denitrifying Bacteria', Huanjing Kexue/Environmental Science, 42 1861-1869 (2021) [C1]
Nitrogen and phosphorus are the leading causes of water eutrophication, and it is challenging to remove nitrogen and phosphorus effectively through a single water remediation meth... [more]
Nitrogen and phosphorus are the leading causes of water eutrophication, and it is challenging to remove nitrogen and phosphorus effectively through a single water remediation method. In this study, an aerobic denitrifying bacterium (AD-19) isolated from eutrophic water was used to construct an immobilized biofilm and combined with Phoslock¿ to remove nitrogen and phosphorus from the water. The phosphorus control efficiency of Phoslock¿, nitrogen removal performance of the denitrifying bacteria, and combined remediation performance for the eutrophic water were studied. The results demonstrated that the removal rate of PO43--P in the simulated eutrophic water reached 95% with a dosing ratio of 80 (mass ratio of Phoslock¿ to PO43--P), and phosphorus release from sediment was effectively inhibited at the same time. Strain AD-19, which was identified as Pseudomonas sp. Using the 16S rDNA method, had a good heterotrophic nitrification and aerobic denitrification ability, and more than 97% of the nitrogen was removed when NH4+-N or NO3--N was used as the nitrogen source. The feasibility of the combined remediation of the eutrophic water was demonstrated using a lake simulation device. Furthermore, this technique was used to restore a eutrophic pond in a park in Wuhan city. After 16 days of treatment, the water quality indices for nitrogen and phosphorus were improved from worse than Grade ¿ to Grade ¿ (GB 3838-2002, Ministry of Environmental Protection of China, 2002) and remained stable for more than 270 days, indicating that Phoslock¿ combined with the immobilized biofilm could quickly and effectively restore eutrophic water as well as maintain the water quality for long periods.
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Nova |
2021 |
Zazouli MA, Dehbandi R, Mohammadyan M, Aarabi M, Dominguez AO, Kelly FJ, et al., 'Physico-chemical properties and reactive oxygen species generation by respirable coal dust: Implication for human health risk assessment', JOURNAL OF HAZARDOUS MATERIALS, 405 (2021) [C1]
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Nova |
2021 |
Kulathunga MRDL, Wijayawardena MAA, Naidu R, 'Heavy metal(loid)s and health risk assessment of Dambulla vegetable market in Sri Lanka.', Environ Monit Assess, 193 230 (2021) [C1]
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Nova |
2021 |
Sobhani Z, Fang C, Naidu R, Megharaj M, 'Microplastics as a vector of toxic chemicals in soil: Enhanced uptake of perfluorooctane sulfonate and perfluorooctanoic acid by earthworms through sorption and reproductive toxicity', Environmental Technology and Innovation, 22 (2021) [C1]
The accumulation of microplastics (MP) in soil via their continuous release and degradation of large plastics has recently become a serious global problem. The major concern with ... [more]
The accumulation of microplastics (MP) in soil via their continuous release and degradation of large plastics has recently become a serious global problem. The major concern with MP is their potential to sorb pollutants as well as ingestion by living organisms. Hence, this study focused on the effect of PVC MP exposure on increasing the risk of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) bioaccumulation in earthworms in addition to their reproduction. In general, the bioaccumulation factor (BAF) for PFOA and PFOS increased up to 200% in earthworms exposed to MP-contaminated soil. MP at 500 and 1000 mg kg -1 soil caused enhanced uptake of PFOS and PFOA in earthworms, and a significant reduction in their reproduction. These results have significant implications for risk assessment of MP in soil.
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Nova |
2021 |
Kumar S, Zhao M, Zhang H, Rahman MA, Luo C, Rahman MM, 'Distribution, contamination status and source of trace elements in the soil around brick kilns', Chemosphere, 263 127882-127882 (2021) [C1]
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Nova |
2021 |
Hassan M, Deb AK, Qi F, Liu Y, Du J, Fahy A, et al., 'Magnetically separable mesoporous alginate polymer beads assist adequate removal of aqueous methylene blue over broad solution pH', Journal of Cleaner Production, 319 (2021) [C1]
Adsorption is a promising technology for removal of organic and inorganic contaminants from soil and water system. In this study, magnetically separable mesoporous polymeric beads... [more]
Adsorption is a promising technology for removal of organic and inorganic contaminants from soil and water system. In this study, magnetically separable mesoporous polymeric beads (NiZnFe4O4-HNT@alg) were synthesised for efficient removal of methylene blue (MB, cationic dye) under broad solution pH (from pH 3.41 to pH 8.43). Alginate biopolymer were used to stabilize halloysite nanotubes (HNTs) and nickel zinc iron oxide nanoparticles (NiZnFe4O4 < 100 nm). NiZnFe4O4 was incorporated onto the polymer beads to generate the adsorbents' magnetic properties and catalytic degradability. The adsorbent (NiZnFe4O4-HNT@alg) have higher surface area (122.43 m2/g), suitable mesoporosity (~6.68 nm), larger pore volume (0.11 cm3/g), and abundance of active sites, enabling high adsorption capacity (264 mg/g) of MB. The abundance of hydroxyl, carboxyl, and siloxane groups enabled cationic dye sorption through ionic interaction. The removal efficiency of MB was ~99% under a wide solution pH range from 10 mg/L of MB, in which the adsorbent dose was 2 g/L. Both Langmuir (R2 = 0.99; p < 0.001) and Freundlich (R2 = 0.99; p < 0.001) isotherm models fitted well, whereas trends of kinetics model fitting are pseudo-second-order (R2 = 0.99) > intraparticle diffusion (R2 = 0.93) > pseudo-first-order (R2 = 0.87). Energy-dispersive X-ray spectroscopy (EDS) elemental mapping demonstrated that MB has a co-distribution with silicon, aluminium, and alginate carbon phase but is limited with iron and nickel, indicating HNTs and alginate polymer performed as sorption sites, whereas NiZnFe4O4 performed as a catalyst. The presence (post-sorption) and absence (pre-sorption) of inorganic, total carbon or total organic carbon content at different solution pH, contact time, and initial concentration of MB demonstrated that the adsorbent act as a catalyst as well for degradation of MB. NiZnFe4O4-HNT@alg triggers efficient removal of MB with the assist of adsorption and catalytic degradation at broad solution pH. A comparison in removal of MB by various adsorbents including, biochars, clays, activated carbon, nanoparticles, polymers, nano composites, graphene oxides, carbon nanotubes, and polymer beads with the result of this study were performed, illustrating competitive sorption capacity of NiZnFe4O4-HNT@alg.
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Nova |
2021 |
Sheikh Fakhradini S, Moore F, Keshavarzi B, Naidu R, Wijayawardena A, Soltani N, Rostami S, 'Spatial distribution, partitioning, ecological risk and source apportionment of potential toxic elements in water and sediments of the Hoor Al-Azim wetland and their bioaccumulation in selected commercial fish species', Marine Pollution Bulletin, 172 (2021) [C1]
The potentially toxic elements (PTEs) concentrations in water and sediments were measured in the Hoor Al-Azim wetland to evaluate the spatial distribution, pollution rate, fate, p... [more]
The potentially toxic elements (PTEs) concentrations in water and sediments were measured in the Hoor Al-Azim wetland to evaluate the spatial distribution, pollution rate, fate, partitioning, and ecological risk and also to recognize the PTEs sources in sediments using MLR-APCs (multiple linear regression-absolute principal component scores) receptor model. The human health risk was investigated based on the seven fish species consumed in the study area. Based on the results, water and sediment contamination was observed at some stations in the southern part of the wetland where agricultural water drains. Also, the sediments of oil well drilling disposal site was polluted by PTEs. Based on the MLR-APCs model, 80.8% of Mo and 81.5% of Se originated from agricultural source. Total target hazard quotients (TTHQ) values suggested that the children could experience adverse health effects due to consumption of Coptodon zillii, Aspius vorax, Carassius auratus and Carasobarbus luteus.
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Nova |
2021 |
Zhang J, Hu H, Wang M, Li Y, Wu S, Cao Y, et al., 'Land application of sewage sludge biochar: Assessments of soil-plant-human health risks from potentially toxic metals', Science of the Total Environment, 756 (2021) [C1]
Effects of sewage sludge-derived biochar and its precursor on the accumulation of metals (Cd, Cu, Pb and Zn) in soil and their uptake by plants in a 1-year field experiment involv... [more]
Effects of sewage sludge-derived biochar and its precursor on the accumulation of metals (Cd, Cu, Pb and Zn) in soil and their uptake by plants in a 1-year field experiment involving corn-radish rotation were comparatively studied. The human health risks were assessed, and the safe application period of biochar were estimated. The application of biochar, compares to sewage sludge, significantly enhanced the radish yield (p < 0.05; not corn yield) and significantly reduced the accumulation of metals in both plants (p < 0.05), especially the annual application at =15 t ha-1. The hazard quotient analyses of the metals showed there were no health risks to humans (Hazard Index < 1) in consuming the edible parts of the both plants. The application of sewage sludge at =15 t ha-1 resulted in Cd in radish exceeded the threshold for foodstuffs set by China (0.1 mg kg-1). The total contents of Cd, Cu, Pb and Zn in soil increased gradually as the application of sewage sludge or its biochar increased from 7.5 t ha-1 to 30 t ha-1. More metals were found to be introduced to soil by the land application of biochar than by its precursor at the same doses, because the metals were concentrated in biochar during the preparation process. The contamination risk assessment of soil based on the geo-accumulation index, the contamination factor and the pollution load index suggested the application of biochar on farmland should <15 t ha-1. Therefore, taking into account the yield of and metal concentrations in the radish and corn plants and the contamination risks in soil, it is recommended that the continuous safe application period at an application of 7.5 t ha-1 year-1 of biochar should not exceed 15 years, and that of its precursor sewage sludge should not exceed 17 years.
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Nova |
2021 |
Islam MR, Sanderson P, Payne TE, Johansen MP, Naidu R, 'Desorption and Migration Behavior of Beryllium from Contaminated Soils: Insights for Risk-Based Management', ACS Omega, 6 30686-30697 (2021) [C1]
Factors influencing the desorption, distribution, and vertical migration behavior of Be in contaminated soils are not fully understood. This study examined the desorption and migr... [more]
Factors influencing the desorption, distribution, and vertical migration behavior of Be in contaminated soils are not fully understood. This study examined the desorption and migration of Be in a soil profile from a legacy radioactive waste disposal site using different batch leaching [monofilled waste extraction procedure (MWEP); synthetic precipitation leaching procedure (SPLP); simulated acid rain solution (SARS); and toxicity characteristic leaching procedure] and sequential leaching [community bureau of reference (BCR)] methods for insights relevant to the application of risk-based management. The results showed that Be desorption was higher in the presence of organic than the inorganic leachate composition (MWEP < SPLP < SARS < TCLP < BCR first-step). The desorption followed three diffusion control mechanisms, which resulted in three desorption rate constant estimates of 157, 87.1, and 40.4 Be/kg.h0.5, and the estimated desorption maximum was 556 µg/kg. The desorption process was, spontaneous (dG > 0), enthalpically and entropically influenced. Increasing the incubation period and heat treatment resulted in a decrease of Be desorption and migration. The soil clay content and pH were the primary factors influencing Be desorption, and the results suggested that Be was desorbed from metal oxyhydroxides and surfaces of silicates (e.g., reactive surfaces of clay minerals), organic matters, and soil pores. Because of high Kd values, the mobility of Be was limited, and no exceedances of ecological or human health risk index or guidelines were determined for the current contamination levels at the site. However, Be released from the waste trenches has the ongoing potential to increase Be concentration in the soil.
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Nova |
2021 |
Siddique AB, Rahman MM, Islam MR, Mondal D, Naidu R, 'Response of Iron and Cadmium on Yield and Yield Components of Rice and Translocation in Grain: Health Risk Estimation', Frontiers in Environmental Science, 9 (2021) [C1]
Rice consumption is a major dietary source of Cd and poses a potential threat to human health. The aims of this study were to examine the influence of Fe and Cd application on yie... [more]
Rice consumption is a major dietary source of Cd and poses a potential threat to human health. The aims of this study were to examine the influence of Fe and Cd application on yield and yield components, dynamics of Cd in pore water, translocation factors, daily dietary intake, and estimation of human health risks. A pot experiment was performed under glasshouse conditions where rice cultivars (Langi and Quest) were cultivated in two dissimilar soils under different levels of Cd (0, 1.0, and 3.0¿mg¿kg-1) and Fe (0, 1.0, and 2.0¿g¿kg-1). The results showed that variation in two rice cultivars in terms of yield and yield-related components was dose dependent. Cadmium concentration in soil pore water was decreased over time and increased with increasing Cd levels but decreased with Fe application. Translocation factors (TFs) from root to straw (TFroot-straw) or straw to husk (TFstraw-husk) were higher than root to grain (TFroot-grain) or straw to grain (TFstraw-grain). The Quest cultivar had 20% lower Cd than the Langi cultivar. Application of Fe at the rate of 1 and 2¿g¿kg-1 soil reduced Cd by 23 and 46%, respectively. Average daily intake (ADI) of Cd exceeded the permissible limit (5.8 × 10-3¿mg -1¿kg-1¿bw per week) when rice plant subjected 1 and 3¿mg¿kg-1 Cd stress with or without Fe application. Results also indicated that ADI value was lower in the Quest cultivar as compared to the Langi cultivar. Estimation of human health risk revealed that the non-carcinogenic risks (HQ > 1) and carcinogenic risks (CR > 1.0 × 10-4) increased with increasing Cd levels in the soil. The application of Fe decreased the human health risks from rice consumption which is more pronounced in Fe 2.0 than in Fe1.0 treatments. The rice cultivar grown in soil-1 (pH 4.6) showed the highest health risks as compared to soil-2 (pH 6.6) and the Quest cultivar had lower health risks than the Langi cultivar.
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Nova |
2021 |
Wang L, Cheng Y, Naidu R, Gell P, Bowman M, 'Rapid In-Field Approaches for Delineating VOC in Both Soil Vapour and Groundwater for Vapour Intrusion Assessment', Frontiers in Environmental Science, 9 (2021) [C1]
Traditional contaminated site characterisation approaches are time-consuming, labour-intensive, and demand a high level of expertise. This case study provides a rapid field-based ... [more]
Traditional contaminated site characterisation approaches are time-consuming, labour-intensive, and demand a high level of expertise. This case study provides a rapid field-based solution to investigating a VOC contaminated site and its vapour incursion by combining soil vapour and groundwater survey. To fully assess the volatile organic compound (VOC) distribution in a contaminated site, a number of self-developed soil vapour sampling probes (SVSPs) were placed vertically at different locations in a grid with different depths. Hence, 3D subsurface contour maps for VOC concentrations in soil vapour can be obtained and used to help identify hot spots and the migration patterns of VOCs. This SVSP is ¿easy-to-install¿ in the field and a cost-effective solution for rapid assessment of soil vapour samples. The SVSPs can be installed both vertically and horizontally. If there is a requirement to take soil vapour samples beneath an existing building from a potential contamination source zone, SVSPs can be horizontally installed beneath the building without compromising its structural integrity. In addition, to ascertain the correct groundwater channels that are likely to carry contaminants from a potential source zone, an electrical resistivity tomography technique was employed to provide the preliminary information for groundwater delineation in a complex groundwater channel network.
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Nova |
2021 |
Wang L, Cheng Y, Naidu R, Bowman M, 'The Key Factors for the Fate and Transport of Petroleum Hydrocarbons in Soil With Related in/ex Situ Measurement Methods: An Overview', Frontiers in Environmental Science, 9 (2021) [C1]
Once petroleum hydrocarbons (PHs) are released into the soil, the interaction between PHs and soil media is dependent not only upon the soil properties but also on the characteris... [more]
Once petroleum hydrocarbons (PHs) are released into the soil, the interaction between PHs and soil media is dependent not only upon the soil properties but also on the characteristics of PHs. In this study, the key factors influencing the interactions between PHs and soil media are discussed. The key factors include: 1) the characteristics of PHs, such as volatility and viscosity; and 2) soil properties, such as porosity, hydraulic properties and water status, and organic matter; and 3) atmospheric circumstances, such as humidity and temperature. These key factors can be measured either ex-situ using conventional laboratory methods, or in situ using portable or handheld instruments. This study overviews the current ex/in situ techniques for measuring the listed key factors for PH contaminated site assessments. It is a tendency to apply in situ methods for PH contaminated site characterisation. Furthermore, handheld/portable Fourier transform infrared spectroscopy (FTIR) instrument provides tremendous opportunities for in-field PH contaminated site assessment. This study also reviewed the non-destructive FTIR spectroscopy analysis coupling with handheld FTIR for in-field PH contaminated site characterisation, including determining the concentration of total PH, dominant PH fractions and soil key properties for PH transport modelling.
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Nova |
2021 |
Fang C, Sobhani Z, Zhang X, McCourt L, Routley B, Gibson CT, Naidu R, 'Identification and visualisation of microplastics / nanoplastics by Raman imaging (iii): algorithm to cross-check multi-images', Water Research, 194 (2021) [C1]
We recently developed the Raman mapping image to visualise and identify microplastics / nanoplastics (Fang et al. 2020, Sobhani et al. 2020). However, when the Raman signal is low... [more]
We recently developed the Raman mapping image to visualise and identify microplastics / nanoplastics (Fang et al. 2020, Sobhani et al. 2020). However, when the Raman signal is low and weak, the mapping uncertainty from the individual Raman peak intensity increases and may lead to images with false positive or negative features. For real samples, even the Raman signal is high, a low signal-noise ratio still occurs and leads to the mapping uncertainty due to the high spectrum background when: the target plastic is dispersed within another material with interfering Raman peaks; materials are present that exhibit broad Raman peaks; or, materials are present that fluoresce when exposed to the excitation laser. In this study, in order to increase the mapping certainty, we advance the algorithm to combine and merge multi-images that have been simultaneously mapped at the different characteristic peaks from the Raman spectra, akin imaging via different mapping channels simultaneously. These multi-images are merged into one image via algorithms, including colour off-setting to collect signal with a higher ratio of signal-noise, logic-OR to pick up more signal, logic-AND to eliminate noise, and logic-SUBTRACT to remove image background. Specifically, two or more Raman images can act as ¿parent images¿, to merge and generate a ¿daughter image¿ via a selected algorithm, to a ¿granddaughter image¿ via a further selected algorithm, and to an ¿offspring image¿ etc. More interestingly, to validate this algorithm approach, we analyse microplastics / nanoplastics that might be generated by a laser printer in our office or home. Depending on the toner and the printer, we might print and generate millions of microplastics and nanoplastics when we print a single A4 document.
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Nova |
2021 |
Bagherifam S, Brown TC, Fellows CM, Naidu R, Komarneni S, 'Highly efficient removal of antimonite (Sb (III)) from aqueous solutions by organoclay and organozeolite: Kinetics and Isotherms', Applied Clay Science, 203 (2021) [C1]
Clays modified by cationic surfactants have been widely used for the removal of organic and inorganic anionic contaminants. However, their suitability for the removal of antimonit... [more]
Clays modified by cationic surfactants have been widely used for the removal of organic and inorganic anionic contaminants. However, their suitability for the removal of antimonite from aqueous solutions has not been systematically studied. In this study, hexadecylpyridinium chloride modified montmorillonite (HDPy+-M) and hexadecylpyridinium bromide modified zeolite (HDPy+-Z) were used to measure Sb(III) uptake from solutions containing 0.5¿2.5 mM antimonite. Adsorption isotherms of antimonite were studied using the Langmuir and Freundlich equations. Adsorption kinetics were investigated using pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion models. The results of X-ray diffraction showed a large interlayer expansion for HDPy+-M, whereas the X-ray patterns of HDPy+-Z remained unchanged. Uptake of Sb(III) by both HDPy+-M and HDPy+-Z could be fitted well to the Langmuir isotherm, while the kinetics of adsorption could be described well using the pseudo-second-order model. Maximum adsorption capacities for Sb(III) uptake by HDPy+-M and HDPy+-Z were calculated to be 108.7 and 61.34 mg g-1, respectively. The results of the kinetic studies revealed that Sb(III) adsorption to HDPy+-Z was found to be quite fast and the reaction reached equilibrium in 8 h, whereas for HDPy+-M equilibration was attained within 24 h. The adsorption of antimonite onto both HDPy+-M and HDPy+-Z was found to be selective in the presence of Cl-1 and SO4-2 competitive anions. Considering the high affinity for Sb(III) uptake from solutions containing high concentrations of antimonite, both HDPy+-M and HDPy+-Z could be used as promising adsorbents for environmental applications.
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Nova |
2021 |
Sivaram AK, Logeshwaran P, Surapaneni A, Shah K, Crosbie N, Rogers Z, et al., 'Evaluation of Cyto-genotoxicity of Perfluorooctane Sulfonate (PFOS) to Allium cepa', ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY, 40 792-798 (2021) [C1]
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Nova |
2021 |
Gerdelidani AF, Towfighi H, Shahbazi K, Lamb DT, Choppala G, Abbasi S, et al., 'Arsenic geochemistry and mineralogy as a function of particle-size in naturally arsenic-enriched soils', Journal of Hazardous Materials, 403 (2021) [C1]
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Nova |
2021 |
Rathnayake IVN, Megharaj M, Beer M, Naidu R, 'Medium composition affects the heavy metal tolerance of microalgae: a comparison', Journal of Applied Phycology, 33 3683-3695 (2021) [C1]
Tolerance of the three metals cadmium (Cd), copper (Cu), and zinc (Zn) by four microalgal species was investigated in three different culture media available in the literature tog... [more]
Tolerance of the three metals cadmium (Cd), copper (Cu), and zinc (Zn) by four microalgal species was investigated in three different culture media available in the literature together with a modified version in order to study the effect of growth media components in estimating the bioavailability of metals introduced into the medium. The free metal content of each medium was also determined using Visual MINTEQ version 3.1 to compare the bioassays. Four microalgal isolates were identified as Desmodesmus sp-I, Desmodesmus sp-II, Coelastrella sp., and Chlorella vulgaris. The present work demonstrated that the microalgal media components have a profound effect on the bioavailability of the metals in the media, so that the bioassay results may vary depending on the growth medium used in the experiments. Furthermore, the free metal contents in each media varied depending on the concentrations of metals added. The tolerance of microalgae evaluated as 50% effective concentration (EC50) of metals differed significantly (p < 0.05) depending on the growth medium used and also varied between the species of the same genus. Desmodesmus sp-I showed high sensitivity to Cd (EC50 0.220 ± 0.011¿mg L-1) and Zn (EC50 0.464 ± 0.065¿mg L-1), whereas Desmodesmus sp-II showed high sensitivity to Cu (EC50 0.098 ± 0.002¿mg L-1) when grown in Test Medium 1 (TM1). The Chlorella vulgaris strain was found to be the most resistant microalga among the four isolates tested in this study. This study has significant implications for the risk assessment of these metals using algal bioassays.
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Nova |
2021 |
Abbasi S, Lamb D, Rahman MA, Naidu R, Megharaj M, 'Response of phosphorus sensitive plants to arsenate', Environmental Technology and Innovation, 24 (2021) [C1]
Arsenate (As (V)) is a highly toxic species of arsenic (As) which is also an excellent phosphate analogue. Plant species that are adapted to phosphorus (P) impoverished soil displ... [more]
Arsenate (As (V)) is a highly toxic species of arsenic (As) which is also an excellent phosphate analogue. Plant species that are adapted to phosphorus (P) impoverished soil display a negative response to elevated phosphate due to an inability to downregulate P acquisition. Despite widespread As contamination and shared transport systems for As (V) and P uptake, little to no information is available on the response of P-sensitive plants to As (V). The aim of the study was to investigate the response of P-sensitive plants to As (V). One high (Hakea prostrata R.BR) and one moderate (Banksia seminuda B.Rye) P-sensitive species and one vegetable plant species (Cucumis sativus L.) were grown in nutrient solution containing different As (V) concentrations. Based on EC50 data from nutrient culture, Hakea prostrata was the most sensitive species to As (V) followed by B. seminuda and C. sativus. Critical exogenous concentrations of As that reduced plant growth by 50 % (EC50) in H. prostrata, B. seminuda and C. sativus were respectively 0.64, 0.76 and 1.08 µM for shoot and 0.66, 0.51, 1.07 µM for root. Hakea prostrata had the highest translocation factor (ratio of As concentration in shoot to root) of 0.11, followed by B. seminuda (0.03), and C. sativus (0.01). Plant species with high and moderate P sensitivity were associated with high sensitivity to As (V) exposure and accumulation in shoots. The increased sensitivity has important implications in ecological risk assessment and selection of plant species for rehabilitation. The impacts of As(V) at low P levels in soil solution is needed to inform contaminated site assessment and rehabilitation.
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Najafi Z, Golchin A, Naidu R, 'The effects of chitosan composites on the immobilization of chromium in soil and marigold (Calendula officinalis) growth', INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 19 6057-6070 (2021) [C1]
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2021 |
Khan AUH, Liu Y, Naidu R, Fang C, Dharmarajan R, Shon H, 'Interactions between zinc oxide nanoparticles and hexabromocyclododecane in simulated waters', Environmental Technology and Innovation, 24 (2021) [C1]
The zinc oxide nanoparticles (ZnO-NPs) have been increasingly applied in industries and consumer products, causing release of these nanoparticles in environments. The behaviour of... [more]
The zinc oxide nanoparticles (ZnO-NPs) have been increasingly applied in industries and consumer products, causing release of these nanoparticles in environments. The behaviour of ZnO-NPs in the water systems is complicated due to the presence of different cations, anions, organic substances (e.g. humic acid HA) and other organic pollutants (e.g. commonly used brominated flame retardant, BFR). In particular, the aggregation and alteration of these nanoparticles can be influenced by co-existence contaminants. In this study, the interactions between hexabromocyclododecane (HBCD) and ZnO-NPs were investigated for the physicochemical properties and colloidal stability changes in various simulated waters. This is significant to understand the fate and behaviour of ZnO-NPs at environmental relevant conditions. The surface chemistry and particle size distribution (PSD) of ZnO-NPs with and without the existence of HBCD, HA and electrolytes (NaCl, CaCl2 and MgCl2) after different periods (1 and 3 weeks) were investigated at pH 7.00 ± 0.02. The size of the ZnO-NPs increased from nanometres to micrometres with the addition of numerous concentrations of HBCD, HA, and cations and their mixtures. The zeta potential of ZnO-NPs increased upon addition of HBCD, HA and electrolytes indicating a more stable agglomeration form while less agglomeration was observed in the ZnO-NPs and HA suspension after 3 weeks. Hydrophobic and electrostatic interactions, van der Waals forces, including hydrogen bonding and cation bridging could be potential interactive driving forces. The results indicated agglomeration of ZnO-NPs in the existence of organic substances, salts and contaminants, thus sedimentation and precipitation are promising under salty surface water/sea water.
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2021 |
Biswas B, Naidu R, 'Highly stable and nontoxic lanthanum-treated activated palygorskite for the removal of lake water phosphorus', Processes, 9 (2021) [C1]
Nutrient pollution of surface water, such as excess phosphate loading on lake surface water, is a significant issue that causes ecological and financial damage. Despite many techn... [more]
Nutrient pollution of surface water, such as excess phosphate loading on lake surface water, is a significant issue that causes ecological and financial damage. Despite many technologies that can remove available phosphate, such as material-based adsorption of those available phosphate ions, the development of a material that can trap them from the surface water is worth doing, considering other aspects. These aspects are: (i) efficient adsorption by the material while it settles down to the water column, and (ii) the material itself is not toxic to the lake natural microorganism. Considering these aspects, we developed a trace lanthanum-grafted surface-modified palygorskite, a fibrous clay mineral. It adsorbed a realistic amount of phosphate from the lake water (typically 0.13¿0.22 mg/L). The raw and modified palygorskite (Pal) includes unmodified Australian Pal, heated (at ~400¿ C) Pal, and acid (with 3 M HCl)-treated Pal. Among them, while acid-treated Pal grafted a lower amount of La, it had a higher adsorption capacity (1.243 mg/g) and a quicker adsorption capacity in the time it took to travel to the bottom of the lake (97.6% in 2 h travel time), indicating the adsorption role of both La and clay mineral. The toxicity of these materials was recorded null, and in some period of the incubation of the lake microorganism with the material mixture, La-grafted modified clays increased microbial growth. As a total package, while a high amount of La on the already available material could adsorb a greater amount of phosphate, in this study a trace amount of La on modified clays showed adsorption effectiveness for the realistic amount of phosphate in lake water without posing added toxicity.
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2021 |
Fang C, Luo Y, Zhang X, Zhang H, Nolan A, Naidu R, 'Identification and visualisation of microplastics via PCA to decode Raman spectrum matrix towards imaging', CHEMOSPHERE, 286 (2021) [C1]
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2021 |
Basak BB, Sarkar B, Naidu R, 'Environmentally safe release of plant available potassium and micronutrients from organically amended rock mineral powder', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 43 3273-3286 (2021) [C1]
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2021 |
Bolan S, Seshadri B, Grainge I, Talley NJ, Naidu R, 'Gut microbes modulate bioaccessibility of lead in soil', Chemosphere, 270 (2021) [C1]
Metabolic uptake of lead (Pb) is controlled by its bioaccessibility. Most studies have examined bioaccessibility of Pb in the absence of gut microbes, which play an important role... [more]
Metabolic uptake of lead (Pb) is controlled by its bioaccessibility. Most studies have examined bioaccessibility of Pb in the absence of gut microbes, which play an important role in the metabolic uptake of nutrients and metal(loid)s in intestine. In this study, we examined the effect of three gut microbes, from various locations in the gut, on the bioaccessibility of soil ingested Pb. The gut microbes include Lactobacillus acidophilus, Lactobacillus rhamnosus and Escherichia coli. Lead toxicity to these three microbes was also examined at various pH values. Bioaccessibility of Pb was measured using gastric and intestinal extractions. Both Pb spiked and Pb-contaminated shooting range field soils were used to measure Pb bioaccessibility in the presence and absence of gut microbes. The results indicated that Pb toxicity to gut microbes, as measured by LD50 value, decreased with increasing pH, and was higher for Lactobacillus species. Gut microbes decreased the bioaccessible Pb; the effect was more pronounced at low pH, mimicking gastric conditions than in conditions closer to the intestine. Lead adsorption by these microbes increased at the higher pH tested, and E. coli adsorbed higher amounts of Pb than did the Lactobacillus species. The effect of gut microbes on reducing Pb bioaccessibility may be attributed to microbially-induced immobilization of Pb through adsorption, precipitation, and complexation reactions. The study demonstrates that bioaccessibility and subsequently bioavailability of metal(loid)s can be modulated by gut microbes, and it is important to undertake bioaccessibility measurements in the presence of gut microbes.
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2021 |
Abbasi S, Lamb DT, Kader M, Naidu R, Megharaj M, 'The influence of long-term ageing on arsenic ecotoxicity in soil', Journal of Hazardous Materials, 407 (2021) [C1]
The ageing of a contaminant in soil influences the bioavailability and toxicity of environmental pollutants. Yet, despite arsenic (As) being an important terrestrial contaminant, ... [more]
The ageing of a contaminant in soil influences the bioavailability and toxicity of environmental pollutants. Yet, despite arsenic (As) being an important terrestrial contaminant, the effect of As ageing on phytotoxicity has received relatively little research. Research to date has reported predominantly short term (< 0.5 years) experiments. Here, we studied the influence of ageing over 0.25 and 5 years on the phytotoxicity of As (as arsenate) on Cucumis sativus L. (cucumber). The study showed that increasing ageing time of As from 0.25 to 5 years increased the EC10 and EC50 values by 4.0 and 1.76 fold, respectively. The dependence of ageing on soil properties was also examined, although only Freundlich sorption parameters were correlated to the ageing factor (r = 0.68, P = 0.028). Soils with high adsorption capacity also showed the greatest change in toxicity over 5 years. In addition, data was compiled from relevant literature to develop a model for As ecotoxicity. The combined model (n = 54) showed no relationship with pH but was correlated to the oxalate extractable iron content and %clay. Arsenate ecotoxicity (EC50, mg/kg) in the multivariate model was related to oxalate iron content, %clay and ageing time. Thus, the results of this study have significant implications for risk assessment of long-term As contaminated soils.
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2021 |
Arachchige Chamila Samarasinghe SV, Krishnan K, Aitken RJ, Naidu R, Megharaj M, 'Persistence of the parabens in soil and their potential toxicity to earthworms', ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY, 83 (2021) [C1]
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2021 |
Islam MR, Sanderson P, Naidu R, Payne TE, Johansen MP, Bari ASMF, Rahman MM, 'Beryllium in contaminated soils: Implication of beryllium bioaccessibility by different exposure pathways', JOURNAL OF HAZARDOUS MATERIALS, 421 (2021) [C1]
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2021 |
Lamb D, Choppala G, Yeasmin M, Abbasi S, Wang L, Naidu R, et al., 'Are root elongation assays suitable for establishing metallic anion ecotoxicity thresholds?', Journal of Hazardous Materials Letters, 2 (2021) [C1]
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2021 |
Fang C, Sobhani Z, Zhang D, Zhang X, Gibson CT, Tang Y, et al., 'Capture and characterisation of microplastics printed on paper via laser printer's toners', Chemosphere, 281 (2021) [C1]
Microplastics are among the ubiquitous contaminants in our environment. As emerging contaminants, microplastics are still facing with lots of challenges on the characterisation, i... [more]
Microplastics are among the ubiquitous contaminants in our environment. As emerging contaminants, microplastics are still facing with lots of challenges on the characterisation, including their capture, identification and visualisation, particularly from a complex background. For example, when we print documents using a laser printer, we are printing microplastics onto paper, because the plastics are the main ingredient of the toner powder mixture. Characterisation of these microplastic mixture meets an even more complicated challenge, because plastic's signals might be shielded by other toner powder ingredients such as the pigments, the dyes, the black carbon, and the paper fabrics as well. To solve this challenge, we employ various techniques, including SEM, TEM, XPS, FT-IR, TGA and Raman, to characterise the microplastics printed via the toner powders. Interestingly, we show that Raman can distinguish and visualise the distribution of the microplastics from the complex background of the mixture. We estimate the millions of toner powders, each of which is ~4¿6 µm in size, are printed out per A4 sheet as microplastics. The findings send a strong warning that millions of microplastics might be generated from the printing activities in our daily lives.
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Bhattacharjya S, Sahu A, Phalke DH, Manna MC, Thakur JK, Mandal A, et al., 'In situ decomposition of crop residues using lignocellulolytic microbial consortia: a viable alternative to residue burning', Environmental Science and Pollution Research, 28 32416-32433 (2021) [C1]
Open field burning of crop residue causes severe air pollution and greenhouse gas emission contributing to global warming. In order to seek an alternative, the current study was i... [more]
Open field burning of crop residue causes severe air pollution and greenhouse gas emission contributing to global warming. In order to seek an alternative, the current study was initiated to explore the prospective of lignocellulolytic microbes to expedite in situ decomposition of crop residues. Field trials on farmers¿ field were conducted in the state of Haryana and Maharashtra, to target the burning of rice and wheat residue and sugarcane trash, respectively. A comparative study among crop residue removal (CRR), crop residue burning (CRB) and in situ decomposition of crop residues (IND) revealed that IND of rice and wheat residues took 30¿days whereas IND of sugarcane trash took 45¿days. The decomposition status was assessed by determining the initial and final lignin to cellulose ratio which increased significantly from 0.23 to 0.25, 0.21 to 0.23 and 0.24 to 0.27 for rice, wheat residues and sugarcane trash, respectively. No yield loss was noticed in IND for both rice-wheat system and sugarcane-based system; rather IND showed relatively better crop yield as well as soil health parameters than CRB and CRR. Furthermore, the environmental impact assessment of residue burning indicated a substantial loss of nutrients (28¿31, 23¿25 and 51¿77¿kg¿ha-1 of N+P2O5+K2O for rice, wheat and sugarcane residue) as well as the emission of pollutants to the atmosphere. However, more field trials, as well as refinement of the technology, are warranted to validate and establish the positive potential of in situ decomposition of crop residue to make it a successful solution against the crop residue burning.
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2021 |
Liu W, Yang X, Duan L, Naidu R, Yan K, Liu Y, et al., 'Variability in plant trace element uptake across different crops, soil contamination levels and soil properties in the Xinjiang Uygur Autonomous Region of northwest China', Scientific Reports, 11 (2021) [C1]
This study investigated contamination status of eight trace elements (As, Cd, Cr, Hg, Pb, Cu, Zn and Ni) in farmland soils and crops at 535 sites across the Xinjiang Uygur Autonom... [more]
This study investigated contamination status of eight trace elements (As, Cd, Cr, Hg, Pb, Cu, Zn and Ni) in farmland soils and crops at 535 sites across the Xinjiang Uygur Autonomous Region, Northwest China. Land use types of the sampling sites included vegetable patch, grain field and orchard. Our experimental results indicated all farmland soils were considered as trace element contamination based on the Nemerow comprehensive pollution index (NCPI > 1). However, 91.97% of the crop samples were uncontaminated according to the Chinese Risk Control Standard. Soils from the vegetable patch showed higher pollution level comparison with that from grain field and orchard. Health risks for both non-carcinogenic and carcinogenic risks were calculated through crop ingestion exposure pathway. Grain samples showed highest health risks, followed by melon and fruit, and vegetables. The health risks of crops were mainly driven by Cr and Cd. Crop consumption may pose risks for children but not adults. The source of trace element contamination in the different farmland soils varied and may be attributed to the different agricultural activities. Plant type had a greater influence on the trace element accumulation in crops compared with soil trace element contents and physicochemical properties.
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2021 |
Umeh AC, Naidu R, Shilpi S, Boateng EB, Rahman A, Cousins IT, et al., 'Sorption of PFOS in 114 Well-Characterized Tropical and Temperate Soils: Application of Multivariate and Artificial Neural Network Analyses', Environmental Science and Technology, 55 1779-1789 (2021) [C1]
The influence of soil properties on PFOS sorption are not fully understood, particularly for variable charge soils. PFOS batch sorption isotherms were conducted for 114 temperate ... [more]
The influence of soil properties on PFOS sorption are not fully understood, particularly for variable charge soils. PFOS batch sorption isotherms were conducted for 114 temperate and tropical soils from Australia and Fiji, that were well-characterized for their soil properties, including total organic carbon (TOC), anion exchange capacity, and surface charge. In most soils, PFOS sorption isotherms were nonlinear. PFOS sorption distribution coefficients (Kd) ranged from 5 to 229 mL/g (median: 28 mL/g), with 63% of the Fijian soils and 35% of the Australian soils showing Kd values that exceeded the observed median Kd. Multiple linear regression showed that TOC, amorphous aluminum and iron oxides contents, anion exchange capacity, pH, and silt content, jointly explained about 53% of the variance in PFOS Kd in soils. Variable charge soils with net positive surface charges, and moderate to elevated TOC content, generally displayed enhanced PFOS sorption than in temperate or tropical soils with TOC as the only sorbent phase, especially at acidic pH ranges. For the first time, two artificial neural networks were developed to predict the measured PFOS Kd (R2 = 0.80) in the soils. Overall, both TOC and surface charge characteristics of soils are important for describing PFOS sorption.
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2021 |
Khodabakhshloo N, Biswas B, Moore F, Du J, Naidu R, 'Organically functionalized bentonite for the removal of perfluorooctane sulfonate, phenanthrene and copper mixtures from wastewater', APPLIED CLAY SCIENCE, 200 (2021) [C1]
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2021 |
Bagherifam S, Brown TC, Wijayawardena A, Naidu R, 'The influence of different antimony (Sb) compounds and ageing on bioavailability and fractionation of antimony in two dissimilar soils', ENVIRONMENTAL POLLUTION, 270 (2021) [C1]
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2021 |
Rahman MM, Alauddin M, Alauddin ST, Siddique AB, Islam MR, Agosta G, et al., 'Bioaccessibility and speciation of arsenic in children's diets and health risk assessment of an endemic area in Bangladesh', Journal of Hazardous Materials, 403 (2021) [C1]
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Naidu R, Biswas B, Willett IR, Cribb J, Kumar Singh B, Paul Nathanail C, et al., 'Chemical pollution: A growing peril and potential catastrophic risk to humanity', Environment International, 156 (2021) [C1]
Anthropogenic chemical pollution has the potential to pose one of the largest environmental threats to humanity, but global understanding of the issue remains fragmented. This art... [more]
Anthropogenic chemical pollution has the potential to pose one of the largest environmental threats to humanity, but global understanding of the issue remains fragmented. This article presents a comprehensive perspective of the threat of chemical pollution to humanity, emphasising male fertility, cognitive health and food security. There are serious gaps in our understanding of the scale of the threat and the risks posed by the dispersal, mixture and recombination of chemicals in the wider environment. Although some pollution control measures exist they are often not being adopted at the rate needed to avoid chronic and acute effects on human health now and in coming decades. There is an urgent need for enhanced global awareness and scientific scrutiny of the overall scale of risk posed by chemical usage, dispersal and disposal.
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Baek K, Alessi DS, Naidu R, 'Preface - Recent advances in cleanup of contaminated sites', JOURNAL OF SOILS AND SEDIMENTS, 21 2731-2731 (2021)
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2021 |
Rathnayake IVN, Megharaj M, Naidu R, 'Green fluorescent protein based whole cell bacterial biosensor for the detection of bioavailable heavy metals in soil environment', Environmental Technology and Innovation, 23 (2021) [C1]
A Green fluorescent protein (GFP) based whole cell bacterial biosensor was prepared using a bacterial strain sensitive to several heavy metals in order to detect bioavailable heav... [more]
A Green fluorescent protein (GFP) based whole cell bacterial biosensor was prepared using a bacterial strain sensitive to several heavy metals in order to detect bioavailable heavy metals in soils. The transformant, named as Bacillus megaterium VR1 was immobilized in silica matrix using sol¿gel technology, and optimized for its effective pH range, cell density, exposure time, and storage stability. The lowest detection limit (LOD) for each metal was also determined. The pH range for the bacterial strain was found to be between pH 5¿8.5. The optimum exposure time for the transformed bacterial strain to respond to the lowest tested concentration of heavy metal at 25% of inhibition compared to the control was determined as 4 h, 4 h, and 7 h, for Cd, Cu and Zn, respectively. SiNa/LUDOX 1/1 was selected as the optimum immobilization matrix. Storage up to 2 weeks did not show any reduction in the fluorescence in all the matrices. The linear range of the whole cell bacterial biosensor was determined as 0-10; 0¿20 and 0¿100 mg/L for Cd, Cu and Zn respectively. The lowest detection limit was determined as 1.42 × 10-4, 3.16 × 10-4, and 2.42 × 10-4 mg/L for Cd, Cu and Zn, respectively.
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2021 |
Gao Y, Du J, Bahar MM, Wang H, Subashchandrabose S, Duan L, et al., 'Metagenomics analysis identifies nitrogen metabolic pathway in bioremediation of diesel contaminated soil', Chemosphere, 271 (2021) [C1]
Nitrogen amendment is known to effectively enhance the bioremediation of hydrocarbon-contaminated soil, but the nitrogen metabolism in this process is not well understood. To unra... [more]
Nitrogen amendment is known to effectively enhance the bioremediation of hydrocarbon-contaminated soil, but the nitrogen metabolism in this process is not well understood. To unravel the nitrogen metabolic pathway(s) of diesel contaminated soil, six types of nitrogen sources were added to the diesel contaminated soil. Changes in microbial community and soil enzyme genes were investigated by metagenomics analysis and chemical analysis through a 30-day incubation study. The results showed that ammonium based nitrogen sources significantly accelerated the degradation of total petroleum hydrocarbon (TPH) (79¿81%) compared to the control treatment (38%) and other non-ammonium based nitrogen amendments (43¿57%). Different types of nitrogen sources could dramatically change the microbial community structure and soil enzyme gene abundance. Proteobacteria and Actinobacteria were identified as the two dominant phyla in the remediation of diesel contaminated soil. Metagenomics analysis revealed that the preferred metabolic pathway of nitrogen was from ammonium to glutamate via glutamine, and the enzymes governing this transformation were glutamine synthetase and glutamate synthetase; while in nitrate based amendment, the conversion from nitrite to ammonium was restrained by the low abundance of nitrite reductase enzyme and therefore retarded the TPH degradation rate. It is concluded that during the process of nitrogen enhanced bioremediation, the most efficient nitrogen cycling direction was from ammonium to glutamine, then to glutamate, and finally joined with carbon metabolism after transforming to 2-oxoglutarate.
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2021 |
Islam MR, Sanderson P, Johansen MP, Payne TE, Naidu R, 'The influence of soil properties on sorption-desorption of beryllium at a low level radioactive legacy waste site', Chemosphere, 268 (2021) [C1]
This study examined the influence of soil physicochemical properties on the sorption, desorption and kinetics of beryllium (Be) uptake and release on soils from a legacy waste sit... [more]
This study examined the influence of soil physicochemical properties on the sorption, desorption and kinetics of beryllium (Be) uptake and release on soils from a legacy waste site in Australia. This information is needed to help explain the current distribution of Be at the site and evaluate potential future environmental risks. Sorption was determined by a batch study and key soil properties were assessed to explain Be retention. The soil was favourable for sorption of Be (up to 99%) due to organic content, negative surface charge, soil oxyhydroxides (Fe/Al/Mn¿O/OH) and the porosity of the soil structure. Lesser sorption was observed in the presence of a background electrolyte (NaNO3). Sorption closely followed pseudo second order kinetics and was best described by the Langmuir model. FTIR analysis suggested that chemisorption was the predominant mechanism of Be sorption. Desorption was very low and best described by the Freundlich model. The low desorption reflected the high Kd (up to 6624 L/kg), and the presence of hysteresis suggested partially irreversible binding of Be with active surfaces of the soil matrix (minerals, SOM, oxyhydroxides of Fe/Al/Mn etc.). Intra-particle diffusion of Be and entrapment in the pores contribute to the irreversible binding. The sorption behaviour of Be helped to explain the relative immobility of Be at the site despite the significant quantities of Be disposed. Soil physicochemical properties were significant for Be sorption, through influencing both the uptake and desorption, and this demonstrates the implications of these measurements for evaluating potential future risks to the environment.
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2021 |
Unnithan A, Bekele DN, Chadalavada S, Naidu R, 'Insights into vapour intrusion phenomena: Current outlook and preferential pathway scenario', Science of the Total Environment, 796 (2021) [C1]
Vapour intrusion (VI) is the phenomenon by which volatile organic compounds (VOCs) migrate from the subsurface source through the soil and enter into the overlying buildings, affe... [more]
Vapour intrusion (VI) is the phenomenon by which volatile organic compounds (VOCs) migrate from the subsurface source through the soil and enter into the overlying buildings, affecting the indoor air quality and ultimately causing health hazards to the occupants. Health risk assessments associated with hydrocarbon contaminated sites and recommendations of site closure are often made by quantifying the VI risks using mathematical models known as ¿vapour intrusion models¿ (VIM). In order to predict the health risk, various factors such as the lithological and geochemical conditions of the subsurface, environmental conditions, building operational conditions etc. are commonly evaluated using VIMs. Use of these models can overlook the role of preferential pathways like highly permeable subsurface layers and utility lines which act as the path of least resistance for vapour transport, which can increase the VI risks. The extensive networks of utility lines and sanitary sewer systems in urban areas can significantly exacerbate the uncertainty of VI investigations. The backfill materials like sand and gravel surrounding the utility lines can allow the vapours to easily pass through due to their high porosity as compared to natural formations. Hence, failure to understand the role of preferential pathways on the fate and transport of VOC in the vadose zone can result in more conservative predictions of indoor air vapour concentrations and wrong clean up approaches. This comprehensive review outlines the vapour transport mechanisms, factors influencing VI, VIMs and the role of preferential pathways in predicting indoor air vapour concentrations.
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Bolan S, Seshadri B, Keely S, Kunhikrishnan A, Bruce J, Grainge I, et al., 'Bioavailability of arsenic, cadmium, lead and mercury as measured by intestinal permeability', Scientific Reports, 11 (2021) [C1]
In this study, the intestinal permeability of metal(loid)s (MLs) such as arsenic (As), cadmium (Cd), lead (Pb) and mercury (Hg) was examined, as influenced by gut microbes and che... [more]
In this study, the intestinal permeability of metal(loid)s (MLs) such as arsenic (As), cadmium (Cd), lead (Pb) and mercury (Hg) was examined, as influenced by gut microbes and chelating agents using an in vitro gastrointestinal/Caco-2 cell intestinal epithelium model. The results showed that in the presence of gut microbes or chelating agents, there was a significant decrease in the permeability of MLs (As-7.5%, Cd-6.3%, Pb-7.9% and Hg-8.2%) as measured by apparent permeability coefficient value (Papp), with differences in ML retention and complexation amongst the chelants and the gut microbes. The decrease in ML permeability varied amongst the MLs. Chelating agents reduce intestinal absorption of MLs by forming complexes thereby making them less permeable. In the case of gut bacteria, the decrease in the intestinal permeability of MLs may be associated to a direct protection of the intestinal barrier against the MLs or indirect intestinal ML sequestration by the gut bacteria through adsorption on bacterial surface. Thus, both gut microbes and chelating agents can be used to decrease the intestinal permeability of MLs, thereby mitigating their toxicity.
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Al Amin M, Luo Y, Nolan A, Robinson F, Niu J, Warner S, et al., 'Total oxidisable precursor assay towards selective detection of PFAS in AFFF', Journal of Cleaner Production, 328 (2021) [C1]
Total oxidisable precursor assay (TOP assay) can degrade and convert ¿unknown¿ per- and polyfluoroalkyl substances (PFAS) to detectable PFAS. However, the detailed degradation pat... [more]
Total oxidisable precursor assay (TOP assay) can degrade and convert ¿unknown¿ per- and polyfluoroalkyl substances (PFAS) to detectable PFAS. However, the detailed degradation pathway is still not known, particularly when the TOP assay is applied to analyse complex samples such as aqueous film-forming foam (AFFF). To gain insights into the pathway and the effectiveness of the TOP assay, several ¿known¿ compounds are first tested as controls, including sodium dodecyl benzene sulphate (SDBS), perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS). Secondly, the test is expanded to several PFAS precursors such as 6:2 fluorotelomer sulfonate (6:2 FTS), 8:2 fluorotelomer sulfonate (8:2 FTS), and a cationic surfactant N-ethyl-N-(2-hydroxyethyl) perfluorooctyl sulfonamide (EtFOSE). Thirdly, the TOP assay is used to test ¿unknown¿ PFAS samples that have been previously used as AFFF in Australia. The degradation products are monitored, to compare the mass balance and propose the degradation pathway. While HPLC-MS/MS is typically employed to detect the individual TOP assay products, most of which are perfluoroalkyl carboxylic acids (PFCA), an app-based smartphone sensor can also provide semi-quantitative results as a sum. Overall, the results indicate the effectiveness of the TOP assay to assess the presence of PFAS precursors in the AFFF samples, with some variations in the end products. Recommendations for enhancement of the TOP assay are also provided.
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Siddique AB, Rahman MM, Islam MR, Naidu R, 'Varietal variation and formation of iron plaques on cadmium accumulation in rice seedling', Environmental Advances, 5 (2021) [C1]
This study examined the impact of iron (Fe) plaque deposition and varietal variation on cadmium (Cd) accumulation in the rice plants (Oryza sativa L.) in a hydroponic experiment u... [more]
This study examined the impact of iron (Fe) plaque deposition and varietal variation on cadmium (Cd) accumulation in the rice plants (Oryza sativa L.) in a hydroponic experiment under controlled conditions. Fe was applied at the rate of 0, 50 and 100 mg L-1 to the nutrient solution to generate varying amounts of Fe plaque deposition around the root of the rice seedlings. The seedlings were then treated with Cd at the rate of 0, 0.5 and 1.0 mg L-1 in the nutrient solution. Reddish-brown colored Fe plaque is induced gradually on the roots of rice seedlings after Fe supplementation in the nutrient solution. Results showed that the biomass production differed markedly among the rice varieties due to the application of Fe with or without Cd stress. The Quest variety demonstrated the highest capacity of Fe plaque formation compared to the other varieties. The application of Fe and Cd significantly affected the Cd concentration in the citrate-bicarbonate-dithionite (CBD) extracts of roots and in the rice seedlings. The exogenous application of Cd significantly increased the root Cd content, which was greater than the shoot Cd content. The Fe plaque deposition capacity markedly varied among the examined varieties. The Cd concentrations in shoots declined by adding Fe. This study results demonstrated that boosted Fe plaque formation can minimize detrimental effects of Cd on rice shoot growth to some extent, but the root tissues are the main barrier to Cd accumulation and movements in the interior of the rice plants.
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2021 |
Murtaza G, Rehman MZ, Qadir M, Shehzad MT, Zeeshan N, Ahmad HR, et al., 'High residual sodium carbonate water in the Indian subcontinent: concerns, challenges and remediation', INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 18 3257-3272 (2021) [C1]
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2021 |
Uz-Zaman KA, Biswas B, Rahman MM, Naidu R, 'Smectite-supported chain of iron nanoparticle beads for efficient clean-up of arsenate contaminated water', Journal of Hazardous Materials, 407 (2021) [C1]
Prolonged exposure to inorganic arsenic (As) via drinking water is a major concern as it poses significant human health risks. Removal of As is crucial but requires effective and ... [more]
Prolonged exposure to inorganic arsenic (As) via drinking water is a major concern as it poses significant human health risks. Removal of As is crucial but requires effective and environment-friendly clean-up technology to avoid any additional risk to the environment. In this study, we developed Australian smectite (smec)-supported nano zero-valent iron (nZVI) composite for arsenate i.e., As(V) sorption. We used a range of tools, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and energy dispersion X-ray (EDS) spectroscopy to characterise the material. SEM and TEM images and elemental mapping of the composite reflect that the smectite layer was surrounded by a chain of iron nanobeads evenly distributed on clay particles, which is quite exceptional among currently available nZVIs. The maximum As(V) sorption capacity of this composite was 23.12 mg/g in the ambient conditions. Using X-ray photoelectron spectroscopy we unveiled chemical states of As and Fe before and after the sorption process. Additionally, the release of iron nanoparticles from the composite at various pHs (3-10) were found negligible, which demonstrates the effectiveness of smec-nZVI to remove As(V) from contaminated water without posing any secondary pollutant.
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Nova |
2021 |
Zhang J, Wu S, Xu J, Liang P, Wang M, Naidu R, et al., 'Comparison of ashing and pyrolysis treatment on cadmium/zinc hyperaccumulator plant: Effects on bioavailability and metal speciation in solid residues and risk assessment', Environmental Pollution, 272 (2021) [C1]
Phytoremediation of metal(loid)s contaminated sites is widely used, while there is scarce of investigation on the metal-enriched biomass waste safely disposal which resulted in ri... [more]
Phytoremediation of metal(loid)s contaminated sites is widely used, while there is scarce of investigation on the metal-enriched biomass waste safely disposal which resulted in risks of causing secondary pollution to the soil and water bodies and even to human health. Thus, this study compared the effects of ashing and pyrolysis treatments on cadmium (Cd) and zinc (Zn) hyperaccumulation plant Sedum plumbizincicola. Chemical speciation, the Toxicity Characteristic Leaching Procedure (TCLP), and diethylenetriamine pentaacetic acid (DTPA) extraction were employed to characterize the bioavailability and leachability of Cd and Zn in the solid residues after pyrolysis and ashing. The risk assessment code (RAC) and potential ecological risk index (RI) were subsequently used to evaluate the risk of the solid residues to the environment. The results showed that both ashing and pyrolysis treatments could transform the bioavailable Cd and Zn in S. plumbizincicola into a more stable form, and the higher the temperature the greater the stablility. Pyrolysis converted a maximum of 80.0% of Cd and 70.3% of Zn in S. plumbizincicola to the oxidisable and residual fractions, compared with ashing which achieved only a ~42% reduction. The pyrolysis process minimised the risk level of Cd and Zn to the environment based on the RAC and RI assessments. The results of the TCLP test, and DTPA extraction confirmed that the leaching rate and the bioavailable portion of Cd and Zn in the biochars produced by pyrolysis were invariably significantly (p < 0.05) lower than the solid residues produced by ashing, and reached the lowest at 650 °C. In other words, pyrolysis was better than ashing for thermal treatment of the metal-enriched hyperaccumulator plant, in view of minimising the bioavailability and leachability of Cd and Zn from the solid residues to the environment. This study provides fundamental data on the choice of treatments for the disposal of metal-enriched plant biomass.
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Nova |
2021 |
Rahman MA, Lamb D, Rahman MM, Bahar MM, Sanderson P, Abbasi S, et al., 'Removal of arsenate from contaminated waters by novel zirconium and zirconium-iron modified biochar', Journal of Hazardous Materials, 409 (2021) [C1]
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Nova |
2021 |
Sobhani Z, Luo Y, Gibson CT, Tang Y, Naidu R, Megharaj M, Fang C, 'Collecting Microplastics in Gardens: Case Study (i) of Soil', Frontiers in Environmental Science, 9 (2021) [C1]
As an emerging contaminant, microplastic is receiving increasing attention. However, the contamination source is not fully known, and new sources are still being identified. Herew... [more]
As an emerging contaminant, microplastic is receiving increasing attention. However, the contamination source is not fully known, and new sources are still being identified. Herewith, we report that microplastics can be found in our gardens, either due to the wrongdoing of leaving plastic bubble wraps to be mixed with mulches or due to the use of plastic landscape fabrics in the mulch bed. In the beginning, they were of large sizes, such as > 5¿mm. However, after 7 years in the garden, owing to natural degradation, weathering, or abrasion, microplastics are released. We categorize the plastic fragments into different groups, 5¿mm¿0.75¿mm, 0.75¿mm¿100¿µm, and 100¿0.8¿µm, using filters such as kitchenware, meaning we can collect microplastics in our gardens by ourselves. We then characterized the plastics using Raman image mapping and a logic-based algorithm to increase the signal-to-noise ratio and the image certainty. This is because the signal-to-noise ratio from a single Raman spectrum, or even from an individual peak, is significantly less than that from a spectrum matrix of Raman mapping (such as 1 vs. 50 × 50) that contains 2,500 spectra, from the statistical point of view. From the 10¿g soil we sampled, we could detect the microplastics, including large (5¿mm¿100¿µm) fragments and small (<100¿µm) ones, suggesting the degradation fate of plastics in the gardens. Overall, these results warn us that we must be careful when we do gardening, including selection of plastic items for gardens.
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Nova |
2021 |
Zhang D, Ding A, Li T, Wu X, Liu Y, Naidu R, 'Immobilization of Cd and Pb in a contaminated acidic soil amended with hydroxyapatite, bentonite, and biochar', JOURNAL OF SOILS AND SEDIMENTS, 21 2262-2272 (2021) [C1]
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Nova |
2021 |
Usmani Z, Sharma M, Awasthi AK, Sharma GD, Cysneiros D, Nayak SC, et al., 'Minimizing hazardous impact of food waste in a circular economy Advances in resource recovery through green strategies', Journal of Hazardous Materials, 416 (2021) [C1]
Recent trends in food waste and its management have increasingly started to focus on treating it as a reusable resource. The hazardous impact of food waste such as the release of ... [more]
Recent trends in food waste and its management have increasingly started to focus on treating it as a reusable resource. The hazardous impact of food waste such as the release of greenhouse gases, deterioration of water quality and contamination of land areas are a major threat posed by food waste. Under the circular economy principles, food waste can be used as a sustainable supply of high-value energy, fuel, and nutrients through green techniques such as anaerobic digestion, co-digestion, composting, enzymatic treatment, ultrasonic, hydrothermal carbonization. Recent advances made in anaerobic co-digestion are helping in tackling dual or even multiple waste streams at once with better product yields. Integrated approaches that employ pre-processing the food waste to remove obstacles such as volatile fractions, oils and other inhibitory components from the feedstock to enhance their bioconversion to reduce sugars. Research efforts are also progressing in optimizing the operational parameters such as temperature, pressure, pH and residence time to enhance further the output of products such as methane, hydrogen and other platform chemicals such as lactic acid, succinic acid and formic acid. This review brings together some of the recent progress made in the green strategies towards food waste valorization.
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Nova |
2021 |
Shahriar S, Haque MM, Naidu R, Rahman MM, 'Concentrations of toxic elements and health risk assessment in arum grown in arsenic-contaminated areas of Bangladesh', Food Control, 129 (2021) [C1]
Arum plant parts such as stem, leaf and corm and the corresponding farm soils were sampled from four As-impacted districts of Bangladesh to assess the potential health risk to hum... [more]
Arum plant parts such as stem, leaf and corm and the corresponding farm soils were sampled from four As-impacted districts of Bangladesh to assess the potential health risk to humans from toxic elements (TEs) including arsenic (As), cadmium (Cd) and lead (Pb). The mean concentrations of As in arum leaf, stem and corm were 150 µg/kg, 107 µg/kg and 101 µg/kg, respectively, whereas mean Cd in arum leaf, stem and corm were 115 µg/kg, 261 µg/kg and 180 µg/kg, respectively and mean Pb in arum leaf, stem and corm were 595 µg/kg, 403 µg/kg and 577 µg/kg, respectively. Daily dietary intake of As, Cd and Pb from sampled arum were 0.003, 0.008 and 0.021 µg/kg bw for adults. As per capita intake of arum is low, hazard quotient (HQ) values for all TEs were found minimal, which reveals no appreciable health risk associated with arum consumption to the local inhabitants.
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Nova |
2021 |
Perera IA, Abinandan S, Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Microalgal-bacterial consortia unveil distinct physiological changes to facilitate growth of microalgae', FEMS Microbiology Ecology, 97 (2021) [C1]
Physiological changes that drive the microalgal-bacterial consortia are poorly understood so far. In the present novel study, we initially assessed five morphologically distinct m... [more]
Physiological changes that drive the microalgal-bacterial consortia are poorly understood so far. In the present novel study, we initially assessed five morphologically distinct microalgae for their ability in establishing consortia in Bold's basal medium with a bacterial strain, Variovorax paradoxus IS1, all isolated from wastewaters. Tetradesmus obliquus IS2 and Coelastrella sp. IS3 were further selected for gaining insights into physiological changes, including those of metabolomes in consortia involving V. paradoxus IS1. The distinct parameters investigated were pigments (chlorophyll a, b, and carotenoids), reactive oxygen species (ROS), lipids and metabolites that are implicated in major metabolic pathways. There was a significant increase (>1.2-fold) in pigments, viz., chlorophyll a, b and carotenoids, decrease in ROS and an enhanced lipid yield (>2-fold) in consortia than in individual cultures. In addition, the differential regulation of cellular metabolites such as sugars, amino acids, organic acids and phytohormones was distinct among the two microalgal-bacterial consortia. Our results thus indicate that the selected microalgal strains, T. obliquus IS2 and Coelastrella sp. IS3, developed efficient consortia with V. paradoxus IS1 by effecting the required physiological changes, including metabolomics. Such microalgal-bacterial consortia could largely be used in wastewater treatment and for production of value-added metabolites.
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Nova |
2021 |
Lamb D, Choppala G, Yeasmin M, Abbasi S, Wang L, Naidu R, et al., 'Are root elongation assays suitable for establishing metallic anion ecotoxicity thresholds?', Journal of Hazardous Materials Letters, 2 100024-100024 (2021)
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2021 |
Zheng L, Gao Y, Du J, Zhang W, Huang Y, Zhao Q, et al., 'Single and binary adsorption behaviour and mechanisms of cd
The chitosan¿EDTA modified magnetic biochar (E¿CMBC) was successfully used as a novel adsorbent to remove heavy metals. The adsorption behaviour and mechanisms of E¿CMBC to Cd2+, ... [more]
The chitosan¿EDTA modified magnetic biochar (E¿CMBC) was successfully used as a novel adsorbent to remove heavy metals. The adsorption behaviour and mechanisms of E¿CMBC to Cd2+, Cu2+ and Ni2+ were performed in single and binary system in aqueous solutions. In single¿metal system, the adsorption process of Cd2+, Cu2+ and Ni2+ on E¿CMBC fitted well with the Avrami fractional¿order kinetics model and the Langmuir isotherm model. The measured maximum adsorption capacities were 61.08 mg g-1, 48.36 mg g-1 and 41.17 mg g-1 for Cd2+, Cu2+ and Ni2+, respectively. In binary¿metal system, coexisting ions have obvious competitive adsorption behaviour on E¿CMBC when the concentration of heavy meal beyond 20 mg L-1 . The maximum adsorption capacities of the heavy metals were found to be lower than that in single¿metal system. The order of the competitive adsorption ability was Cu2+ > Ni2+ > Cd2+ . Interestingly, in Cd2+¿Cu2+ system the earlier adsorbed Cd2+ could be completely replaced by Cu2+ from the solution. Different competitive adsorption ability of those heavy metal were due to the characteristics of heavy metal and resultant affinity of the adsorption sites on E¿CMBC. The adsorption mechanism indicated that chemical adsorption played a dominating role. Therefore, E¿CMBC could be a potential adsorbent for wastewater treatment.
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Nova |
2021 |
Hassan M, Liu Y, Naidu R, Du J, Qi F, Donne SW, Islam MM, 'Mesoporous Biopolymer Architecture Enhanced the Adsorption and Selectivity of Aqueous Heavy-Metal Ions', ACS Omega, 6 15316-15331 (2021) [C1]
Halloysite nanotubes (HNT) and ball-milled biochar (BC) incorporated biocompatible mesoporous adsorbents (HNT-BC@Alg) were synthesized for adsorption of aqueous heavy-metal ions. ... [more]
Halloysite nanotubes (HNT) and ball-milled biochar (BC) incorporated biocompatible mesoporous adsorbents (HNT-BC@Alg) were synthesized for adsorption of aqueous heavy-metal ions. HNT-BC@Alg outperformed the BC, HNT, and BC@Alg in removing cadmium (Cd), copper (Cu), nickel (Ni), and lead (Pb). Mesoporous structure (?7.19 to 7.56 nm) of HNT-BC@Alg was developed containing an abundance of functional groups induced from encapsulated BC and tubular HNT, which allowed heavy metals to infiltrate and interact with the adsorbents. Siloxane groups from HNT, oxygen-containing functional groups from BC, and hydroxyl and carboxyl groups from alginate polymer play a significant role in the adsorption of heavy-metal ions. The removal percentage of heavy metals was recorded as Pb (?99.97 to 99.05%) > Cu (?95.01 to 90.53%) > Cd (?92.5 to 55.25%) > Ni (?80.85 to 50.6%), even in the presence of 0.01/0.001 M of CaCl2 and Na2SO4 as background electrolytes and charged organic molecule under an environmentally relevant concentration (200 µg/L). The maximum adsorption capacities of Ni, Cd, Cu, and Pb were calculated as 2.85 ± 0.08, 6.96 ± 0.31, 16.87 ± 1.50, and 26.49 ± 2.04 mg/g, respectively. HNT-BC@Alg has fast sorption kinetics and maximum adsorption capacity within a short contact time (?2 h). Energy-dispersive X-ray spectroscopy (EDS) elemental mapping exhibited that adsorbed heavy metals co-distributed with Ca, Si, and Al. The reduction of surface area, pore volume, and pore area of HNT-BC@Alg (after sorption of heavy metals) confirms that mesoporous surface (2-18 nm) supports diffusion, infiltration, and interaction. However, a lower range of mesoporous diameter of the adsorbent is more suitable for the adsorption of heavy-metal ions. The adsorption isotherm and kinetics fitted well with the Langmuir isotherm and the pseudo-second-order kinetic models, demonstrating the monolayer formation of heavy-metal ions through both the physical sorption and chemical sorption, including pore filling, ion exchange, and electrostatic interaction.
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Nova |
2021 |
Ramadass K, Kuppusamy S, Venkateswarlu K, Naidu R, Megharaj M, 'Unresolved complex mixtures of petroleum hydrocarbons in the environment: An overview of ecological effects and remediation approaches', Critical Reviews in Environmental Science and Technology, 51 2872-2894 (2021) [C1]
Unresolved complex mixtures (UCMs) of hydrocarbons are the pollutants of serious concern commonly occurring in most of the environments contaminated with petroleum hydrocarbons. U... [more]
Unresolved complex mixtures (UCMs) of hydrocarbons are the pollutants of serious concern commonly occurring in most of the environments contaminated with petroleum hydrocarbons. UCMs constitute a relatively unidentified group of compounds compared to the well-resolved hydrocarbons that could easily be identified by the modern chromatographic methods. UCMs that accumulate in the environment cause several toxicological effects of ecological significance, and indirectly affect the human health. Despite decades-long efforts to provide adequate information in this area of research, the fate and environmental impacts of UCMs of petroleum hydrocarbons are poorly understood. Techniques for extraction and analysis of UCMs in the environment are very important in their identification and quantification. Also, remediation of toxic UCMs of petroleum hydrocarbons is all the more essential. In fact, UCMs are often neglected in the risk assessments due to lack of proper identification methods and toxicity data. This critical review presents an overview of our current knowledge on the environmental occurrence, sources, separation, and identification methods for UCMs. The ecological toxicity of UCMs toward the biota and the strategies for remediation of the environments contaminated with UCMs have also been discussed in detail.
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Nova |
2021 |
Saini A, Bekele DN, Chadalavada S, Fang C, Naidu R, 'Electrokinetic remediation of petroleum hydrocarbon contaminated soil (I)', Environmental Technology and Innovation, 23 (2021) [C1]
The remediation of petroleum hydrocarbons (TPH) in a contaminated soil by electrokinetic (EK) treatment was studied in the laboratory. The effects of applying a constant electrica... [more]
The remediation of petroleum hydrocarbons (TPH) in a contaminated soil by electrokinetic (EK) treatment was studied in the laboratory. The effects of applying a constant electrical current on soil pH, moisture content, electrical conductivity (EC), temperature, and the concentrations of three fractions of TPH (C10¿C16, C17¿C34 and C35¿C40) were investigated. The experiment was run for seven days and soil samples were collected at the end of the 7 day period for analysis of soil pH and TPH concentration. There were extreme pH conditions near the electrodes. At the end of the experiment there was around a 37% reduction of C10¿C16 chain compounds compared to the initial concentration of 164 ± 18 mg/kg. The study investigated TPH remediation to a depth of 24 cm, which is significantly more than most studies of EK remediation of TPH-contaminated soils. We observed reductions in TPH concentrations even at a depth of 24 cm. The spatial distribution of reductions in TPH concentrations was also studied and it was observed that more remediation occurred near the cathodes than near the anodes. Further, the greatest reductions in TPH concentrations were recorded near the electrodes in the lowest and middle parts of the experimental set-up. The application of electrokinetics to remediate TPH-contaminatedsoils could be a viable option as an in situ remediation technology.
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Nova |
2020 |
Besha AT, Liu Y, Fang C, Bekele DN, Naidu R, 'Assessing the interactions between micropollutants and nanoparticles in engineered and natural aquatic environments', Critical Reviews in Environmental Science and Technology, 50 135-215 (2020) [C1]
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Nova |
2020 |
Sivaram AK, Subashchandrabose SR, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Rhizodegradation of PAHs differentially altered by C3 and C4 plants', Scientific Reports, 10 (2020) [C1]
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Nova |
2020 |
Saini A, Bekele DN, Chadalavada S, Fang C, Naidu R, 'A review of electrokinetically enhanced bioremediation technologies for PHs', Journal of Environmental Sciences, 88 31-45 (2020) [C1]
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Nova |
2020 |
Wang L, Cheng Y, Lamb D, Naidu R, 'The application of rapid handheld FTIR petroleum hydrocarbon-contaminant measurement with transport models for site assessment: A case study', Geoderma, 361 (2020) [C1]
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Nova |
2020 |
Logeshwaran P, Sivaram AK, Yadav M, Chadalavada S, Naidu R, Megharaj M, 'Phytotoxicity of Class B aqueous firefighting formulations, Tridol S 3 and 6% to Lemna minor', Environmental Technology and Innovation, 18 (2020) [C1]
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Nova |
2020 |
Naidu R, Nadebaum P, Fang C, Cousins I, Pennell K, Conder J, et al., 'Per- and poly-fluoroalkyl substances (PFAS): Current status and research needs', Environmental Technology and Innovation, 19 (2020) [C1]
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Nova |
2020 |
Sobhani Z, Zhang X, Gibson C, Naidu R, Megharaj M, Fang C, 'Identification and visualisation of microplastics/nanoplastics by Raman imaging (i): Down to 100 nm', Water Research, 174 (2020) [C1]
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Nova |
2020 |
Logeshwaran P, Krishnan K, Naidu R, Megharaj M, 'Purification and characterization of a novel fenamiphos hydrolysing enzyme from Microbacterium esteraromaticum MM1', Chemosphere, 252 (2020) [C1]
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Nova |
2020 |
Shahriar S, Rahman MM, Naidu R, 'Geographical variation of cadmium in commercial rice brands in Bangladesh: Human health risk assessment', Science of the Total Environment, 716 (2020) [C1]
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Nova |
2020 |
Biswas B, Juhasz AL, Mahmudur Rahman M, Naidu R, 'Modified clays alter diversity and respiration profile of microorganisms in long-term hydrocarbon and metal co-contaminated soil', Microbial Biotechnology, 13 522-534 (2020) [C1]
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Nova |
2020 |
Nuruzzaman M, Ren J, Liu Y, Rahman MM, Shon HK, Naidu R, 'Hollow Porous Silica Nanosphere with Single Large Pore Opening for Pesticide Loading and Delivery', ACS Applied Nano Materials, 3 105-113 (2020) [C1]
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Nova |
2020 |
Hassan M, Liu Y, Naidu R, Du J, Qi F, 'Adsorption of Perfluorooctane sulfonate (PFOS) onto metal oxides modified biochar', Environmental Technology and Innovation, 19 (2020) [C1]
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Nova |
2020 |
Sobhani Z, Lei Y, Tang Y, Wu L, Zhang X, Naidu R, et al., 'Microplastics generated when opening plastic packaging', Scientific reports, 10 (2020) [C1]
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Nova |
2020 |
Bahar MM, Mahbub KR, Naidu R, Megharaj M, 'A simple spectrophotometric method for rapid quantitative screening of arsenic bio-transforming bacteria', Environmental Technology and Innovation, 19 (2020) [C1]
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Nova |
2020 |
Bidast S, Golchin A, Baybordi A, Zamani A, Naidu R, 'The effects of non-stabilised and Na-carboxymethylcellulose-stabilised iron oxide nanoparticles on remediation of Co-contaminated soils', Chemosphere, 261 (2020) [C1]
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Nova |
2020 |
Wang X, Luo X, Wang Q, Liu Y, Naidu R, 'Predicting the combined toxicity of binary metal mixtures (Cu-Ni and Zn-Ni) to wheat.', Ecotoxicology and Environmental Safety, 205 (2020) [C1]
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Nova |
2020 |
Fang C, Sobhani Z, Zhang X, Gibson CT, Tang Y, Naidu R, 'Identification and visualisation of microplastics/ nanoplastics by Raman imaging (ii): Smaller than the diffraction limit of laser?', Water Research, 183 (2020) [C1]
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Nova |
2020 |
Abbasi S, Moore F, Keshavarzi B, Hopke PK, Naidu R, Rahman MM, et al., 'PET-microplastics as a vector for heavy metals in a simulated plant rhizosphere zone', Science of the Total Environment, 744 (2020) [C1]
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Nova |
2020 |
Lei YJ, Tian Y, Sobhani Z, Naidu R, Fang C, 'Synergistic degradation of PFAS in water and soil by dual-frequency ultrasonic activated persulfate', Chemical Engineering Journal, 388 (2020) [C1]
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Nova |
2020 |
Liu Y, Qi F, Fang C, Naidu R, Duan L, Dharmarajan R, Annamalai P, 'The effects of soil properties and co-contaminants on sorption of perfluorooctane sulfonate (PFOS) in contrasting soils', Environmental Technology and Innovation, 19 (2020) [C1]
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Nova |
2020 |
Sivaram AK, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'The impact of low molecular weight organic acids from plants with C3 and C4 photosystems on the rhizoremediation of polycyclic aromatic hydrocarbons contaminated soil', Environmental Technology and Innovation, 19 (2020) [C1]
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Nova |
2020 |
Al Amin M, Sobhani Z, Chadalavada S, Naidu R, Fang C, 'Smartphone-based / Fluoro-SPE for selective detection of PFAS at ppb level', Environmental Technology and Innovation, 18 (2020) [C1]
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Nova |
2020 |
Al Amin M, Sobhani Z, Liu Y, Dharmaraja R, Chadalavada S, Naidu R, et al., 'Recent advances in the analysis of per- and polyfluoroalkyl substances (PFAS) A review', Environmental Technology and Innovation, 19 (2020) [C1]
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Nova |
2020 |
Anantha MS, Olivera S, Hu C, Jayanna BK, Reddy N, Venkatesh K, et al., 'Comparison of the photocatalytic, adsorption and electrochemical methods for the removal of cationic dyes from aqueous solutions', Environmental Technology and Innovation, 17 (2020) [C1]
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Nova |
2020 |
Manna MC, Sahu A, De N, Thakur JK, Mandal A, Bhattacharjya S, et al., 'Novel bio-filtration method for the removal of heavy metals from municipal solid waste', Environmental Technology and Innovation, 17 (2020) [C1]
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Nova |
2020 |
Eugenio NR, Naidu R, Colombo CM, 'Global approaches to assessing, monitoring, mapping, and remedying soil pollution', ENVIRONMENTAL MONITORING AND ASSESSMENT, 192 (2020)
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2020 |
Halim MA, Rahman MM, Megharaj M, Naidu R, 'Cadmium Immobilization in the Rhizosphere and Plant Cellular Detoxification: Role of Plant-Growth-Promoting Rhizobacteria as a Sustainable Solution', Journal of Agricultural and Food Chemistry, 68 13497-13529 (2020) [C1]
Food is the major cadmium (Cd)-exposure pathway from agricultural soils to humans and other living entities and must be reduced in an effective way. A plant can select beneficial ... [more]
Food is the major cadmium (Cd)-exposure pathway from agricultural soils to humans and other living entities and must be reduced in an effective way. A plant can select beneficial microbes, like plant-growth-promoting rhizobacteria (PGPR), depending upon the nature of root exudates in the rhizosphere, for its own benefits, such as plant growth promotion as well as protection from metal toxicity. This review intends to seek out information on the rhizo-immobilization of Cd in polluted soils using the PGPR along with plant nutrient fertilizers. This review suggests that the rhizo-immobilization of Cd by a combination of PGPR and nanohybrid-based plant nutrient fertilizers would be a potential and sustainable technology for phytoavailable Cd immobilization in the rhizosphere and plant cellular detoxification, by keeping the plant nutrition flow and green dynamics of plant nutrition and boosting the plant growth and development under Cd stress.
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Nova |
2020 |
Usese AI, Chukwu LO, Naidu R, Islam S, Rahman MM, 'Arsenic fractionation in sediments and speciation in muscles of fish, Chrysichthys nigrodigitatus from a contaminated tropical Lagoon, Nigeria', Chemosphere, 256 (2020) [C1]
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Nova |
2020 |
Rahman MM, Shehzad MT, Nayak AK, Sharma S, Yeasmin M, Samanta S, et al., 'Health risks from trace elements in muscles of some commonly available fish in Australia and India', Environmental Science and Pollution Research, 27 21000-21012 (2020) [C1]
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Nova |
2020 |
Lal MS, Megharaj M, Naidu R, Bahar MM, 'Uptake of perfluorooctane sulfonate (PFOS) by common home-grown vegetable plants and potential risks to human health', Environmental Technology and Innovation, 19 (2020) [C1]
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Nova |
2020 |
Duan Q, Duan L, Liu Y, Naidu R, Zhang H, Lei Y, 'A novel in-situ passive sampling technique in the application of monitoring diuron in the aquatic environment', Environmental Technology and Innovation, 20 (2020) [C1]
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Nova |
2020 |
Bekele DN, Liu Y, Donaghey M, Umeh A, Arachchige CSV, Chadalavada S, Naidu R, 'Separation and Lithological Mapping of PFAS Mixtures in the Vadose Zone at a Contaminated Site', Frontiers in Water, 2 [C1]
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Nova |
2020 |
Yan K, Dong Z, Naidu R, Liu Y, Li Y, Wijayawardena A, et al., 'Comparison of in vitro models in a mice model and investigation of the changes in Pb speciation during Pb bioavailability assessments', Journal of Hazardous Materials, 388 (2020) [C1]
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Nova |
2020 |
Hassan M, Naidu R, Du J, Liu Y, Qi F, 'Critical review of magnetic biosorbents: Their preparation, application, and regeneration for wastewater treatment', SCIENCE OF THE TOTAL ENVIRONMENT, 702 (2020) [C1]
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Nova |
2020 |
Besha AT, Liu Y, Bekele DN, Dong Z, Naidu R, Gebremariam GN, 'Sustainability and environmental ethics for the application of engineered nanoparticles', ENVIRONMENTAL SCIENCE & POLICY, 103 85-98 (2020) [C1]
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Nova |
2020 |
Hassan M, Liu Y, Naidu R, Parikh SJ, Du J, Qi F, Willett IR, 'Influences of feedstock sources and pyrolysis temperature on the properties of biochar and functionality as adsorbents: A meta-analysis', Science of the Total Environment, 744 (2020) [C1]
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Nova |
2020 |
Zhang J, Jin J, Wang M, Naidu R, Liu Y, Man YB, et al., 'Co-pyrolysis of sewage sludge and rice husk/ bamboo sawdust for biochar with high aromaticity and low metal mobility.', Environmental Research, 191 (2020) [C1]
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Nova |
2020 |
Kulathunga MRDL, Wijayawardena MAA, Naidu R, Wimalawansa SJ, Wijeratne AW, 'Association between body mass index and estimated glomerular filtration rate in patients with chronic kidney disease of unknown aetiology in Sri Lanka', Environmental Geochemistry and Health, 42 2645-2653 (2020) [C1]
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Nova |
2019 |
Bagherifam S, Brown TC, Fellows CM, Naidu R, 'Bioavailability of Arsenic and Antimony in Terrestrial Ecosystems: A Review', Pedosphere, 29 681-720 (2019) [C1]
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Nova |
2019 |
Hassan AK, Rahman MM, Chattopadhay G, Naidu R, 'Kinetic of the degradation of sulfanilic acid azochromotrop (SPADNS) by Fenton process coupled with ultrasonic irradiation or L-cysteine acceleration', Environmental Technology and Innovation, 15 (2019) [C1]
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Nova |
2019 |
Yan K, Dong Z, Wijayawardena MAA, Liu Y, Li Y, Naidu R, 'The source of lead determines the relationship between soil properties and lead bioaccessibility', Environmental Pollution, 246 53-59 (2019) [C1]
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Nova |
2019 |
Mukkata K, Kantachote D, Wittayaweerasak B, Megharaj M, Naidu R, 'The potential of mercury resistant purple nonsulfur bacteria as effective biosorbents to remove mercury from contaminated areas', Biocatalysis and Agricultural Biotechnology, 17 93-103 (2019) [C1]
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Nova |
2019 |
Sivaram AK, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Phytoremediation efficacy assessment of polycyclic aromatic hydrocarbons contaminated soils using garden pea (Pisum sativum)and earthworms (Eisenia fetida)', Chemosphere, 229 227-235 (2019) [C1]
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Nova |
2019 |
Umeh AC, Panneerselvan L, Duan L, Naidu R, Semple KT, 'Bioaccumulation of benzo[a]pyrene nonextractable residues in soil by Eisenia fetida and associated background-level sublethal genotoxicity (DNA single-strand breaks)', Science of the Total Environment, 691 605-610 (2019) [C1]
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Nova |
2019 |
Biswas B, Warr LN, Hilder EF, Goswami N, Rahman MM, Churchman JG, et al., 'Biocompatible functionalisation of nanoclays for improved environmental remediation.', Chemical Society Reviews, 48 3740-3770 (2019) [C1]
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Nova |
2019 |
Wang L, Cheng Y, Lamb D, Megharaj M, Naidu R, 'Application of Ion Selective Electrode array to simultaneously determinate multi-free ions in solution', Environmental Technology and Innovation, 15 (2019) [C1]
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Nova |
2019 |
Shilpi S, Lamb D, Bolan N, Seshadri B, Choppala G, Naidu R, 'Waste to watt: Anaerobic digestion of wastewater irrigated biomass for energy and fertiliser production', Journal of Environmental Management, 239 73-83 (2019) [C1]
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Nova |
2019 |
Desalegn B, Megharaj M, Chen Z, Naidu R, 'Green synthesis of zero valent iron nanoparticle using mango peel extract and surface characterization using XPS and GC-MS', Heliyon, 5 (2019) [C1]
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Nova |
2019 |
Jamil S, Loganathan P, Kandasamy J, Listowski A, Khourshed C, Naidu R, Vigneswaran S, 'Removal of dissolved organic matter fractions from reverse osmosis concentrate: Comparing granular activated carbon and ion exchange resin adsorbents', Journal of Environmental Chemical Engineering, 7 (2019) [C1]
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Nova |
2019 |
Goswami N, Biswas B, Naidu R, Vasilev K, 'Spatially Localized Synthesis of Metal Nanoclusters on Clay Nanotubes and Their Catalytic Performance', ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 7 18350-18358 (2019) [C1]
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Nova |
2019 |
Sobhani Z, Al Amin M, Naidu R, Megharaj M, Fang C, 'Identification and visualisation of microplastics by Raman mapping', Analytica Chimica Acta, 1077 191-199 (2019) [C1]
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Nova |
2019 |
Subashchandrabose SR, Venkateswarlu K, Venkidusamy K, Palanisami T, Naidu R, Megharaj M, 'Bioremediation of soil long-term contaminated with PAHs by algal bacterial synergy of Chlorella sp. MM3 and Rhodococcus wratislaviensis strain 9 in slurry phase', Science of the Total Environment, 659 724-731 (2019) [C1]
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Nova |
2019 |
Umeh AC, Duan L, Naidu R, Semple KT, 'Extremely small amounts of B[a]P residues remobilised in long-term contaminated soils: A strong case for greater focus on readily available and not total-extractable fractions in risk assessment', Journal of Hazardous Materials, 368 72-80 (2019) [C1]
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Nova |
2019 |
España VAA, Sarkar B, Biswas B, Rusmin R, Naidu R, 'Environmental applications of thermally modified and acid activated clay minerals: Current status of the art', Environmental Technology and Innovation, 13 383-397 (2019) [C1]
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Nova |
2019 |
Sanderson P, Thangavadivel K, Ranganathan S, Chadalavada S, Naidu R, Bowman M, 'Effectiveness of gravity based particle separation and soil washing for reduction of Pb in a clay loam shooting range soil', Environmental Technology and Innovation, 16 (2019) [C1]
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Nova |
2019 |
Bekele DN, Du J, de Freitas LG, Mallavarapu M, Chadalavada S, Naidu R, 'Actively facilitated permeable reactive barrier for remediation of TCE from a low permeability aquifer: Field application', Journal of Hydrology, 572 592-602 (2019) [C1]
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Nova |
2019 |
Wang L, Cheng Y, Lamb D, Dharmarajan R, Chadalavada S, Naidu R, 'Application of infrared spectrum for rapid classification of dominant petroleum hydrocarbon fractions for contaminated site assessment', Spectrochimica Acta Part A-Molecular And Biomolecular Spectroscopy, 207 183-188 (2019) [C1]
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Nova |
2019 |
Fang C, Sobhani Z, Niu J, Naidu R, 'Removal of PFAS from aqueous solution using PbO2 from lead-acid battery', CHEMOSPHERE, 219 36-44 (2019) [C1]
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Nova |
2019 |
Sivaram AK, Subashchandrabose SR, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Metabolomics reveals defensive mechanisms adapted by maize on exposure to high molecular weight polycyclic aromatic hydrocarbons.', Chemosphere, 214 771-780 (2019) [C1]
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Nova |
2019 |
Sivaram AK, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Low molecular weight organic acids enhance the high molecular weight polycyclic aromatic hydrocarbons degradation by bacteria', Chemosphere, 222 132-140 (2019) [C1]
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Nova |
2019 |
Nayak AK, Rahman MM, Naidu R, Dhal B, Swain CK, Nayak AD, et al., 'Current and emerging methodologies for estimating carbon sequestration in agricultural soils: A review', Science of the Total Environment, 665 890-912 (2019) [C1]
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Nova |
2019 |
Meng F, Yang X, Duan L, Naidu R, Nuruzzaman M, Semple KT, 'Influence of pH, electrical conductivity and ageing on the extractability of benzo[a]pyrene in two contrasting soils', Science of the Total Environment, 690 647-653 (2019) [C1]
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Nova |
2019 |
Dong Z, Wang H, Yu YY, Li YB, Naidu R, Liu Y, 'Using 2003 2014 U.S. NHANES data to determine the associations between per- and polyfluoroalkyl substances and cholesterol: Trend and implications', Ecotoxicology and Environmental Safety, 173 461-468 (2019) [C1]
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Nova |
2019 |
Islam S, Rahman MM, Naidu R, 'Impact of water and fertilizer management on arsenic bioaccumulation and speciation in rice plants grown under greenhouse conditions.', Chemosphere, 214 606-613 (2019) [C1]
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Nova |
2019 |
Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Biodegradation of high-molecular weight PAHs by Rhodococcus wratislaviensis strain 9: Overexpression of amidohydrolase induced by pyrene and BaP', Science of the Total Environment, 651 813-821 (2019) [C1]
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Nova |
2019 |
Hoque MIU, Yamauchi Y, Naidu R, Holze R, Saidur R, Qu Q, et al., 'A Facile Synthesis of Hematite Nanorods from Rice Starch and Their Application to Pb(II) Ions Removal', CHEMISTRYSELECT, 4 3730-3736 (2019) [C1]
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Nova |
2019 |
Dong Z, Naidu R, 'Response to comment on: Dong et al. (2017) "issues raised by the reference doses for perfluorooctonate sulfonate and perfluorooctanoic acid"', ENVIRONMENT INTERNATIONAL, 126 802-803 (2019)
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2019 |
Liu Y, Du J, Dong Z, Rahman MM, Gao Y, Yan K, Naidu R, 'Bioavailability and risk estimation of heavy metal(loid)s in chromated copper arsenate treated timber after remediation for utilisation as garden materials.', Chemosphere, 216 757-765 (2019) [C1]
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Nova |
2019 |
Kulathunga MRDL, Ayanka Wijayawardena MA, Naidu R, Wijeratne AW, 'Chronic kidney disease of unknown aetiology in Sri Lanka and the exposure to environmental chemicals: a review of literature', Environmental Geochemistry and Health, 41 2329-2338 (2019) [C1]
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Nova |
2019 |
Umeh AC, Duan L, Naidu R, Esposito M, Semple KT, 'In vitro gastrointestinal mobilization and oral bioaccessibility of PAHs in contrasting soils and associated cancer risks: Focus on PAH nonextractable residues', Environment International, 133 (2019) [C1]
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Nova |
2019 |
Simon JA, Abrams S, Bradburne T, Bryant D, Burns M, Cassidy D, et al., 'PFAS Experts Symposium: Statements on regulatory policy, chemistry and analtyics, toxicology, transport/fate, and remediation for per- and polyfluoroalkyl substances (PFAS) contamination issues', Remediation, 29 31-48 (2019) [C1]
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Nova |
2019 |
Bagherifam S, Brown TC, Fellows CM, Naidu R, 'Derivation methods of soils, water and sediments toxicity guidelines: A brief review with a focus on antimony', Journal of Geochemical Exploration, 205 (2019) [C1]
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Nova |
2019 |
Perera IA, Abinandan S, Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Advances in the technologies for studying consortia of bacteria and cyanobacteria/microalgae in wastewaters', CRITICAL REVIEWS IN BIOTECHNOLOGY, 39 709-731 (2019) [C1]
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Nova |
2018 |
Qi F, Kuppusamy S, Naidu R, Bolan NS, Ok YS, Lamb D, et al., 'Pyrogenic carbon and its role in contaminant immobilization in soils (vol 47, pg 795, 2017)', CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 48 535-535 (2018)
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2018 |
Cheng Y, Mallavarapu M, Naidu R, Chen Z, 'In situ fabrication of green reduced graphene-based biocompatible anode for efficient energy recycle', CHEMOSPHERE, 193 618-624 (2018) [C1]
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Nova |
2018 |
Saifullah, Dahlawi S, Naeem A, Rengel Z, Naidu R, 'Biochar application for the remediation of salt-affected soils: Challenges and opportunities', Science of the Total Environment, 625 320-335 (2018) [C1]
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Nova |
2018 |
Ganeshkumar V, Subashchandrabose SR, Dharmarajan R, Venkateswarlu K, Naidu R, Megharaj M, 'Use of mixed wastewaters from piggery and winery for nutrient removal and lipid production by Chlorella sp. MM3', BIORESOURCE TECHNOLOGY, 256 254-258 (2018) [C1]
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Nova |
2018 |
Panneerselvan L, Krishnan K, Subashchandrabose SR, Naidu R, Mallavarapu M, 'Draft Genome Sequence of Microbacterium esteraromaticum MM1, a Bacterium That Hydrolyzes the Organophosphorus Pesticide Fenamiphos, Isolated from Golf Course Soil', Microbiology Resource Announcements, 7 1-2 (2018) [C1]
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Nova |
2018 |
Biswas JK, Banerjee A, Rai M, Naidu R, Biswas B, Vithanage M, et al., 'Potential application of selected metal resistant phosphate solubilizing bacteria isolated from the gut of earthworm (Metaphire posthuma) in plant growth promotion', Geoderma, 330 117-124 (2018) [C1]
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Nova |
2018 |
Wijayawardena MAA, Biswas B, Qi F, Biswas JK, Khan MAI, Naidu R, 'The Fate of Chemical Pollutants with Soil Properties and Processes in the Climate Change Paradigm- a review', Soil Systems, 2 51-71 (2018) [C1]
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Nova |
2018 |
Khan MAI, Biswas B, Smith E, Naidu R, Megharaj M, 'Toxicity assessment of fresh and weathered petroleum hydrocarbons in contaminated soil- a review.', Chemosphere, 212 755-767 (2018) [C1]
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Nova |
2018 |
Singh G, Lakhi KS, Park D-H, Srivastava P, Naidu R, Vinu A, 'Facile One-Pot Synthesis of Activated Porous Biocarbons with a High Nitrogen Content for CO2 Capture', CHEMNANOMAT, 4 281-290 (2018) [C1]
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Nova |
2018 |
Shilpi S, Seshadri B, Sarkar B, Bolan N, Lamb D, Naidu R, 'Comparative values of various wastewater streams as a soil nutrient source', CHEMOSPHERE, 192 272-281 (2018) [C1]
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Nova |
2018 |
Sivaram AK, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Impact of plant photosystems in the remediation of benzo[a]pyrene and pyrene spiked soils', CHEMOSPHERE, 193 625-634 (2018) [C1]
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Nova |
2018 |
Espana VAA, Rodriguez Pinilla AR, Bardos P, Naidu R, 'Contaminated land in Colombia: A critical review of current status and future approach for the management of contaminated sites', SCIENCE OF THE TOTAL ENVIRONMENT, 618 199-209 (2018) [C1]
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Nova |
2018 |
Bekele DN, Naidu R, Chadalavada S, 'Development of a modular vapor intrusion model with variably saturated and non-isothermal vadose zone', Environmental Geochemistry and Health, 40 887-902 (2018) [C1]
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Nova |
2018 |
Subashchandrabose SR, Venkateswarlu K, Krishnan K, Naidu R, Lockington R, Megharaj M, 'Rhodococcus wratislaviensis strain 9: An efficient p-nitrophenol degrader with a great potential for bioremediation', JOURNAL OF HAZARDOUS MATERIALS, 347 176-183 (2018) [C1]
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Nova |
2018 |
Basak BB, Sarkar B, Sanderson P, Naidu R, 'Waste mineral powder supplies plant available potassium: Evaluation of chemical and biological interventions', JOURNAL OF GEOCHEMICAL EXPLORATION, 186 114-120 (2018) [C1]
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Nova |
2018 |
Sivaram AK, Logeshwaran P, Subashchandrabose SR, Lockington R, Naidu R, Megharaj M, 'Comparison of plants with C3 and C4 carbon fixation pathways for remediation of polycyclic aromatic hydrocarbon contaminated soils', SCIENTIFIC REPORTS, 8 (2018) [C1]
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Nova |
2018 |
Bahar MM, Mahbub KR, Naidu R, Megharaj M, 'As(V) removal from aqueous solution using a low-cost adsorbent coir pith ash: Equilibrium and kinetic study', Environmental Technology and Innovation, 9 198-209 (2018) [C1]
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Nova |
2018 |
Besha AT, Bekele DN, Naidu R, Chadalavada S, 'Recent advances in surfactant-enhanced In-Situ Chemical Oxidation for the remediation of non-aqueous phase liquid contaminated soils and aquifers', Environmental Technology and Innovation, 9 303-322 (2018) [C1]
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Nova |
2018 |
Biswas B, Sarkar B, Faustorilla MV, Naidu R, 'Effect of surface-tailored biocompatible organoclay on the bioavailability and mineralization of polycyclic aromatic hydrocarbons in long-term contaminated soil', Environmental Technology and Innovation, 10 152-161 (2018) [C1]
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Nova |
2018 |
Wijayawardena MAA, Megharaj M, Naidu R, Stojanovski E, 'Chronic and reproductive toxicity of cadmium, zinc, and lead in binary and tertiary mixtures to the earthworm (Eisenia fetida)', JOURNAL OF SOILS AND SEDIMENTS, 18 1602-1609 (2018) [C1]
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Nova |
2018 |
Perera I, Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Consortia of cyanobacteria/microalgae and bacteria in desert soils: an underexplored microbiota', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 102 7351-7363 (2018) [C1]
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Nova |
2018 |
Khan MAI, Biswas B, Smith E, Mahmud SA, Hasan NA, Khan MAW, et al., 'Microbial diversity changes with rhizosphere and hydrocarbons in contrasting soils.', Ecotoxicology and Environmental Safety, 156 434-442 (2018) [C1]
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Nova |
2018 |
Nookongbut P, Kantachote D, Megharaj M, Naidu R, 'Reduction in arsenic toxicity and uptake in rice (Oryza sativa L.) by As-resistant purple nonsulfur bacteria', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 25 36530-36544 (2018) [C1]
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Nova |
2018 |
Thangavadivel K, Ranganathan S, Sanderson P, Chadalavada S, Naidu R, Bowman M, 'Case study of testing heavy-particle concentrator-aided remediation of lead-contaminated rifle shooting range soil', Remediation, 28 67-74 (2018) [C1]
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Nova |
2018 |
Plunkett SA, Wijayawardena MAA, Naidu R, Siemering GS, Tomaszewski EJ, Ginder-Vogel M, Soldat DJ, 'Use of Routine Soil Tests to Estimate Pb Bioaccessibility', Environmental Science and Technology, 52 12556-12562 (2018) [C1]
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Nova |
2018 |
Umeh AC, Duan L, Naidu R, Semple KT, 'Comparison of Single- and Sequential-Solvent Extractions of Total Extractable Benzo[a]pyrene Fractions in Contrasting Soils', Analytical Chemistry, 90 11703-11709 (2018) [C1]
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Nova |
2018 |
Nguyen TC, Loganathan P, Nguyen TV, Kandasamy J, Naidu R, Vigneswaran S, 'Adsorptive removal of five heavy metals from water using blast furnace slag and fly ash', Environmental Science and Pollution Research, 25 20430-20438 (2018) [C1]
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Nova |
2018 |
Shahid M, Niazi NK, Dumat C, Naidu R, Khalid S, Rahman MM, Bibi I, 'A meta-analysis of the distribution, sources and health risks of arsenic-contaminated groundwater in Pakistan', Environmental Pollution, 242 307-319 (2018) [C1]
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Nova |
2018 |
Han F, Kambala VSR, Dharmarajan R, Liu Y, Naidu R, 'Photocatalytic degradation of azo dye acid orange 7 using
different light sources over Fe3+-doped TiO2 nanocatalysts', Environmental Technology and Innovation, 12 27-42 (2018) [C1]
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Nova |
2018 |
Yan K, Naidu R, Liu Y, Wijayawardena A, Duan L, Dong Z, 'A Pooled Data Analysis to Determine the Relationship between Selected Metals and Arsenic Bioavailability in Soil', International Journal of Environmental Research and Public Health, 15 (2018) [C1]
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Nova |
2018 |
Rashid MH, Rahman MM, Correll R, Naidu R, 'Arsenic and Other Elemental Concentrations in Mushrooms from Bangladesh: Health Risks.', International Journal of Environmental Research and Public Health, 15 (2018) [C1]
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Nova |
2018 |
Qi F, Lamb D, Naidu R, Bolan NS, Yan Y, Ok YS, et al., 'Cadmium solubility and bioavailability in soils amended with acidic and neutral biochar', SCIENCE OF THE TOTAL ENVIRONMENT, 610 1457-1466 (2018) [C1]
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Nova |
2018 |
Yu L, Duan L, Naidu R, Semple KT, 'Abiotic factors controlling bioavailability and bioaccessibility of polycyclic aromatic hydrocarbons in soil: Putting together a bigger picture', SCIENCE OF THE TOTAL ENVIRONMENT, 613 1140-1153 (2018) [C1]
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Nova |
2018 |
Fang C, Sobhani Z, Megharaj M, Naidu R, 'Electrochemical Proof of Fluorophilic Interaction Among Fluoro-Carbon Chains', Electroanalysis, 30 2349-2355 (2018) [C1]
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Nova |
2018 |
Umeh AC, Duan L, Naidu R, Semple KT, 'Enhanced Recovery of Nonextractable Benzo[a]pyrene Residues in Contrasting Soils Using Exhaustive Methanolic and Nonmethanolic Alkaline Treatments', Analytical Chemistry, 90 13104-13111 (2018) [C1]
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Nova |
2018 |
Umeh AC, Duan L, Naidu R, Semple KT, 'Time-Dependent Remobilisation of Non-Extractable Benzo[a]pyrene Residues in Contrasting Soils: Effects of Aging, Spiked Concentration, and Soil Properties.', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 52 12295-12305 (2018) [C1]
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Nova |
2018 |
Kader M, Lamb DT, Wang L, Megharaj M, Naidu R, 'Copper interactions on arsenic bioavailability and phytotoxicity in soil', Ecotoxicology and Environmental Safety, 148 738-746 (2018) [C1]
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Nova |
2018 |
Selvakumar R, Ramadoss G, Mridula PM, Rajendran K, Thavamani P, Ravi N, Megharaj M, 'Challenges and complexities in remediation of uranium contaminated soils: A review', Journal of Environmental Radioactivity, 192 592-603 (2018) [C1]
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Nova |
2018 |
Gao YC, Guo SH, Wang JN, Zhang W, Chen GH, Wang H, et al., 'Novel Bacillus cereus strain from electrokinetically remediated saline soil towards the remediation of crude oil', Environmental Science and Pollution Research, 25 26351-26360 (2018) [C1]
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Nova |
2018 |
Rocco C, Seshadri B, Adamo P, Bolan NS, Mbene K, Naidu R, 'Impact of waste-derived organic and inorganic amendments on the mobility and bioavailability of arsenic and cadmium in alkaline and acid soils', Environmental Science and Pollution Research, 25 25896-25905 (2018) [C1]
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Nova |
2018 |
Li Y, Li W, Xiao Q, Song S, Liu Y, Naidu R, 'Acid mine drainage remediation strategies: A review on migration and source controls', Minerals and Metallurgical Processing, 35 148-158 (2018) [C1]
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Nova |
2018 |
Nuruzzaman M, Liu Y, Rahman MM, Naidu R, Dharmarajan R, Shon HK, Woo YC, 'Core-Shell Interface-Oriented Synthesis of Bowl-Structured Hollow Silica Nanospheres Using Self-Assembled ABC Triblock Copolymeric Micelles.', Langmuir : the ACS journal of surfaces and colloids, 34 13584-13596 (2018) [C1]
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Nova |
2018 |
Sanderson P, Qi F, Seshadri B, Wijayawardena A, Naidu R, 'Contamination, Fate and Management of Metals in Shooting Range Soils - a Review', Current Pollution Reports, 4 175-187 (2018) [C1]
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Nova |
2018 |
Samarasinghe SVAC, Krishnan K, Naidu R, Megharaj M, Miller K, Fraser B, Aitken RJ, 'Parabens generate reactive oxygen species in human spermatozoa', ANDROLOGY, 6 532-541 (2018) [C1]
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Nova |
2018 |
Kumar M, Ramanathan AL, Mukherjee A, Verma S, Rahman MM, Naidu R, 'Hydrogeo-morphological influences for arsenic release and fate in the central Gangetic Basin, India', Environmental Technology and Innovation, 12 243-260 (2018) [C1]
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Nova |
2018 |
Shakoor MB, Bibi I, Niazi NK, Shahid M, Nawaz MF, Farooqi A, et al., 'The evaluation of arsenic contamination potential, speciation and hydrogeochemical behaviour in aquifers of Punjab, Pakistan', Chemosphere, 199 737-746 (2018) [C1]
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Nova |
2018 |
Hussain I, Aleti G, Naidu R, Puschenreiter M, Mahmood Q, Rahman MM, et al., 'Microbe and plant assisted-remediation of organic xenobiotics and its enhancement by genetically modified organisms and recombinant technology: A review', Science of the Total Environment, 628-629 1582-1599 (2018) [C1]
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Nova |
2018 |
Wang Z, Tan X, Lu G, Liu Y, Naidu R, He W, 'Soil properties influence kinetics of soil acid phosphatase in response to arsenic toxicity', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 147 266-274 (2018) [C1]
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Nova |
2018 |
Logeshwaran P, Megharaj M, Chadalavada S, Bowman M, Naidu R, 'Petroleum hydrocarbons (PH) in groundwater aquifers: An overview of environmental fate, toxicity, microbial degradation and risk-based remediation approaches', Environmental Technology & Innovation, 10 175-193 (2018) [C1]
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Nova |
2018 |
Kong L, Tian Y, Li N, Liu Y, Zhang J, Zhang J, Zuo W, 'Highly-effective phosphate removal from aqueous solutions by calcined nano-porous palygorskite matrix with embedded lanthanum hydroxide', APPLIED CLAY SCIENCE, 162 507-517 (2018) [C1]
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2018 |
Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Bioavailability of weathered hydrocarbons in engine oil-contaminated soil: Impact of bioaugmentation mediated by Pseudomonas spp. on bioremediation', Science of the Total Environment, 636 968-974 (2018) [C1]
Heavier fraction hydrocarbons (C15-C36) formed in soil after biotic and abiotic weatherings of engine oil are the continuing constraints in the bioremediation strategy, and their ... [more]
Heavier fraction hydrocarbons (C15-C36) formed in soil after biotic and abiotic weatherings of engine oil are the continuing constraints in the bioremediation strategy, and their bioavailability remains a poorly quantified regulatory factor. In a microcosm study, we used two strains of Pseudomonas, P. putida TPHK-1 and P. aeruginosa TPHK-4, in strategies of bioremediation, viz., natural attenuation, biostimulation and bioaugmentation, for removal of weathered total petroleum hydrocarbons (TPHs) in soil contaminated long-term with high concentrations of engine oil (39,000¿41,000 mg TPHs kg-1 soil). Both the bacterial strains exhibited a great potential in remediating weathered hydrocarbons of engine oil. Addition of inorganic fertilizers (NPK), at recommended levels for bioremediation, resulted in significant inhibition in biostimulation/enhanced natural attenuation as well as bioaugmentation. The data on dehydrogenase activity clearly confirmed those of bioremediation strategies used, indicating that this enzyme assay could serve as an indicator of bioremediation potential of oil-contaminated soil. Extraction of TPHs from engine oil-contaminated soil with hydroxypropyl-ß-cyclodextrin (HPCD), but not 1-butanol, was found reliable in predicting the bioavailability of weathered hydrocarbons. Also, 454 pyrosequencing data were in accordance with those of bioremediation strategies used in the present microcosm study, suggesting the possible use of pyrosequencing in designing approaches for bioremediation.
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Nova |
2018 |
Lu G, Tian H, Liu Y, Naidu R, Wang Z, He W, 'Using Qmsax* to evaluate the reasonable As(V) adsorption on soils with different pH', Ecotoxicology and Environmental Safety, 160 308-315 (2018) [C1]
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Nova |
2018 |
Desalegn B, Megharaj M, Chen Z, Naidu R, 'Green mango peel-nanozerovalent iron activated persulfate oxidation of petroleum hydrocarbons in oil sludge contaminated soil', Environmental Technology and Innovation, 11 142-152 (2018) [C1]
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Nova |
2018 |
Fang C, Zhang X, Dong Z, Wang L, Megharaj M, Naidu R, 'Smartphone app-based/portable sensor for the detection of fluoro-surfactant PFOA.', Chemosphere, 191 381-388 (2018) [C1]
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Nova |
2017 |
Qi F, Yan Y, Lamb D, Naidu R, Bolan NS, Liu Y, et al., 'Thermal stability of biochar and its effects on cadmium sorption capacity', BIORESOURCE TECHNOLOGY, 246 48-56 (2017) [C1]
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Nova |
2017 |
Chowdhury S, Thangarajan R, Bolan N, O'Reilly-Wapstra J, Kunhikrishnan A, Naidu R, 'Nitrification potential in the rhizosphere of Australian native vegetation', SOIL RESEARCH, 55 58-69 (2017) [C1]
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Nova |
2017 |
Kuppusamy S, Thavamani P, Singh S, Naidu R, Megharaj M, 'Polycyclic aromatic hydrocarbons (PAHs) degradation potential, surfactant production, metal resistance and enzymatic activity of two novel cellulose-degrading bacteria isolated from koala faeces', ENVIRONMENTAL EARTH SCIENCES, 76 (2017) [C1]
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Nova |
2017 |
Subashchandrabose SR, Wang L, Venkateswarlu K, Naidu R, Megharaj M, 'Interactive effects of PAHs and heavy metal mixtures on oxidative stress in Chlorella sp MM3 as determined by artificial neural network and genetic algorithm', ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS, 21 203-212 (2017) [C1]
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Nova |
2017 |
Mayilswami S, Krishnan K, Naidu R, Megharaj M, 'Transcriptome analysis of Eisenia fetida chronically exposed to benzo(a)pyrene', Environmental Technology & Innovation, 7 54-62 (2017) [C1]
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Nova |
2017 |
Thavamani P, Samkumar RA, Satheesh V, Subashchandrabose SR, Ramadass K, Naidu R, et al., 'Microbes from mined sites: Harnessing their potential for reclamation of derelict mine sites', Environmental Pollution, 230 495-505 (2017) [C1]
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Nova |
2017 |
Qi F, Kuppusamy S, Naidu R, Bolan NS, Ok YS, Lamb D, et al., 'Pyrogenic carbon and its role in contaminant immobilization in soils', CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 47 795-876 (2017) [C1]
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Nova |
2017 |
Karunanithi R, Sik Ok Y, Dharmarajan R, Ahmad M, Seshadri B, Bolan N, Naidu R, 'Sorption, kinetics and thermodynamics of phosphate sorption onto soybean stover derived biochar', Environmental Technology and Innovation, 8 113-125 (2017) [C1]
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Nova |
2017 |
Megharaj M, Naidu R, 'Soil and brownfield bioremediation', MICROBIAL BIOTECHNOLOGY, 10 1244-1249 (2017) [C1]
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Nova |
2017 |
Du J, Chadalavada S, Naidu R, 'Synthesis of porous bentonite organoclay granule and its adsorption of tributyltin', Applied Clay Science, 148 131-137 (2017) [C1]
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Nova |
2017 |
Mahbub KR, Bahar MM, Labbate M, Krishnan K, Andrews S, Naidu R, Megharaj M, 'Bioremediation of mercury: not properly exploited in contaminated soils!', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 101 963-976 (2017) [C1]
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Nova |
2017 |
Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Ecotoxicity of measured concentrations of soil-applied diesel: Effects on earthworm survival, dehydrogenase, urease and nitrification activities', Applied Soil Ecology, 119 1-7 (2017) [C1]
Diesel is an important petroleum product, and a common pollutant in soil caused by leaks and accidental spills. Studies dealing with the ecotoxicity of diesel towards earthworms a... [more]
Diesel is an important petroleum product, and a common pollutant in soil caused by leaks and accidental spills. Studies dealing with the ecotoxicity of diesel towards earthworms always relied on growth inhibition endpoint (EC50) values that were determined based on the spiked concentrations (nominal), ignoring the substantial portion of hydrocarbons volatilized from soil. In the present study we used, for the first time, the measured concentrations of total petroleum hydrocarbons (TPHs) from soil-applied diesel to assess earthworm (Eisenia fetida) survival, and the activities of dehydrogenase, urease and nitrification as indicators of soil health. The mortality endpoint (LC50) value for initially measured concentrations after exposure of earthworms to diesel for 28¿days was 916¿±¿10¿mg TPHs kg-1 soil which was equivalent to the nominal (initially added) concentration of 1426¿±¿19¿mg TPHs kg-1 soil. Morphological abnormalities such as clitella swelling and curling were noticed when the measured concentrations of diesel were more than 971¿mg¿kg-1 soil. Significant increases in activities of soil dehydrogenase (38¿58%) as well as urease were observed in the diesel-applied soil. Presence of earthworms further enhanced the activities of these soil enzymes. Nitrification was sensitive to application of diesel to soil, and it was inhibited in a dose-related manner even in the presence of earthworms. The differential response of the toxicity criteria to diesel-contaminated soil observed in the present study clearly warrants more studies involving several soil health parameters to arrive at a generalization of ecotoxicity of an environmental pollutant.
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Nova |
2017 |
Cheng Y, Wang L, Faustorilla V, Mallavarapu M, Naidu R, Chen Z, 'Integrated electrochemical treatment systems for facilitating the bioremediation of oil spill contaminated soil', Chemosphere, 175 294-299 (2017) [C1]
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Nova |
2017 |
Biswas B, Sarkar B, Naidu R, 'Bacterial mineralization of phenanthrene on thermally activated palygorskite: A C-14 radiotracer study', SCIENCE OF THE TOTAL ENVIRONMENT, 579 709-717 (2017) [C1]
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Nova |
2017 |
Islam S, Rahman MM, Islam MR, Naidu R, 'Effect of irrigation and genotypes towards reduction in arsenic load in rice', Science of the Total Environment, 609 311-318 (2017) [C1]
Arsenic (As) bioaccumulation in rice grains has been identified as a major problem in Bangladesh and many other parts of the world. Suitable rice genotypes along with proper water... [more]
Arsenic (As) bioaccumulation in rice grains has been identified as a major problem in Bangladesh and many other parts of the world. Suitable rice genotypes along with proper water management practice regulating As levels in rice plants must be chosen and implemented. A field study was conducted to investigate the effect of continuous flooding (CF) and alternate wetting and drying (AWD) irrigation on the bioaccumulation of As in ten rice cultivars at three locations having different levels of soil As and irrigation water As. Results showed that As concentration in different parts of rice plants varied significantly (P¿<¿0.0001) with rice genotypes and irrigation practices in the three study locations. Lower levels of As in rice were found in AWD irrigation practice compared to CF irrigation practice. Higher grain As bioaccumulation was detected in plants in areas of high soil As in combination with CF irrigation practice. Our data show that use of AWD irrigation practice with suitable genotypes led to 17 to 35% reduction in grain As level, as well as 7 to 38% increase in grain yield. Overall, this study advances our understanding that, for moderate to high levels of As contamination, the Binadhan-5, Binadhan-6, Binadhan-8, Binadhan-10 and BRRI dhan47 varieties were quite promising to mitigate As induced human health risk.
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Nova |
2017 |
Mahbub KR, Krishnan K, Andrews S, Venter H, Naidu R, Mallavarapu M, 'Bio-augmentation and nutrient amendment decrease concentration of mercury in contaminated soil', Science of the Total Environment, 576 303-309 (2017) [C1]
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Nova |
2017 |
Naidu R, Sanderson P, 'Novel risk-based approaches to derelict mine management', Journal of Health, Safety and Environment, 33 (2017) |
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2017 |
Biswas B, Chakraborty A, Sarkar B, Naidu R, 'Structural changes in smectite due to interaction with a biosurfactant-producing bacterium Pseudoxanthomonas kaohsiungensis', APPLIED CLAY SCIENCE, 136 51-57 (2017) [C1]
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Nova |
2017 |
Mahbub KR, Bahar MM, Labbate M, Krishnan K, Andrews S, Naidu R, Megharaj M, 'Bioremediation of mercury: not properly exploited in contaminated soils!', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 101 963-976 (2017) [C1]
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Nova |
2017 |
Biswas B, Sarkar B, Rusmin R, Naidu R, 'Mild acid and alkali treated clay minerals enhance bioremediation of polycyclic aromatic hydrocarbons in long-term contaminated soil: A C-14-tracer study', ENVIRONMENTAL POLLUTION, 223 255-265 (2017) [C1]
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Nova |
2017 |
Wang L, Cheng Y, Lamb D, Lesniewski P, Chen Z, Mallavarapu M, Naidu R, 'Novel recalibration methodologies for ion-selective electrode arrays in the multi-ion interference scenario', Journal of Chemometrics, 31 (2017) [C1]
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Nova |
2017 |
Faustorilla MV, Chen Z, Dharmarajan R, Naidu R, 'Determination of Total Petroleum Hydrocarbons in Australian Groundwater Through the Improvised Gas Chromatography-Flame Ionization Detection Technique', JOURNAL OF CHROMATOGRAPHIC SCIENCE, 55 775-783 (2017) [C1]
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Nova |
2017 |
Qi F, Dong Z, Lamb D, Naidu R, Bolan NS, Ok YS, et al., 'Effects of acidic and neutral biochars on properties and cadmium retention of soils', CHEMOSPHERE, 180 564-573 (2017) [C1]
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Nova |
2017 |
Yan K, Dong Z, Wijayawardena MAA, Liu Y, Naidu R, Semple K, 'Measurement of soil lead bioavailability and influence of soil types and properties: A review', CHEMOSPHERE, 184 27-42 (2017) [C1]
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Nova |
2017 |
Qi F, Naidu R, Bolan NS, Dong Z, Yan Y, Lamb D, et al., 'Pyrogenic carbon in Australian soils', SCIENCE OF THE TOTAL ENVIRONMENT, 586 849-857 (2017) [C1]
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Nova |
2017 |
Dong Z, Bahar MM, Jit J, Kennedy B, Priestly B, Ng J, et al., 'Issues raised by the reference doses for perfluorooctane sulfonate and perfluorooctanoic acid', ENVIRONMENT INTERNATIONAL, 105 86-94 (2017) [C1]
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Nova |
2017 |
Kuppusamy S, Venkateswarlu K, Thavamani P, Lee YB, Naidu R, Megharaj M, 'Quercus robur acorn peel as a novel coagulating adsorbent for cationic dye removal from aquatic ecosystems', ECOLOGICAL ENGINEERING, 101 3-8 (2017) [C1]
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Nova |
2017 |
Liu Y, Bello O, Rahman MM, Dong Z, Islam S, Naidu R, 'Investigating the relationship between lead speciation and bioaccessibility of mining impacted soils and dusts', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 24 17056-17067 (2017) [C1]
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Nova |
2017 |
Mahbub K, Krishnan K, Naidu R, Megharaj M, 'Development of a whole cell biosensor for the detection of inorganic mercury', Environmental Technology and Innovation, 8 64-70 (2017) [C1]
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Nova |
2017 |
Fang C, Megharaj M, Naidu R, 'Electrochemical Detection of Thioether-Based Fluorosurfactants in Aqueous Film-Forming Foam (AFFF)', Electroanalysis, 29 1095-1102 (2017) [C1]
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Nova |
2017 |
Fang C, Megharaj M, Naidu R, 'Electrochemical Studies on Self-Assembled Monolayer (SAM) Upon Exposure to Anionic Surfactants: PFOA, PFOS, SDS and SDBS', Electroanalysis, 29 2155-2160 (2017) [C1]
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Nova |
2017 |
Kalaruban M, Loganathan P, Kandasamy J, Naidu R, Vigneswaran S, 'Enhanced removal of nitrate in an integrated electrochemical-adsorption system', Separation and Purification Technology, 189 260-266 (2017) [C1]
The electrochemical (EC) method of removing pollutants in water is a widely used process in water and wastewater treatment. An EC-adsorption integrated system was investigated to ... [more]
The electrochemical (EC) method of removing pollutants in water is a widely used process in water and wastewater treatment. An EC-adsorption integrated system was investigated to test whether the simultaneous removal of nitrate by the two processes would be better than removal utilising the individual EC and adsorption methods. In the integrated system, an adsorbent (ion exchange resin - Dowex 21k XLT) was placed inside a stainless steel box that served as an anode with a Cu plate as cathode. In an experiment using 2 L nitrate solution containing 20 mg N/L and 2 g adsorbent the rate of nitrate removal in the integrated system was initially fast with 35% removed in 30 min, though slowing down later. The rate of removal increased with increasing current, voltage and pH up to 7 but decreased as the distance between the electrodes also increased. The optimum nitrate removal of 67% was obtained at pH 7, 1 A, and 31 V for a distance of 1 cm between the electrodes after 180 min. The amount of nitrate removed fell when sulphate was present in the integrated system due to sulphate competing with nitrate for adsorption. Concentration of ammonium produced by nitrate reduction in the EC system was reduced in the presence of adsorbent. Nitrate removal in the integrated system is approximately equal to the sum of the removals in the two individual processes.
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Nova |
2017 |
Sanderson P, Naidu R, Bolan N, 'Application of a biodegradable chelate to enhance subsequent chemical stabilisation of Pb in shooting range soils', JOURNAL OF SOILS AND SEDIMENTS, 17 1696-1705 (2017) [C1]
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Nova |
2017 |
Fang C, Megharaj M, Naidu R, 'Electrochemical switch on-off response of a self-assembled monolayer (SAM) upon exposure to perfluorooctanoic acid (PFOA)', JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 785 249-254 (2017) [C1]
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Nova |
2017 |
Islam S, Rahman MM, Rahman MA, Naidu R, 'Inorganic arsenic in rice and rice-based diets: Health risk assessment', Food Control, 82 196-202 (2017) [C1]
Total and inorganic arsenic (As) content in rice and rice-based diets (n = 59) obtained from supermarkets in South Australia were studied to investigate the contamination levels a... [more]
Total and inorganic arsenic (As) content in rice and rice-based diets (n = 59) obtained from supermarkets in South Australia were studied to investigate the contamination levels and whether consumption of these products pose potential health risks to young children and adults. Results show that of the 59 rice-based products, 31 (53%) exceeded the EU recommended value (100 µg/kg) of As for young children and 13 (22%) samples had higher than maximum level of 200 µg/kg recommended for adults. Arsenic content varies as rice crackers > baby rice > rice cakes > puffed rice > other rice-based snacks > ready-to-eat rice. Of the 6 categories of rice-based products, except ready-to-eat rice, all others exceeded the EU recommended value for young children. Even manufacture recommended servings deliver significant amounts (0.56¿6.87 µg) of inorganic As. These amounts are within the range of BMDL01 values indicated by the European Food Safety Authority (EFSA), which means the risk cannot be avoided for young children and adults considering the levels of total and inorganic As in rice-based products.
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Nova |
2017 |
Singh G, Lakhi KS, Kim IY, Kim S, Srivastava P, Naidu R, Vinu A, 'Highly Efficient Method for the Synthesis of Activated Mesoporous Biocarbons with Extremely High Surface Area for High-Pressure CO2 Adsorption.', ACS Applied Materials & Interfaces, 9 29782-29793 (2017) [C1]
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Nova |
2017 |
Khandaker Rayhan Mahbub, Krishnan K, Naidu R, Mallavarapu M, 'Mercury remediation potential of a mercury resistant strain Sphingopyxis sp. SE2 isolated from contaminated soil', Journal of Environmental Sciences, 51 128-137 (2017) [C1]
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Nova |
2017 |
Khandaker Rayhan Mahbub, Krishnan K, Naidu R, Megharaj M, 'Mercury toxicity to Eisenia fetida in three different soils', Environmental Science and Pollution Research, 24 1261-1269 (2017) [C1]
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Nova |
2017 |
Wijayawardena AMA, Megharaj M, Naidu R, 'Bioaccumulation and toxicity of lead, influenced by edaphic factors: using earthworms to study the effect of Pb on ecological health', Journal of Soils and Sediments, 17 1064-1072 (2017) [C1]
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Nova |
2017 |
Singh G, Kim IY, Lakhi KS, Srivastava P, Naidu R, Vinu A, 'Single step synthesis of activated bio-carbons with a high surface area and their excellent CO2 adsorption capacity', CARBON, 116 448-455 (2017) [C1]
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Nova |
2017 |
Bolan S, Kunhikrishnan A, Chowdhury S, Seshadri B, Naidu R, Ok YS, 'Comparative analysis of speciation and bioaccessibility of arsenic in rice grains and complementary medicines', CHEMOSPHERE, 182 433-440 (2017) [C1]
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Nova |
2017 |
Islam S, Rahman MM, Islam MR, Naidu R, 'Geographical variation and age-related dietary exposure to arsenic in rice from Bangladesh', Science of the Total Environment, 601-602 122-131 (2017) [C1]
An extensive number (965) of rice samples collected by household survey from 73 upazilas (i.e. sub-districts) in Bangladesh was analyzed to determine regional variation, distribut... [more]
An extensive number (965) of rice samples collected by household survey from 73 upazilas (i.e. sub-districts) in Bangladesh was analyzed to determine regional variation, distribution and associated health risks from arsenic (As). No previous study had conducted a study examining such a large number of rice samples. The mean and median concentrations of total As were 126¿µg/kg and 107¿µg/kg, respectively, ranging from between 3 and 680¿µg/kg. Importantly, total As levels of aromatic rice were significantly lower (average 58¿µg/kg) than non-aromatic rice (average 150¿µg/kg) and also varied with rice grain size. The variation in As content was dominated by the location (47% among the upazilas, 71% among districts) and rice variety (14%). Inorganic As content in rice grain ranged between 11 and 502¿µg/kg (n¿=¿162) with the highest fraction being 98.6%. The daily intake of inorganic As from rice ranged between 0.38 and 1.92¿µg/kg BW in different districts. The incremental lifetime cancer risk (ILCR) for individuals due to the consumption of rice varied between 0.57¿×¿10-¿3 to 2.88¿×¿10-¿3 in different districts, and 0.54¿×¿10-¿3 to 2.12¿×¿10-¿3 in different varieties, higher than the US EPA threshold. The 2¿10 age group experiences higher carcinogenic risks than others and females are more susceptible than males.
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Nova |
2017 |
Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Toxicity of diesel water accommodated fraction toward microalgae, Pseudokirchneriella subcapitata and Chlorella sp MM3', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 142 538-543 (2017) [C1]
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Nova |
2017 |
Mahbub KR, Krishnan K, Naidu R, Andrews S, Megharaj M, 'Mercury toxicity to terrestrial biota', ECOLOGICAL INDICATORS, 74 451-462 (2017) [C1]
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Nova |
2017 |
Subashchandrabose SR, Logeshwaran P, Venkateswarlu K, Naidu R, Megharaj M, 'Pyrene degradation by Chlorella sp MM3 in liquid medium and soil slurry: Possible role of dihydrolipoamide acetyltransferase in pyrene biodegradation', ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS, 23 223-232 (2017) [C1]
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Nova |
2017 |
Umeh AC, Duan L, Naidu R, Semple KT, 'Residual hydrophobic organic contaminants in soil: Are they a barrier to risk-based approaches for managing contaminated land?', ENVIRONMENT INTERNATIONAL, 98 18-34 (2017) [C1]
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Nova |
2017 |
Mandal S, Sarkar B, Bolan N, Ok YS, Naidu R, 'Enhancement of chromate reduction in soils by surface modified biochar', JOURNAL OF ENVIRONMENTAL MANAGEMENT, 186 277-284 (2017) [C1]
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Nova |
2017 |
Usese A, Chukwu OL, Rahman MM, Naidu R, Islam S, Oyewo EO, 'Concentrations of arsenic in water and fish in a tropical open lagoon, Southwest-Nigeria: Health risk assessment', Environmental Technology and Innovation, 8 164-171 (2017) [C1]
This study assesses the concentrations of arsenic (As) in water, muscle tissue of four demersal fish species (Chrysichthys nigrodigitatus, Mugil cephalus, Liza falcipinnis and Bat... [more]
This study assesses the concentrations of arsenic (As) in water, muscle tissue of four demersal fish species (Chrysichthys nigrodigitatus, Mugil cephalus, Liza falcipinnis and Bathygobious soporator) and whole tissues of periwinkle (Tympanotonus fuscatus) in Lagos Lagoon, Nigeria. The observed mean total As concentration in water (1.29µgl-1) during the wet and dry seasons did not exceed the World Health Organization (WHO) guideline value of 10µgl-1. Among the examined biota, Tympanotonus fuscatus recorded higher As levels (2.31±0.24mgkg-1) and Chrysichthys nigrodigitatus recorded the least As content (0.67±0.08mgkg-1). A significant positive correlation (p<0.05) was observed between As concentrations in fish muscles and water during the dry and wet seasons. The health risks associated with human consumption of fish estimated using Target Hazard Quotient (THQ) were lower than the USEPA guideline value of 1 for all fish species examined except in populations that consume larger amounts of fish. However, higher THQ values (>2) were obtained for Tympanotonus fuscatus, suggesting the potential for non-carcinogenic health outcomes in adults after a prolonged period of consumption. This calls for continuous monitoring and enforcement of regulations to ensure safety of fishery resources from Lagos Lagoon.
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Nova |
2017 |
Faustorilla V, Chen Z, Dharmarajan R, Naidu R, 'Improved method for the determination of polycyclic aromatic hydrocarbons in contaminated groundwater and soil samples at trace levels employing GC-MSD technique', Environmental Technology & Innovation, 8 218-232 (2017) [C1]
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Nova |
2017 |
Faustorilla MV, Dharmarajan R, Chen Z, Naidu R, 'Clean-up of the solid liquid extraction using certified reference material for soil TPH by GC-FID', Journal of Research Analytica, 3 81-87 (2017) [C1] |
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Nova |
2017 |
Biswas B, Sarkar B, McClure S, Naidu R, 'Modified osmium tracer technique enables precise microscopic delineation of hydrocarbon-degrading bacteria in clay aggregates', Environmental Technology and Innovation, 7 12-20 (2017) [C1]
Clay minerals can support bacterial proliferation, induce the formation of clay¿bacterial aggregates, and finally a clay-based biofilm. However, how these abiotic and biotic entit... [more]
Clay minerals can support bacterial proliferation, induce the formation of clay¿bacterial aggregates, and finally a clay-based biofilm. However, how these abiotic and biotic entities interact in a microhabitat is not fully understood. Visualization of the clay¿bacterial micro-aggregate under scanning electron microscope (SEM) and profiling the associated elemental signature through energy dispersive X-ray spectroscopy (EDS) can potentially unravel the mechanisms of a complex clay¿bacterial interaction. Osmium (Os) was used previously to enhance the visualization of microbial substances, but the delineation of bacterial cells from clay particles in a micro-aggregate was not tried before. In this study, bacterial cells in a clay¿bacterial aggregate (Burkholderia sartisoli with montmorillonite and kaolinite) were specifically stained with osmium (Os) which served as the EDS tracer of the biotic component of the interaction. Simultaneously silicon (Si) provided the signature of the clay minerals. X-ray elemental profiling (line and field mapping) successfully delineated the individual components of the clay¿bacterial aggregate. Thus, this study presented a simple Os-based SEM-EDS technique which could facilitate the microanalysis of bacterial microhabitat within a complex environmental substrate.
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Nova |
2017 |
Wijayawardena MAA, Naidu R, Megharaj M, Lamb D, Thavamani P, Kuchel T, 'Evaluation of relative bioaccessibility leaching procedure for an assessment of lead bioavailability in mixed metal contaminated soils', Environmental Technology and Innovation, 7 229-238 (2017) [C1]
This study investigates the effect of contaminant zinc (Zn) on lead (Pb) bioavailability and bioaccessibility in six contrasting soils spiked with 1500 mg Pb/kg and aged 12 months... [more]
This study investigates the effect of contaminant zinc (Zn) on lead (Pb) bioavailability and bioaccessibility in six contrasting soils spiked with 1500 mg Pb/kg and aged 12 months under laboratory conditions. Zn was added to the soils (7500 mgZn/kg soil) and aged for a further two weeks. In vivo studies were conducted using juvenile swine as a surrogate model for young children. Two compartment pharmacokinetic models were used to analyze the biological response produced by Pb oral solution and spiked soils. Absolute and relative bioavailability of Pb in soils (oral dose of 100 µ g Pb/kg body weight/day) were estimated by comparing them with intravenously administered soluble Pb salt (25 µ g Pb/kg/day) and orally administered the same Pb salt [Pb acetate =(CH3COO)2Pb·3H2O] administered to 3 juvenile pigs per treatment. Lead bioaccessibility was calculated using the in vitro RBALP (i.e. relative bioaccessibility leaching procedure) method. The in vitro results of RBALP were compared to in vivo relative Pb bioavailability to ascertain whether the changes in bioaccessibility correlated with the in vivo data. Although the in vivo Pb relative bioavailability (RB) in all soils except in MLA (Mount Lofty Acidic) revealed an increase (18%¿159%) in the presence of Zn, the in vitro RBALP bioaccessibility results indicated otherwise (1%¿38% decrease). In vivo RB of Pb in MLA declined by 37% in the presence of Zn. However, the RBALP in vitro bioaccessible Pb did not correlate with the relative bioavailabilities of Pb in the juvenile swine dosing experiment. Caution is therefore needed when predicting Pb bioavailability/bioaccessibility in the presence of metal mixtures. The literature contains much information on the correlation of metal and metalloid bioaccessibility with their bioavailability. There is, however, a paucity of studies investigating the effects of other metals on Pb and their IVIVC (in vitro and in vivo correlations). The current study addresses this knowledge gap by assessing in vivoand in vitro bioavailability of Pb in the presence of Zn.
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Nova |
2017 |
Usese A, Chukwu OL, Rahman MM, Naidu R, Islam S, Oyewo EO, 'Enrichment, contamination and geo-accumulation factors for assessing arsenic contamination in sediment of a Tropical Open Lagoon, Southwest Nigeria', Environmental Technology and Innovation, 8 126-131 (2017) [C1]
The presence of toxic heavy metals and metalloids in aquatic environments constitutes a major risk and there is an urgent need for continuous monitoring of such pollutants. This s... [more]
The presence of toxic heavy metals and metalloids in aquatic environments constitutes a major risk and there is an urgent need for continuous monitoring of such pollutants. This study assesses the concentrations of arsenic (As) in surface sediments from 15 locations on the Lagos Lagoon, Nigeria during the wet and dry seasons to determine the degree of contamination. The results showed that the mean total As concentration in sediment (2.44 mg kg-1 dry weight) did not exceed the Canadian Interim Sediment Quality Guideline (CISQG) value of 7.24 mg kg-1 dry weight during the wet and dry seasons. Based on the Sediment Quality Guidelines (SQGs) of the United States Environmental Protection Agency (USEPA) and ecological risk assessment using the enrichment factor (EF), contamination factor (CF) and geo-accumulation index (Igeo), the study's results indicate two things: firstly, low to moderate and significant levels of enrichment from As; and secondly, low to moderate degree of contamination in Lagos Lagoon during the study period.
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Nova |
2017 |
Rusmin R, Sarkar B, Tsuzuki T, Kawashima N, Naidu R, 'Removal of lead from aqueous solution using superparamagnetic palygorskite nanocomposite: Material characterization and regeneration studies', Chemosphere, 186 1006-1015 (2017) [C1]
A palygorskite-iron oxide nanocomposite (Pal-IO) was synthesized in situ by embedding magnetite into the palygorskite structure through co-precipitation method. The physico-chemic... [more]
A palygorskite-iron oxide nanocomposite (Pal-IO) was synthesized in situ by embedding magnetite into the palygorskite structure through co-precipitation method. The physico-chemical characteristics of Pal-IO and their pristine components were examined through various spectroscopic and micro-analytical techniques. Batch adsorption experiments were conducted to evaluate the performance of Pal-IO in removing Pb(II) from aqueous solution. The surface morphology, magnetic recyclability and adsorption efficiency of regenerated Pal-IO using desorbing agents HCl (Pal-IO-HCl) and ethylenediaminetetraacetic acid disodium salt (EDTA-Na2) (Pal-IO-EDTA) were compared. The nanocomposite showed a superparamagnetic property (magnetic susceptibility: 20.2 emu g-1) with higher specific surface area (99.8 m2 g-1) than the pristine palygorskite (49.4 m2 g-1) and iron oxide (72.6 m2 g-1). Pal-IO showed a maximum Pb(II) adsorption capacity of 26.6 mg g-1 (experimental condition: 5 g L-1 adsorbent loading, 150 agitations min-1, initial Pb(II) concentration from 20 to 500 mg L-1, at 25 °C) with easy separation of the spent adsorbent. The adsorption data best fitted to the Langmuir isotherm model (R2 = 0.9995) and pseudo-second order kinetic model (R2 = 0.9945). Pb(II) desorption using EDTA as the complexing agent produced no disaggregation of Pal-IO crystal bundles, and was able to preserve the composite's magnetic recyclability. Pal-IO-EDTA exhibited almost 64% removal capacity after three cycles of regeneration and preserved the nanocomposite's structural integrity and magnetic properties (15.6 emu g-1). The nanocomposite holds advantages as a sustainable material (easily separable and recyclable) for potential application in purifying heavy metal contaminated wastewaters.
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Nova |
2017 |
Kader M, Lamb DT, Wang L, Megharaj M, Naidu R, 'Zinc-arsenic interactions in soil: Solubility, toxicity and uptake', Chemosphere, 187 357-367 (2017) [C1]
Arsenic (As) and zinc (Zn) are common co-contaminants in mining impacted soils. Their interaction on solubility and toxicity when present concurrently is not well understood in na... [more]
Arsenic (As) and zinc (Zn) are common co-contaminants in mining impacted soils. Their interaction on solubility and toxicity when present concurrently is not well understood in natural systems. The aim of this study was to observe their interaction in solubility (soil-solution), bioaccumulation (shoot uptake) and toxicity to cucumber (Cucumis sativa L) conducting 4 weeks pot study in 5 different soils spiked with As (0, 2, 4, 8 to 1024 mg kg-1) individually and with Zn at two phytotoxic doses. The As pore-water concentration was significantly reduced (df = 289, Adjusted R2 = 0.84, p < 0.01) in the presence of Zn in the whole dataset, whereas Zn and Zn2+ activity in pore-water was reduced significantly only in the two alkaline soils. This outcome may be due to adsorption/surface precipitation or tertiary bridging complexation. No homogenous precipitation of zinc arsenate could be established using electron microscopy, XRD or even equilibrium calculations. For bioaccumulation phase, no significant effect of Zn on As uptake was observed except acidic MG soil whereas, Zn uptake was significantly reduced (p < 0.05) by As in whole dataset. However, an additive response was observed mostly except acidic MG soil. The synergistic response (more than additive) was predominant in this soil for a wide range of inhibition concentration (0¿80%) at both Zn EC10 and EC50 levels. Since additive response is mostly considered in risk assessment for mixtures, precautions should be implemented for assessment of toxicity for As-Zn mixture in acidic soil due to their synergistic response in some soils.
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Nova |
2017 |
Fang C, Megharaj M, Naidu R, 'Electrochemical Advanced Oxidation Processes (EAOP) to degrade per- and polyflluoroalkyl substances (PFASs)', JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES, 20 (2017) [C1]
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Nova |
2017 |
Singh G, Kim IY, Lakhi KS, Joseph S, Srivastava P, Naidu R, Vinu A, 'Heteroatom functionalized activated porous biocarbons and their excellent performance for CO2 capture at high pressure', JOURNAL OF MATERIALS CHEMISTRY A, 5 21196-21204 (2017)
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2017 |
Kuppusamy S, Thavamani P, Venkateswarlu K, Lee YB, Naidu R, Megharaj M, 'Remediation approaches for polycyclic aromatic hydrocarbons (PAHs) contaminated soils: Technological constraints, emerging trends and future directions', CHEMOSPHERE, 168 944-968 (2017) [C1]
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Nova |
2017 |
Faustorilla MV, Dharmarajan R, Chen Z, Naidu R, 'Fractionation of total petroleum hydrocarbons in soil by SPE-GC for toxicity studies to Eisenia fetida', Journal of Chromatography & Separation Techniques, 8 44-44 (2017)
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2017 |
Mahbub KR, Subashchandrabose SR, Krishnan K, Naidu R, Megharaj M, 'Mercury alters the bacterial community structure and diversity in soil even at concentrations lower than the guideline values', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 101 2163-2175 (2017) [C1]
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Nova |
2017 |
Fang C, Dharmarajan R, Mallavarapu M, Naidu R, 'Gold nanoparticle-based optical sensors for selected anionic contaminants', Trends in Analytical Chemistry, 86 143-154 (2017) [C1]
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Nova |
2017 |
Matheyarasu R, Sheshadri B, Bolan NS, Naidu R, 'Nutrient Budgeting as an Approach to Assess and Manage the Impacts of Long-Term Irrigation Using Abattoir Wastewater', WATER AIR AND SOIL POLLUTION, 228 (2017) [C1]
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Nova |
2017 |
Mahbub KR, Kader M, Krishnan K, Labbate M, Naidu R, Megharaj M, 'Toxicity of Inorganic Mercury to Native Australian Grass Grown in Three Different Soils', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 98 850-855 (2017) [C1]
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Nova |
2017 |
Bolan S, Kunhikrishnan A, Seshadri B, Choppala G, Naidu R, Bolan NS, et al., 'Sources, distribution, bioavailability, toxicity, and risk assessment of heavy metal(loid)s in complementary medicines', ENVIRONMENT INTERNATIONAL, 108 103-118 (2017) [C1]
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Nova |
2017 |
Islam S, Rahman MM, Duan L, Islam MR, Kuchel T, Naidu R, 'Variation in arsenic bioavailability in rice genotypes using swine model: An animal study', SCIENCE OF THE TOTAL ENVIRONMENT, 599 324-331 (2017) [C1]
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Nova |
2016 |
Mahbub K, Krishnan, Mallavarapu, Naidu, 'Mercury Inhibits Soil Enzyme Activity in a Lower Concentration than the Guideline Value', Bulletin of Environmental Contamination and Toxicology, 96 76-82 (2016) [C1]
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Nova |
2016 |
Venkidusamy K, Megharaj M, Marzorati M, Lockington R, Naidu R, 'Enhanced removal of petroleum hydrocarbons using a bioelectrochemical remediation system with pre-cultured anodes', Science of the Total Environment, 539 61-69 (2016) [C1]
Bioelectrochemical remediation (BER) systems such as microbial fuel cells (MFCs) have recently emerged as a green technology for the effective remediation of petroleum hydrocarbon... [more]
Bioelectrochemical remediation (BER) systems such as microbial fuel cells (MFCs) have recently emerged as a green technology for the effective remediation of petroleum hydrocarbon contaminants (PH) coupled with simultaneous energy recovery. Recent research has shown that biofilms previously enriched for substrate degrading bacteria resulted in excellent performance in terms of substrate removal and electricity generation but the effects on hydrocarbon contaminant degradation were not examined. Here we investigate the differences between enriched biofilm anodes and freshly inoculated new anodes in diesel fed single chamber mediatorless microbial fuel cells (DMFC) using various techniques for the enhancement of PH contaminant remediation with concomitant electricity generation. An anodophilic microbial consortium previously selected for over a year through continuous culturing with a diesel concentration of about 800mgl<sup>-1</sup> and which now showed complete removal of this concentration of diesel within 30days was compared to that of a freshly inoculated new anode MFC (showing 83.4% removal of diesel) with a simultaneous power generation of 90.81mW/m<sup>2</sup> and 15.04mW/m<sup>2</sup> respectively. The behaviour of pre-cultured anodes at a higher concentration of PH (8000mgl<sup>-1</sup>) was also investigated. Scanning electron microscopy observation revealed a thick biofilm covering the pre-cultured anodic electrode but not the anode from the freshly inoculated MFC. High resolution imaging showed the presence of thin 60nm diametre pilus-like projections emanating from the cells. Anodic microbial community profiling confirmed that the selection for diesel degrading exoelectrogenic bacteria had occurred. Identification of a biodegradative gene (alkB) provided strong evidence of the catabolic pathway used for diesel degradation in the DMFCs.
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Nova |
2016 |
Naidu R, Arias V, Liu Y, Jit J, 'Emerging contaminants in the environment: Risk-based analysis for better management', Chemosphere, 154 350-357 (2016) [C1]
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Nova |
2016 |
Subramaniyam V, Subashchandrabose SR, Thavamani P, Chen Z, Krishnamurti GSR, Naidu R, Megharaj M, 'Toxicity and bioaccumulation of iron in soil microalgae', Journal of Applied Phycology, 28 2767-2776 (2016) [C1]
Microalgae are extensively used in the remediation of heavy metals like iron. However, factors like toxicity, bioavailability and iron speciation play a major role in its removal ... [more]
Microalgae are extensively used in the remediation of heavy metals like iron. However, factors like toxicity, bioavailability and iron speciation play a major role in its removal by microalgae. Thus, in this study, toxicity of three different iron salts (FeSO4, FeCl3 and Fe(NO3)3) was evaluated towards three soil microalgal isolates, Chlorella sp. MM3, Chlamydomonas sp. MM7 and Chlorococcum sp. MM11. Interestingly, all the three iron salts gave different EC50 concentrations; however, ferric nitrate was found to be significantly more toxic followed by ferrous sulphate and ferric chloride. The EC50 analysis revealed that Chlorella sp. was significantly resistant to iron compared to other microalgae. However, almost 900¿µg¿g-1 iron was accumulated by Chlamydomonas sp. grown with 12¿mg¿L-1 ferric nitrate as an iron source when compared to other algae and iron salts. The time-course bioaccumulation confirmed that all the three microalgae adsorb the ferric salts such as ferric nitrate and ferric chloride more rapidly than ferrous salt, whereas intracellular accumulation was found to be rapid for ferrous salts. However, the amount of iron accumulated or adsorbed by algae, irrespective of species, from ferrous sulphate medium is comparatively lower than ferric chloride and ferric nitrate medium. The Fourier transform infrared spectroscopy (FTIR) analysis shows that the oxygen atom and P = O group of polysaccharides present in the cell wall of algae played a major role in the bioaccumulation of iron ions by algae.
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Nova |
2016 |
Biswas B, Sarkar B, Mandal A, Naidu R, 'Specific adsorption of cadmium on surface-engineered biocompatible organoclay under metal-phenanthrene mixed-contamination', WATER RESEARCH, 104 119-127 (2016) [C1]
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Nova |
2016 |
Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'Characterization of bimetallic Fe/Pd nanoparticles by grape leaf aqueous extract and identification of active biomolecules involved in the synthesis', SCIENCE OF THE TOTAL ENVIRONMENT, 562 526-532 (2016) [C1]
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2016 |
Nirola R, Megharaj M, Saint C, Aryal R, Thavamani P, Venkateswarlu K, et al., 'Metal bioavailability to Eisenia fetida through copper mine dwelling animal and plant litter, a new challenge on contaminated environment remediation', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, 113 208-216 (2016) [C1]
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Nova |
2016 |
Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Lee YB, Naidu R, 'Oak (Quercus robur) Acorn Peel as a Low-Cost Adsorbent for Hexavalent Chromium Removal from Aquatic Ecosystems and Industrial Effluents', Water, Air, and Soil Pollution, 227 (2016) [C1]
The efficiency of low-cost, abundantly available local forestry waste, oak (Quercus robur) acorn peel (OP), to remove toxic Cr(VI) from aqueous solutions was studied in a batch sy... [more]
The efficiency of low-cost, abundantly available local forestry waste, oak (Quercus robur) acorn peel (OP), to remove toxic Cr(VI) from aqueous solutions was studied in a batch system as a function of contact time, adsorbate concentration, adsorbent dosage, and pH. In an equilibrium time of 420 min, the maximum Cr removal by OP at pH 2 and 10 was 100 and 97 %, respectively. The sorption data fitted well with Langmuir adsorption model. Evaluation using Langmuir expression presented a monolayer sorption capacity of 47.39 mg g-1 with an equilibrium sorbent dose of 5 g L-1 and pH 7. Uptake of Cr by OP was described by pseudo-second-order chemisorption model. ICP-OES, LC-ICPMS analysis of the aqueous and solid phases revealed that the mechanism of Cr(VI) removal is by 'integrated adsorption and reduction' mechanism. ESEM-EDX and XRD analysis of OP before and after adsorption also confirmed that both adsorption and reduction of Cr(VI) to less toxic Cr3+ forms followed by complexation onto the adsorbent surface contributed to the removal of Cr(VI). Consistent with batch studies, OP effectively removed (>95 %) Cr from the real water samples collected from lake and sea. The results of this study illustrate that OP could be an economical, green, and effective biomaterial for Cr(VI) removal from natural aquatic ecosystems and industrial effluents.
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Nova |
2016 |
Mahbub KR, Krishnan K, Megharaj M, Naidu R, 'Bioremediation potential of a highly mercury resistant bacterial strain Sphingobium SA2 isolated from contaminated soil', Chemosphere, 144 330-337 (2016) [C1]
A mercury resistant bacterial strain, SA2, was isolated from soil contaminated with mercury. The 16S rRNA gene sequence of this isolate showed 99% sequence similarity to the gener... [more]
A mercury resistant bacterial strain, SA2, was isolated from soil contaminated with mercury. The 16S rRNA gene sequence of this isolate showed 99% sequence similarity to the genera Sphingobium and Sphingomonas of a-proteobacteria group. However, the isolate formed a distinct phyletic line with the genus Sphingobium suggesting the strain belongs to Sphingobium sp. Toxicity studies indicated resistance to high levels of mercury with estimated EC50 values 4.5 mg L-1 and 44.15 mg L-1 and MIC values 5.1 mg L-1 and 48.48 mg L-1 in minimal and rich media, respectively. The strain SA2 was able to volatilize mercury by producing mercuric reductase enzyme which makes it potential candidate for remediating mercury. ICP-QQQ-MS analysis of Hg supplemented culture solutions confirmed that almost 79% mercury in the culture suspension was volatilized in 6 h. A very small amount of mercury was observed to accumulate in cell pellets which was also evident according to ESEM-EDX analysis. The mercuric reductase gene merA was amplified and sequenced. The deduced amino acid sequence demonstrated sequence homology with a-proteobacteria and Ascomycota group.
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Nova |
2016 |
Dong Z, Yan K, Liu Y, Naidu R, Duan L, Wijayawardena A, et al., 'A meta-analysis to correlate lead bioavailability and bioaccessibility and predict lead bioavailability', Environment International, 92-93 139-145 (2016) [C1]
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Nova |
2016 |
Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Lee YB, Naidu R, 'Pyrosequencing analysis of bacterial diversity in soils contaminated long-term with PAHs and heavy metals: Implications to bioremediation', Journal of Hazardous Materials, 317 169-179 (2016) [C1]
Diversity, distribution and composition of bacterial community of soils contaminated long-term with both polycyclic aromatic hydrocarbons (PAHs) and heavy metals were explored for... [more]
Diversity, distribution and composition of bacterial community of soils contaminated long-term with both polycyclic aromatic hydrocarbons (PAHs) and heavy metals were explored for the first time following 454 pyrosequencing. Strikingly, the complete picture of the Gram positive (+ve) and Gram negative (-ve) bacterial profile obtained in our study illustrates novel postulates that include: (1) Metal-tolerant and PAH-degrading Gram -ves belonging to the class Alphaproteobacteria persist relatively more in the real contaminated sites compared to Gram +ves, (2) Gram +ves are not always resistant to heavy metal toxicity, (3) Stenotrophomonas followed by Burkholderia and Pseudomonas are the dominant genera of PAH degraders with high metabolic activity in long-term contaminated soils, (4) Actinobacteria is the predominant group among the Gram +ves in soils contaminated with high molecular weight PAHs that co-exist with toxic heavy metals like Pb, Cu and Zn, (5) Microbial communities are nutrient-driven in natural environments and (6) Catabolically potential Gram +/-ves with diverse applicability to remediate the real contaminated sites evolve eventually in the historically-polluted soils. Thus, the most promising indigenous Gram +/-ve strains from the long-term contaminated sites with increased catabolic potential, enzymatic activity and metal tolerance need to be harnessed for mixed contaminant cleanups.
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Nova |
2016 |
Mayilswami S, Krishnan K, Megharaj M, Naidu R, 'Gene expression profile changes in Eisenia fetida chronically exposed to PFOA', Ecotoxicology, 25 759-769 (2016) [C1]
Eisenia fetida is a terrestrial organism, which can be used to diagnose sub-lethal concentrations of PFOA by using molecular biomarkers. In order to identify potential molecular b... [more]
Eisenia fetida is a terrestrial organism, which can be used to diagnose sub-lethal concentrations of PFOA by using molecular biomarkers. In order to identify potential molecular biomarkers, we have exposed E.¿fetida to 10¿mg/kg of PFOA in soil for 8¿months. The mRNA isolation, sequencing, transcriptome assembly followed by differential gene expression studies have revealed that genes that are involved in apoptotic process, reproduction, calcium signalling, neuronal development and lipid metabolism are predominantly affected. Highly specific genes that are altered by PFOA can be further validated and used as biomarker to detect sub-lethal concentrations of PFOA in the soil.
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Nova |
2016 |
Dong Z, Liu CX, Liu Y, Yan K, Semple KT, Naidu R, 'Using publicly available data, a physiologically-based pharmacokinetic model and Bayesian simulation to improve arsenic non-cancer dose-response', Environment International, 92-93 239-246 (2016) [C1]
Publicly available data can potentially examine the relationship between environmental exposure and public health, however, it has not yet been widely applied. Arsenic is of envir... [more]
Publicly available data can potentially examine the relationship between environmental exposure and public health, however, it has not yet been widely applied. Arsenic is of environmental concern, and previous studies mathematically parameterized exposure duration to create a link between duration of exposure and increase in risk. However, since the dose metric emerging from exposure duration is not a linear or explicit variable, it is difficult to address the effects of exposure duration simply by using mathematical functions. To relate cumulative dose metric to public health requires a lifetime physiologically-based pharmacokinetic (PBPK) model, yet this model is not available at a population level. In this study, the data from the U.S. total diet study (TDS, 2006-2011) was employed to assess exposure: daily dietary intakes for total arsenic (tAs) and inorganic arsenic (iAs) were estimated to be 0.15 and 0.028 µg/kg/day, respectively. Meanwhile, using National Health and Nutrition Examination Survey (NHANES, 2011-2012) data, the fraction of urinary As(III) levels (geometric mean: 0.31 µg/L) in tAs (geometric mean: 7.75 µg/L) was firstly reported to be approximately 4%. Together with Bayesian technique, the assessed exposure and urinary As(III) concentration were input to successfully optimize a lifetime population PBPK model. Finally, this optimized PBPK model was used to derive an oral reference dose (Rfd) of 0.8 µg/kg/day for iAs exposure. Our study also suggests the previous approach (by using mathematical functions to account for exposure duration) may result in a conservative Rfd estimation.
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Nova |
2016 |
Kumar M, Rahman MM, Ramanathan AL, Naidu R, 'Arsenic and other elements in drinking water and dietary components from the middle Gangetic plain of Bihar, India: Health risk index', Science of the Total Environment, 539 125-134 (2016) [C1]
This study investigates the level of contamination and health risk assessment for arsenic (As) and other elements in drinking water, vegetables and other food components in two bl... [more]
This study investigates the level of contamination and health risk assessment for arsenic (As) and other elements in drinking water, vegetables and other food components in two blocks (Mohiuddinagar and Mohanpur) from the Samastipur district, Bihar, India. Groundwater (80%) samples exceeded the World Health Organization (WHO) guideline value (10. µg/L) of As while Mn exceeded the previous WHO limit of 400. µg/L in 28% samples. The estimated daily intake of As, Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn from drinking water and food components were 169, 19, 26, 882, 4645, 14582, 474, 1449 and 12,955. µg, respectively (estimated exposure 3.70, 0.41, 0.57, 19.61, 103.22, 324.05, 10.53, 32.21 and 287.90. µg per kg bw, respectively). Twelve of 15 cooked rice contained high As concentration compared to uncooked rice. Water contributes (67%) considerable As to daily exposure followed by rice and vegetables. Whereas food is the major contributor of other elements to the dietary exposure. Correlation and principal component analysis (PCA) indicated natural source for As but for other elements, presence of diffused anthropogenic activities were responsible. The chronic daily intake (CDI) and health risk index (HRI) were also estimated from the generated data. The HRI were >. 1 for As in drinking water, vegetables and rice, for Mn in drinking water, vegetables, rice and wheat, for Pb in rice and wheat indicated the potential health risk to the local population. An assessment of As and other elements of other food components should be conducted to understand the actual health hazards caused by ingestion of food in people residing in the middle Gangetic plain.
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2016 |
Bolan S, Naidu R, Kunhikrishnan A, Seshadri B, Ok YS, Palanisami T, et al., 'Speciation and bioavailability of lead in complementary medicines', Science of the Total Environment, 539 304-312 (2016) [C1]
Complementary medicines have associated risks which include toxic heavy metal(loid) and pesticide contamination. The objective of this study was to examine the speciation and bioa... [more]
Complementary medicines have associated risks which include toxic heavy metal(loid) and pesticide contamination. The objective of this study was to examine the speciation and bioavailability of lead (Pb) in selected complementary medicines. Six herbal and six ayurvedic medicines were analysed for: (i) total heavy metal(loid) contents including arsenic (As), cadmium (Cd), Pb and mercury (Hg); (ii) speciation of Pb using sequential fractionation and extended x-ray absorption fine structure (EXAFS) techniques; and (iii) bioavailability of Pb using a physiologically-based in vitro extraction test (PBET). The daily intake of Pb through the uptake of these medicines was compared with the safety guidelines for Pb. The results indicated that generally ayurvedic medicines contained higher levels of heavy metal(loid)s than herbal medicines with the amount of Pb much higher than the other metal(loid)s. Sequential fractionation indicated that while organic-bound Pb species dominated the herbal medicines, inorganic-bound Pb species dominated the ayurvedic medicines. EXAFS data indicated the presence of various Pb species in ayurvedic medicines. This implies that Pb is derived from plant uptake and inorganic mineral input in herbal and ayurvedic medicines, respectively. Bioavailability of Pb was higher in ayurvedic than herbal medicines, indicating that Pb added as a mineral therapeutic input is more bioavailable than that derived from plant uptake. There was a positive relationship between soluble Pb fraction and bioavailability indicating that solubility is an important factor controlling bioavailability. The daily intake values for Pb as estimated by total and bioavailable metal(loid) contents are likely to exceed the safe threshold level in certain ayurvedic medicines. This research demonstrated that Pb toxicity is likely to result from the regular intake of these medicines which requires further investigation.
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2016 |
Abbasian F, Lockington R, Palanisami T, Megharaj M, Naidu R, 'Multiwall carbon nanotubes increase the microbial community in crude oil contaminated fresh water sediments', Science of the Total Environment, 539 370-380 (2016) [C1]
Since crude oil contamination is one of the biggest environmental concerns, its removal from contaminated sites is of interest for both researchers and industries. In situ bioreme... [more]
Since crude oil contamination is one of the biggest environmental concerns, its removal from contaminated sites is of interest for both researchers and industries. In situ bioremediation is a promising technique for decreasing or even eliminating crude oil and hydrocarbon contamination. However, since these compounds are potentially toxic for many microorganisms, high loads of contamination can inhibit the microbial community and therefore reduce the removal rate. Therefore, any strategy with the ability to increase the microbial population in such circumstances can be of promise in improving the remediation process. In this study, multiwall carbon nanotubes were employed to support microbial growth in sediments contaminated with crude oil. Following spiking of fresh water sediments with different concentrations of crude oil alone and in a mixture with carbon nanotubes for 30. days, the microbial profiles in these sediments were obtained using FLX-pyrosequencing. Next, the ratios of each member of the microbial population in these sediments were compared with those values in the untreated control sediment. This study showed that combination of crude oil and carbon nanotubes can increase the diversity of the total microbial population. Furthermore, these treatments could increase the ratios of several microorganisms that are known to be effective in the degradation of hydrocarbons.
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2016 |
Yirsaw BD, Mayilswami S, Megharaj M, Chen Z, Naidu R, 'Effect of zero valent iron nanoparticles to Eisenia fetida in three soil types', Environmental Science and Pollution Research, 23 9822-9831 (2016) [C1]
In this study, the influence of soil types on the effect of the commercial form of C-nZVI on tissue concentrations, cellular component, reproduction outcome in Eisenia fetida, and... [more]
In this study, the influence of soil types on the effect of the commercial form of C-nZVI on tissue concentrations, cellular component, reproduction outcome in Eisenia fetida, and the soil health was investigated. C-nZVI at concentration level of 3¿g¿kg-1 soil showed no effect on the survival of E. fetida in the three soil types. However, varying effects such as concentration-dependent increase in tissue iron concentration, lipid peroxidation, and damage to DNA molecules by C-nZVI were observed. C-nZVI at an exposure concentration of 60¿mg¿kg-1 soil induced oxidative stress in E. fetida. Tissue Fe concentration appeared correlated to the DNA damage. Oxidative stress and DNA damage may explain the toxicity mechanisms of nZVI to E. fetida. [Figure not available: see fulltext.].
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2016 |
Nirola R, Megharaj M, Aryal R, Naidu R, 'Screening of metal uptake by plant colonizers growing on abandoned copper mine in Kapunda, South Australia', International Journal of Phytoremediation, 18 399-405 (2016) [C1]
© 2016, © Taylor & Francis Group, LLC.Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu) mine at Kapunda, South Australia. Cu co... [more]
© 2016, © Taylor & Francis Group, LLC.Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu) mine at Kapunda, South Australia. Cu concentrations in the soils at this former mine ranged from 65¿10107¿mg kg-1. The pH and EC varied widely in the 3.9¿8.4 and 152¿7311¿µS ranges, respectively. Nine plant species growing over the copper mine site were selected to screen for metal uptake to determine their suitability for phytoremediation. The Australian native tree species Eucalyptus camaldulensis indicated enrichment factor (EF) of 2.17, 1.89, and 1.30 for Cu, Zn, and Pb, respectively, suggesting that this species of tree can accumulate these metals to some degree. The stress-resistant exotic olive, Olea europaea exhibited EF of = 0.01 for Cu, Cd, and Pb, and 0.29 for Zn, which is characteristic of an excluder plant. Acacia pycnantha, the Australian pioneer legume species with EF 0.03, 0.80, 0.32, and 0.01 for Cu, Zn, Cd, and Pb, respectively, emerged as another strong metal excluder and consequently as an ideal metal stabilizer.
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2016 |
Abbasian F, Palanisami T, Megharaj M, Naidu R, Lockington R, Ramadass K, 'Microbial diversity and hydrocarbon degrading gene capacity of a crude oil field soil as determined by metagenomics analysis', Biotechnology Progress, 32 638-648 (2016) [C1]
© 2016 American Institute of Chemical Engineers Soils contaminated with crude oil are rich sources of enzymes suitable for both degradation of hydrocarbons through bioremediation ... [more]
© 2016 American Institute of Chemical Engineers Soils contaminated with crude oil are rich sources of enzymes suitable for both degradation of hydrocarbons through bioremediation processes and improvement of crude oil during its refining steps. Due to the long term selection, crude oil fields are unique environments for the identificati on of microorganisms with the ability to produce these enzymes. In this metagenomic study, based on Hiseq Illumina sequencing of samples obtained from a crude oil field and analysis of data on MG-RAST, Actinomycetales (9.8%) were found to be the dominant microorganisms, followed by Rhizobiales (3.3%). Furthermore, several functional genes were found in this study, mostly belong to Actinobacteria (12.35%), which have a role in the metabolism of aliphatic and aromatic hydrocarbons (2.51%), desulfurization (0.03%), element shortage (5.6%), and resistance to heavy metals (1.1%). This information will be useful for assisting in the application of microorganisms in the removal of hydrocarbon contamination and/or for improving the quality of crude oil. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:638¿648, 2016.
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2016 |
Luo F, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of trichloroethylene and hexavalent chromium by green synthesized agarose-Fe nanoparticles hydrogel', Chemical Engineering Journal, 294 290-297 (2016) [C1]
The development of highly efficient, eco-friendly and cost-effective remediation technology to remove mixed contaminants is now in progress. Here, agarose-Fe nanoparticles (NPs) h... [more]
The development of highly efficient, eco-friendly and cost-effective remediation technology to remove mixed contaminants is now in progress. Here, agarose-Fe nanoparticles (NPs) hydrogel were produced via two green steps to remove mixed contaminants, specifically trichloroethylene (TCE) and hexavalent chromium (Cr(VI)). Approx. 84.9% of Cr(VI) and 93.8% of TCE were simultaneously removed over 24 h in their co-existing solution, while 94.1% of Cr(VI) and 97.2% of TCE were separately removed by agarose-Fe NPs hydrogel. Scanning Electron Microscopy (SEM) suggested that the macroporosity of agarose-Fe NPs hydrogel facilitated the mass transfer between agarose-Fe NPs hydrogels and mixed contaminants, and that Fe NPs were uniformly immobilized into the hydrogel. X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) provided evidence supporting the co-removal mechanism. XPS result indicated that: (1) chemical reduction played a role in the removal of both Cr(VI) and TCE; and (2) iron oxides and Fe(III)-Cr(III) complexes might be formed after reaction. FTIR result showed that some functional groups were involved in the removal process. Moreover, the presence of iron oxides were confirmed by FTIR. Both SEM and XPS results verified that encapsulation could describe such immobilization of Fe NPs using agarose. Finally, the kinetics study supported the removal mechanism. Such encapsulation of Fe NPs via a green strategy is simple, quick, and cost-effective, making in situ remediation of mixed contaminants more favorable.
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2016 |
Bello O, Naidu R, Rahman MM, Liu Y, Dong Z, 'Lead concentration in the blood of the general population living near a lead-zinc mine site, Nigeria: Exposure pathways', Science of the Total Environment, 542 908-914 (2016) [C1]
Lead (Pb) poisoning in children is a major public health catastrophe worldwide. This report summarises both exposure pathways and blood Pb levels in children below 7. years of age... [more]
Lead (Pb) poisoning in children is a major public health catastrophe worldwide. This report summarises both exposure pathways and blood Pb levels in children below 7. years of age and adults (above 18. years) from the Adudu community living near a lead-zinc mine in Nasawara, Nigeria. The average and median blood Pb levels in children and adults were 2.1 and 1.3 µg/dL, 3.1 and 1.8 µg/dL, respectively. However, Pb in 14% of adults' blood exceeded 5. µg/dL, which is the recommended threshold blood Pb concentration in adults as established by the Centers for Disease Control and Prevention (CDC). Furthermore 68% of adults' blood exceeded blood Pb action level of 2 µg/dL. For children, 11.4% and 31% of the blood samples exceeded 5 µg/dL and 2 µg/dL, respectively, while no safe blood Pb level in children has been recommended. In Nasawara, a significant difference (p< 0.05) was observed between the various age groups in children with 2-4 years old having the highest levels and 6. year old children having the lowest Pb levels. Although this study did not detect elevated levels of Pb in children's blood in regions such as Zamfara, Nigeria and Kabwe, Zambia, a high percentage of samples exceeded 2 µg/dL. Soils, floor dusts, water and crops also reveal that Pb contamination in the study area could potentially be the major cause of blood Pb in the community exposed to mining. This study also observed a significant correlation between water Pb levels of adults and blood Pb levels, suggesting that water is the major exposure pathway. This analysis highlights the need to properly manage mining activities so that the health of communities living in the vicinity of a Pb-Zn mine is not compromised.
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2016 |
Venkateswarlu K, Nirola R, Kuppusamy S, Thavamani P, Naidu R, Megharaj M, 'Abandoned metalliferous mines: ecological impacts and potential approaches for reclamation', Reviews in Environmental Science and Biotechnology, 15 327-354 (2016) [C1]
The lack of awareness for timely management of the environment surrounding a metal mine site results in several adverse consequences such as rampant business losses, abandoning th... [more]
The lack of awareness for timely management of the environment surrounding a metal mine site results in several adverse consequences such as rampant business losses, abandoning the bread-earning mining industry, domestic instability and rise in ghost towns, increased environmental pollution, and indirect long-term impacts on the ecosystem. Although several abandoned mine lands (AMLs) exist globally, information on these derelict mines has not been consolidated in the literature. We present here the state-of-the-art on AMLs in major mining countries with emphasis on their impact towards soil health and biodiversity, remediation methods, and laws governing management of mined sites. While reclamation of metalliferous mines by phytoremediation is still a suitable option, there exist several limitations for its implementation. However, many issues of phytoremediation at the derelict mines can be resolved following phytostabilization, a technology that is effective also at the modern operational mine sites. The use of transgenic plant species in phytoremediation of metals in contaminated sites is also gaining momentum. In any case, monitoring and efficacy testing for bioremediation of mined sites is essential. The approaches for reclamation of metalliferous mines such as environmental awareness, effective planning and assessment of pre- and post-mining activities, implementation of regulations, and a safe and good use of phytostabilizers among the native plants for revegetation and ecological restoration are discussed in detail in the present review. We also suggest the use of microbially-enhanced phytoremediation and nanotechnology for efficient reclamation of AMLs, and identify future work warranted in this area of research. Further, we believe that the integration of science of remediation with mining policies and regulations is a reliable option which when executed can virtually balance economic development and environmental destruction for safer future.
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Nova |
2016 |
Bahar MM, Megharaj M, Naidu R, 'Oxidation of arsenite to arsenate in growth medium and groundwater using a novel arsenite-oxidizing diazotrophic bacterium isolated from soil', International Biodeterioration and Biodegradation, 106 178-182 (2016) [C1]
An arsenic hyper-tolerant diazotrophic bacterium was isolated from a heavy metal contaminated soil. The pure isolate MM-17 was identified as Azospirillum sp. based on phylogenetic... [more]
An arsenic hyper-tolerant diazotrophic bacterium was isolated from a heavy metal contaminated soil. The pure isolate MM-17 was identified as Azospirillum sp. based on phylogenetic analysis of 16S rRNA. The strain oxidized 100 µM As(III) to As(V) in both culture media (minimal salts) and real groundwater within 8 and 10 h, respectively. The oxidation of As(III) by this strain was observed within the pH range 5-10 with the best performance at pH 7-8. As(III) oxidation was found to be independent of cell growth which implies the oxidation enzymes are constitutively expressed. The whole cell kinetic study highlighted a lower value of kinetic constant, Ks as 32.9 µM As(III), which indicates that the strain MM-17 has greater affinity for As(III). The gene sequence of the large subunit of arsenite oxidase of MM-17 showed 99 and 72% similarity to the large subunit of arsenite oxidase of Stenotrophomonas sp. MM-7 and Sinorhizobium sp. M14, respectively. Sphaeroplasts experiments suggest that arsenite oxidase is a membrane associated protein in MM-17.
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Nova |
2016 |
Rusmin R, Sarkar B, Biswas B, Churchman J, Liu Y, Naidu R, 'Structural, electrokinetic and surface properties of activated palygorskite for environmental application', Applied Clay Science, 134 95-102 (2016) [C1]
Unlike smectite, the surface characteristics of palygorskite remain underexplored for its potential application in environmental remediation. In this study, palygorskite from West... [more]
Unlike smectite, the surface characteristics of palygorskite remain underexplored for its potential application in environmental remediation. In this study, palygorskite from Western Australia was activated through thermal (300 °C for 4 h), acid (4 M HCl for 2 h at 70 °C) and acid-thermal (acid treatment followed by heating at 300 °C for 4 h) treatments, and the structural and physico-chemical characteristics were examined against the raw clay mineral. The influence of activation was systematically investigated using X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR) spectroscopy, N2 adsorption-desorption measurements and solid state 27Al Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) spectroscopy. The XRD patterns indicated preservation of the crystalline structure of palygorskite following all the treatments. These findings were supported by the Al (IV) and Al (VI) coordination peaks (chemical shift ~ 55 and 2.9 ppm, respectively) which were unaltered in the 27Al MAS NMR spectra of the samples. The acid-thermal activated palygorskite exhibited the highest specific surface area (152.7 m2 g- 1) and pore volume (0.2137 cm3 g- 1) which respectively were 3-fold and 69% greater than the raw palygorskite. The potentiometric titration analyses highlighted the possible role of Al derivatives towards development of the surface charge of the activated palygorskites. Electrokinetic studies described the stability of the activated products (zeta potential values ranging from - 5 mV to - 32 mV) at different electrolyte (NaNO3) concentrations. Combined acid-thermal activated palygorskite displayed a stronger specific adsorption of multivalent cations, and held a direct relevance to environmental remediation. Findings of this study will assist in the development of palygorskite-based adsorbents for heavy metal contaminants remediation.
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Nova |
2016 |
Lamb DT, Kader M, Wang L, Choppala G, Rahman MM, Megharaj M, Naidu R, 'Pore-Water Carbonate and Phosphate As Predictors of Arsenate Toxicity in Soil', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 50 13062-13069 (2016) [C1]
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Nova |
2016 |
Perelomov L, Sarkar B, Rahman MM, Goryacheva A, Naidu R, 'Uptake of lead by Na-exchanged and Al-pillared bentonite in the presence of organic acids with different functional groups', Applied Clay Science, 119 417-423 (2016) [C1]
This study investigated the uptake of lead (Pb) ions by Na-rich bentonite (Na-bentonite) and Al-pillared bentonite (Al-bentonite) in the presence or absence of organic acids conta... [more]
This study investigated the uptake of lead (Pb) ions by Na-rich bentonite (Na-bentonite) and Al-pillared bentonite (Al-bentonite) in the presence or absence of organic acids containing different functional groups. Na-bentonite was an effective adsorbent for Pb2+ ions. The element was taken up by the mineral through ion exchange mechanism; and the formation of a lead carbonate hydroxide (hydrocerussite) also occurred. Al-bentonite adsorbed a smaller amount of Pb than Na-bentonite. XRD data indicated that the totality of clay interlayers was occupied by the pillaring agent that led to decrease in Pb uptake. The amount of Pb taken up by Na-bentonite decreased with increasing concentration of citric acid both when Pb and organic acid were added together as a mixture, and when citric acid was added 2 h before the metal ions. Possible reasons for this were the formation of Pb-citrate complexes which had less affinity to Na-bentonite, and also hydrocerussite dissolution at acidic pH. Citric acid, however, did not change Pb uptake by Al-bentonite. Addition of lysine together with Pb did not have any effect on Pb uptake by Na-bentonite and Al-bentonite, which indicated occupation of different adsorption sites by Pb and lysine compared to citrate. However, lysine addition at 1:1 ratio 2 h before Pb decreased the metal uptake, which again may be explained by the effect of lysine in hydrocerussite dissolution. Uptake of Pb in the presence of lysine was also higher when using Na-bentonite compared to Al-bentonite.
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Nova |
2016 |
Bekele DN, Naidu R, Chadalavada S, 'Influence of soil properties on vapor-phase sorption of trichloroethylene', Journal of Hazardous Materials, 306 34-40 (2016) [C1]
Current practices in health risk assessment from vapor intrusion (VI) using mathematical models are based on assumptions that the subsurface sorption equilibrium is attained. The ... [more]
Current practices in health risk assessment from vapor intrusion (VI) using mathematical models are based on assumptions that the subsurface sorption equilibrium is attained. The time required for sorption to reach near-steady-state conditions at sites may take months or years to achieve. This study investigated the vapor phase attenuation of trichloroethylene (TCE) in five soils varying widely in clay and organic matter content using repacked columns. The primary indicators of TCE sorption were vapor retardation rate (Rt), the time required for the TCE vapor to pass through the soil column, and specific volume of retention (VR), and total volume of TCE retained in soil. Results show TCE vapor retardation is mainly due to the rapid partitioning of the compound to SOM. However, the specific volume of retention of clayey soils with secondary mineral particles was higher. Linear regression analyses of the SOM and clay fraction with VR show that a unit increase in clay fraction results in higher sorption of TCE (VR) than the SOM. However, partitioning of TCE vapor was not consistent with the samples' surface areas but was mainly a function of the type of secondary minerals present in soils.
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Nova |
2016 |
Weng X, Jin X, Lin J, Naidu R, Chen Z, 'Removal of mixed contaminants Cr(VI) and Cu(II) by green synthesized iron based nanoparticles', Ecological Engineering, 97 32-39 (2016) [C1]
In this study, iron based nanoparticles (Fe NPs) synthesized by eucalyptus leaf extracts was used to remove mixed Cr(VI) and Cu(II), where the efficiency was 58.9% and 33.0%, resp... [more]
In this study, iron based nanoparticles (Fe NPs) synthesized by eucalyptus leaf extracts was used to remove mixed Cr(VI) and Cu(II), where the efficiency was 58.9% and 33.0%, respectively. In contrast, only 20.2% of Cr(VI) and 11.8% of Cu(II) were removed by adsorption using eucalyptus leaf extracts. In addition, the removal mechanism for mixed Cr(VI) and Cu(II) based on both adsorption and reduction by Fe NPs was confirmed by various characterization techniques, including the formations of Fe NPs, iron oxides and capping layer. Furthermore, the kinetics suggested that firstly, their sorption followed the pseudo second-order model well; and secondly, reduction of Cr(VI) and Cu(II) followed the pseudo-first-order model well. Finally, Fe NPs not only removed Cr(VI) and Cu(II), but also Pb(II) and Zn(II) in electroplating wastewater. This provides a new insights into the removal of metal ions using green Fe NPs with a low cost and environmentally friendly remediation strategy.
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Nova |
2016 |
Nuruzzaman M, Rahman MM, Liu Y, Naidu R, 'Nanoencapsulation, Nano-guard for Pesticides: A New Window for Safe Application', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 64 1447-1483 (2016) [C1]
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Nova |
2016 |
Kuppusamy S, Thavamani P, Megharaj M, Naidu R, 'Bioaugmentation with Novel Microbial Formula vs. Natural Attenuation of a Long-Term Mixed Contaminated Soil - Treatability Studies in Solid- and Slurry-Phase Microcosms', Water, Air, and Soil Pollution, 227 (2016) [C1]
Treatability studies in real contaminated soils are essential to predict the feasibility of microbial consortium augmentation for field-scale bioremediation of contaminated sites.... [more]
Treatability studies in real contaminated soils are essential to predict the feasibility of microbial consortium augmentation for field-scale bioremediation of contaminated sites. In this study, the biodegradation of a mixture of seven PAHs in a manufactured gas plant (MGP) soil contaminated with 3967 mg kg-1 of total PAHs using novel acid-, metal-tolerant, N-fixing, P-solubilizing, and biosurfactant-producing LMW and HMW PAH-degrading bacterial combinations as inoculums was compared in slurry- and solid-phase microcosms over natural attenuation. Bioaugmentation of 5 % of bacterial consortia A and N in slurry- and solid-phase systems enhanced 4.6-5.7 and 9.3-10.7 % of total PAH degradation, respectively, over natural attenuation. Occurrence of 62.7-88 % of PAH biodegradation during natural attenuation in soil and slurry illustrated the accelerated rate of intrinsic metabolic activity of the autochthonous microbial community in the selected MGP soil. Monitoring of the total microbial activity and population of PAH degraders revealed that the observed biodegradation trend in MGP soil resulted from microbial mineralization. In the slurry, higher biodegradation rate constant (k) and lower half-life values (t 1/2) was observed during bioaugmentation with consortium N, highlighting the use of bioaugmentation in bioslurries/bioreactor to achieve rapid and efficient bioremediation compared to that of a static solid system. In general, natural attenuation was on par with bioaugmentation. Hence, depending on the type of soil, natural attenuation might outweigh bioaugmentation and a careful investigation using laboratory treatability studies are highly recommended before the upscale of a developed bioremediation strategy to field level.
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Nova |
2016 |
Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'One-step green synthesis of bimetallic Fe/Pd nanoparticles used to degrade Orange II', Journal of Hazardous Materials, 303 145-153 (2016) [C1]
To reduce cost and enhance reactivity, bimetallic Fe/Pd nanoparticles (NPs) were firstly synthesized using grape leaf aqueous extract to remove Orange II. Green synthesized bimeta... [more]
To reduce cost and enhance reactivity, bimetallic Fe/Pd nanoparticles (NPs) were firstly synthesized using grape leaf aqueous extract to remove Orange II. Green synthesized bimetallic Fe/Pd NPs (98.0%) demonstrated a far higher ability to remove Orange II in 12h compared to Fe NPs (16.0%). Meanwhile, all precursors, e.g., grape leaf extract, Fe2+ and Pd2+, had no obvious effect on removing Orange II since less than 2.0% was removed. Kinetics study revealed that the removal rate fitted well to the pseudo-first-order reduction and pseudo-second-order adsorption model, meaning that removing Orange II via Fe/Pd NPs involved both adsorption and catalytic reduction. The remarkable stability of Fe/Pd NPs showed the potential application for removing azo dyes. Furthermore, Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) confirmed the changes in Fe/Pd NPs before and after reaction with Orange II. High Performance Liquid Chromatography-Mass Spectrum (HPLC-MS) identified the degraded products in the removal of Orange II, and finally a removal mechanism was proposed. This one-step strategy using grape leaf aqueous extract to synthesize Fe/Pd NPs is simple, cost-effective and environmentally benign, making possible the large-scale production of Fe/Pd NPs for field remediation.
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Nova |
2016 |
Abbasian F, Lockington R, Megharaj M, Naidu R, 'A Review on the Genetics of Aliphatic and Aromatic Hydrocarbon Degradation', APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY, 178 224-250 (2016) [C1]
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Nova |
2016 |
Kuppusamy S, Thavamani P, Megharaj M, Nirola R, Lee YB, Naidu R, 'Assessment of antioxidant activity, minerals, phenols and flavonoid contents of common plant/tree waste extracts', INDUSTRIAL CROPS AND PRODUCTS, 83 630-634 (2016) [C1]
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Nova |
2016 |
Wong M-H, Ok Y-S, Naidu R, 'Biological-waste as resource, with a focus on food waste PREFACE', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 23 7071-7073 (2016)
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2016 |
Gao Y, Wang F, Wu Y, Naidu R, Chen Z, 'Comparison of degradation mechanisms of microcystin-LR using nanoscale zero-valent iron (nZVI) and bimetallic Fe/Ni and Fe/Pd nanoparticles', Chemical Engineering Journal, 285 459-466 (2016) [C1]
Microcystin-LR (MC-LR) as a drinking water contaminant was degraded using iron-based nanoparticles such as nZVI, Fe/Ni and Fe/Pd. Batch experiments showed that 28.0% of MC-LR with... [more]
Microcystin-LR (MC-LR) as a drinking water contaminant was degraded using iron-based nanoparticles such as nZVI, Fe/Ni and Fe/Pd. Batch experiments showed that 28.0% of MC-LR with the initial concentration of 5mgL-1 was removed using nZVI, while more than 90% of MC-LR was removed using either bimetallic Fe/Ni or Fe/Pd after degrading for 120min. In addition, the results indicated that Fe0 was oxided to iron oxide or hydroxide after reacting with MC-LR, while Ni or Pd acted as the catalysis to prevent Fe0 corrosion and generating hydrogen via water reduction. Degradation of MC-LR by iron-based nanoparticles fitted well to the pseudo-first order kinetic model and the degradation was a diffusion-controlled reaction with low activation energies (8-21kJmol-1). Finally, the degradation mechanisms of MC-LR using iron-based nanoparticles were proposed according to the LC-MS analysis. In nZVI case, when the MC-LR was quickly adsorbed on nanoparticles, electron transfer and H2 generated from iron corrosion were generated and broke down the Adda composition of MC-LR. Based on corrosion in the Fe0-H2O system, bimetallic Fe/Ni and Fe/Pd further utilized the abundant hydrogen radical decomposed from H2 under the catalysis of Ni or Pd, and destroyed the Adda to form small molecules.
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Nova |
2016 |
Fang C, Megharaj M, Naidu R, 'Surface-enhanced Raman scattering (SERS) detection of fluorosurfactants in firefighting foams', RSC Advances, 6 11140-11145 (2016) [C1]
We demonstrated SERS (surface-enhanced Raman scattering) detection of fluorosurfactants (FSs), which are commonly formulated in aqueous firefighting foams (AFFFs), by increasing t... [more]
We demonstrated SERS (surface-enhanced Raman scattering) detection of fluorosurfactants (FSs), which are commonly formulated in aqueous firefighting foams (AFFFs), by increasing their loading affinity and boosting their Raman activity. In order to increase FS's loading affinity, we introduced a cationic dye (ethyl violet or methyl blue) into the aqueous incubation solution to co-precipitate the FS onto the SERS substrate surface by forming an immiscible ion-pair (dye-FS). In the meantime, the Raman signal intensity was boosted due to the much higher Raman activity of the dye than that of FS. We compared two kinds of SERS substrate, patterned silver (Ag) surface and graphene oxide (GO) membrane, and noted the former (dye-FS-Ag) enhanced the Raman signal whilst the latter (dye-FS-GO) increased the loading affinity of the ion-pair due to the hydrophobic surface. We thus introduced silver nanoparticles (AgNPs) into the incubation solution (as well as dye) to co-precipitate FS onto the GO surface via an assembly of dye-FS-AgNP-GO. Using this assembly, we successfully detected FSs including pentadecafluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), and 1H,1H,2H,2H-perfluorooctanesulfonic acid (6:2FTS), with a limit-of-detection (LOD) of ~50 ppb (~120 nM) for PFOA.
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Nova |
2016 |
Ramadass K, Palanisami T, Smith E, Mayilswami S, Megharaj M, Naidu R, 'Earthworm Comet Assay for Assessing the Risk of Weathered Petroleum Hydrocarbon Contaminated Soils: Need to Look Further than Target Contaminants', Archives of Environmental Contamination and Toxicology, 71 561-571 (2016) [C1]
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Nova |
2016 |
Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Sensitivity and Antioxidant Response of Chlorella sp. MM3 to Used Engine Oil and Its Water Accommodated Fraction', Bulletin of Environmental Contamination and Toxicology, 97 71-77 (2016) [C1]
We exposed the microalgal strain, Chlorella sp. MM3, to unused or used engine oil, or their water accommodated fractions (WAFs) to determine growth inhibition and response of anti... [more]
We exposed the microalgal strain, Chlorella sp. MM3, to unused or used engine oil, or their water accommodated fractions (WAFs) to determine growth inhibition and response of antioxidant enzymes. Oil type and oil concentration greatly affected the microalgal growth. Used oil at 0.04¿% (0.4¿g L-1) resulted in 50¿% inhibition in algal growth, measured in terms of chlorophyll-a, while the corresponding concentration of unused oil was nontoxic. Similarly, used oil WAF showed significant toxicity to the algal growth at 10¿% level, whereas WAF from unused oil was nontoxic even at 100¿% concentration. Peroxidase enzyme in the microalga significantly increased with used oil at concentrations above 0.04¿g L-1 whereas the induction of superoxide dismutase and catalase was apparent only at 0.06¿g L-1. Activities of the antioxidant enzymes increased significantly when the microalga was exposed to 75 and 100¿% WAF obtained from used oil. The used oil toxicity on microalga could be due to the presence of toxic soluble mono- and polyaromatic compounds, heavy metals, and other compounds attained by the oil during its use in the motor engines.
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Nova |
2016 |
Ma C, Ming H, Lin C, Naidu R, Bolan N, 'Phytoextraction of heavy metal from tailing waste using Napier grass', CATENA, 136 74-83 (2016) [C1]
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2016 |
Subramaniyam V, Subashchandrabose SR, Ganeshkumar V, Thavamani P, Chen Z, Naidu R, Megharaj M, 'Cultivation of Chlorella on brewery wastewater and nano-particle biosynthesis by its biomass', BIORESOURCE TECHNOLOGY, 211 698-703 (2016) [C1]
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Nova |
2016 |
Liu Y, Naidu R, Ming H, Dharmarajan R, Du J, 'Effects of thermal treatments on the characterisation and utilisation of red mud with sawdust additive', Waste Management and Research, 34 518-526 (2016) [C1]
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Nova |
2016 |
Zhu C, Dong X, Chen Z, Naidu R, 'Adsorption of aqueous Pb(II), Cu(II), Zn(II) ions by amorphous tin(VI) hydrogen phosphate: an excellent inorganic adsorbent', International Journal of Environmental Science and Technology, 13 1257-1268 (2016) [C1]
Amorphous tin(VI) hydrogen phosphate (ATHP) was synthesized using the liquid phase precipitation method and served as an adsorbent to remove Pb(II), Cu(II), and Zn(II) from aqueou... [more]
Amorphous tin(VI) hydrogen phosphate (ATHP) was synthesized using the liquid phase precipitation method and served as an adsorbent to remove Pb(II), Cu(II), and Zn(II) from aqueous solutions. The ATHP was characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption¿desorption techniques. Adsorption properties were evaluated as a function of pH, reaction time, concentration of reactants, and salinity. Their equilibrium adsorption data were modeled using Freundlich, Langmuir, and Dubinin¿Kaganer¿Radushkevich isotherms, respectively. The results revealed that adsorption equilibrium reached within 180¿min. ATHP indicated good adsorption even below the pHZPC, and best adsorption at pH 5 for Pb(II) and Cu(II) and at pH 5.5 for Zn(II) was observed. Equilibrium data fitted better to the Langmuir model for Pb(II) and Cu(II) and fitted better to the Freundlich model for Zn(II). The saturated adsorption capacities deduced from the Langmuir model were 2.425, 1.801, and 0.600¿mmol/g for Cu(II), Pb(II), and Zn(II), respectively, indicating an adsorption affinity order of Cu¿>¿Pb¿>¿Zn. There is a negative correlation between the concentration of NaCl and adsorption capacity of ATHP, yet ATHP still exhibited excellent adsorption having an adsorption capacity of 19.35, 15.16, 6.425¿mg/g when the concentration of NaCl was 0.6¿mol/L. The free energy (E) was 12.33, 10.70, and 14.74¿kJ/mol for Pb(II), Cu(II), and Zn(II), respectively. An adsorption mechanism based on ion exchange between heavy metal ions and H+ in the ATHP is proposed. Furthermore, the used ATHP was regenerated by HCl solution and the adsorbent was used repeatedly.
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2016 |
Panneerselvan L, Sivaram AK, Mallavarapu M, Naidu R, 'Evaluation of cyto- and genotoxic effects of Class B firefighting foam products: Tridol-S 3% AFFF and Tridol-S 6% AFFF to Allium cepa', Environmental Technology and Innovation, 6 185-194 (2016) [C1]
Worldwide a multitude of firefighting compounds are currently used for the mitigation and protection of man-made structures and forests alike from fire damages. Among the class of... [more]
Worldwide a multitude of firefighting compounds are currently used for the mitigation and protection of man-made structures and forests alike from fire damages. Among the class of firefighting agents, Class B firefighting foams are generally used to control fires generated from hydrocarbon liquids. In the present study, we assessed the cyto- and genotoxicity of two widely used class B firefighting foam concentrates, Tridol-S 3% and Tridol-S 6% to Alliumcepa through chromosomal aberration and comet assay using root meristem cells. A. cepa root tips were exposed to Tridol-S 3% and Tridol-S 6% with six different concentrations (0%, 0.005%, 0.01%, 0.02%, 0.03%, 0.04% and 0.05%) for 24 h. Cytogenetic effect endpoints such as mitotic index, and chromosomal aberrations were observed. Chromosomal aberrations in the control (untreated onion root tips) was negligible with the mitotic index (MI) value of 79.6%, while the MI significantly decreased in all the test concentrations of firefighting compounds. Genotoxicity assessment through comet assay also revealed that both the products were genotoxic with a significant increase in per cent tail DNA and olive tail moment. Among the test compounds, Tridol-S 3% was more toxic than Tridol-S 6%. To our knowledge, this is the first study on the cyto- and genotoxic effects of class B firefighting foams to A. cepa root meristem cells. This study also suggests that the toxicological studies using A. cepa root meristem cells can be employed for evaluating the toxicological impacts of firefighting foams in the environment.
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Faustorilla MV, Chen Z, Dharmarajan R, Naidu R, 'Solid phase extraction and fractionation of total petroleum hydrocarbons in contaminated soil by GC-MSD/FID techniques', Journal of Chromatography and Separation Techniques, 7 87-87 (2016)
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2016 |
Mahbub KR, Krishnan K, Naidu R, Megharaj M, 'Mercury resistance and volatilization by Pseudoxanthomonas sp. SE1 isolated from soil', Environmental Technology and Innovation, 6 94-104 (2016) [C1]
A mercury resistant bacterial strain SE1 isolated from contaminated soil was identified as Pseudoxanthomonas based on 16s rRNA sequencing. The Hg resistance was examined in both n... [more]
A mercury resistant bacterial strain SE1 isolated from contaminated soil was identified as Pseudoxanthomonas based on 16s rRNA sequencing. The Hg resistance was examined in both nutrient-rich media as well as low nutrient media and expressed as EC50 and MIC values. Estimated EC50 and MIC values in nutrient-rich media and low nutrient media had the following respective recordings ¿ 22.6 mg L-1; 23.1 mg L-1 and 1.4 mg L-1 and 1.7 mg L-1. The isolate was able to volatilize inorganic mercury demonstrated by a modified photographic film experiment and subsequently revealed its ability to remove mercury from the solution. The ICP-QQQ-MS analysis of SE1 inoculated solution showed almost 60% of 1.5 mg L-1 mercury was volatilized in 6 h and almost 40% were accumulated in cell pellets. The mercuric reductase gene merA was identified in the genome of isolate SE1 and sequenced. The deduced amino acid sequence of merA gene indicated a sequence homology with different organisms from the alpha proteobacteria group and eukaryotic fungi. merA encoded enzyme mercuric reductase activity was evident in the crude protein of the isolate. The isolate's ability to resist Hg, it's Hg volatilization potential and the presence of merA gene and mercuric reductase enzyme demonstrates the potential application of this strain in mercury bioremediation.
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Nova |
2016 |
Kuppusamy S, Thavamani P, Megharaj M, Lee YB, Naidu R, 'Isolation and characterization of polycyclic aromatic hydrocarbons (PAHs) degrading, pH tolerant, N-fixing and P-solubilizing novel bacteria from manufactured gas plant (MGP) site soils', Environmental Technology and Innovation, 6 204-219 (2016) [C1]
Dearth of high molecular weight contaminant degradation, pH tolerance and growth limiting nutrient assimilation potentials of the selected microorganisms are some of the prime fac... [more]
Dearth of high molecular weight contaminant degradation, pH tolerance and growth limiting nutrient assimilation potentials of the selected microorganisms are some of the prime factors reasonable for the failures in field-scale bioremediation of PAHs contaminated soils. Hence an effort was made in this study for the first time to identify HMW PAHs degrading, N-fixing and P-solubilizing bacteria with pH tolerance from long-term manufactured gas plant site soils. Four distinct strains that could degrade both LMW and HMW PAHs were identified. Among the isolates, Stenotrophomonas (MTS-2) followed by Citrobacter (MTS-3) and Pseudomonas (MTS-1) were furthermost effective in the degradation of HMW PAHs either as individual or in the presence of co-substrate (LMW PAHs). MTS-1, 2 and 3 (co)degraded model LMW PAHs, Phe (100% of 150 mg L-1) and HMW PAHs Pyr (100% of 150 mg L-1) or BaP (90¿100% of 50 mg L-1) in 3, 12¿15 and 30 days, respectively and recorded the least half-life time (t1/2) and highest biodegradation rate constants (k). One of the significant findings is the diazotrophic P-solubilization ability, acid and alkali tolerance (optimum pH=5.0¿8.0) of the HMW PAHs degrading Pseudomonas strain MTS-1. Stenotrophomonas (MTS-2) was also found to be superior as it could solubilize P and tolerate acidic condition (optimum pH=5.0¿7.5) during HMW PAHs degradation. Further, our study is the first evidence of diazotrophic P solubilization potential of Agrobacterium (MTS-4) and P-solubilizing capacity of Citrobacter (MTS-3) during bioremediation. Thus, the results of this study demonstrate the promising use of the newly identified PAH degraders, notably MTS-1, 2 and 3 either as individuals or as consortia as an excellent candidate in the bioremediation or phytoremediation of PAHs contaminated soils.
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2016 |
Yan K, Dong Z, Liu Y, Naidu R, 'Quantifying statistical relationships between commonly used in vitro models for estimating lead bioaccessibility', Environmental Science and Pollution Research, 23 6873-6882 (2016) [C1]
Bioaccessibility to assess potential risks resulting from exposure to Pb-contaminated soils is commonly estimated using various in vitro methods. However, existing in vitro method... [more]
Bioaccessibility to assess potential risks resulting from exposure to Pb-contaminated soils is commonly estimated using various in vitro methods. However, existing in vitro methods yield different results depending on the composition of the extractant as well as the contaminated soils. For this reason, the relationships between the five commonly used in vitro methods, the Relative Bioavailability Leaching Procedure (RBALP), the unified BioAccessibility Research Group Europe (BARGE) method (UBM), the Solubility Bioaccessibility Research Consortium assay (SBRC), a Physiologically Based Extraction Test (PBET), and the in vitro Digestion Model (RIVM) were quantified statistically using 10 soils from long-term Pb-contaminated mining and smelter sites located in Western Australia and South Australia. For all 10 soils, the measured Pb bioaccessibility regarding all in vitro methods varied from 1.9 to 106¿% for gastric phase, which is higher than that for intestinal phase: 0.2 ~ 78.6¿%. The variations in Pb bioaccessibility depend on the in vitro models being used, suggesting that the method chosen for bioaccessibility assessment must be validated against in vivo studies prior to use for predicting risk. Regression studies between RBALP and SRBC, RBALP and RIVM (0.06) (0.06¿g of soil in each tube, S:L ratios for gastric phase and intestinal phase are 1:375 and 1:958, respectively) showed that Pb bioaccessibility based on the three methods were comparable. Meanwhile, the slopes between RBALP and UBM, RBALP and RIVM (0.6) (0.6¿g soil in each tube, S:L ratios for gastric phase and intestinal phase are 1:37.5 and 1:96, respectively) were 1.21 and 1.02, respectively. The findings presented in this study could help standardize in vitro bioaccessibility measurements and provide a scientific basis for further relating Pb bioavailability and soil properties.
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Seshadri B, Bolan NS, Wijesekara H, Kunhikrishnan A, Thangarajan R, Qi F, et al., 'Phosphorus-cadmium interactions in paddy soils', Geoderma, 270 43-59 (2016) [C1]
Regular application of phosphate (P) fertilisers has been identified as the main source of heavy metal(loid) contamination including cadmium (Cd) in agricultural soils. Some of th... [more]
Regular application of phosphate (P) fertilisers has been identified as the main source of heavy metal(loid) contamination including cadmium (Cd) in agricultural soils. Some of these P fertilisers that act as a source of Cd contamination of soils have also been found to act as a sink for the immobilisation of this metal(loid). In paddy soils, redox reactions play an important role in the (im)mobilisation of nutrients and heavy metal(loid)s, as a result of flooding of the rice plains. Although a number of studies have examined the potential value of P compounds in the immobilisation of metals in contaminated soils, there has been no comprehensive review on the mechanisms involved in the P-induced (im)mobilisation of Cd in paddy soils. There are a number of factors that influences P induced Cd (im)mobilisation in paddy soils that include pH, redox reactions, liming effect, rhizosphere acidification and root iron plaques. Following a brief overview of the reactions of Cd and common P compounds that are used as fertiliser in soils, the review focuses on the above mentioned mechanisms for the (im)mobilisation of Cd by P compounds in paddy soils. The role of iron plaques on Cd status in soil and rice plants is also discussed followed by a summary and future research needs.
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Cheng Q, Hu Z, Naidu R, Xiao B, 'The performance and validation of an underground river reactor using compost energy as heat source', Ecological Engineering, 87 98-101 (2016)
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Liu C, Subashchandrabose S, Ming H, Xiao B, Naidu R, Megharaj M, 'Phycoremediation of dairy and winery wastewater using Diplosphaera sp. MM1', Journal of Applied Phycology, 28 3331-3341 (2016) [C1]
A new green microalgal species was isolated, identified and investigated for its biomass production and nutrient removal efficiency in dairy and winery wastewater in this study. T... [more]
A new green microalgal species was isolated, identified and investigated for its biomass production and nutrient removal efficiency in dairy and winery wastewater in this study. The 18S rRNA-based phylogenetic analysis revealed that this new strain is a Diplosphaera sp. and was designated strain MM1. The growth of this strain was evaluated in different diluted dairy and winery wastewaters. The highest algal biomass production (up to 2.3¿g¿L-1) was obtained in dairy wastewater (D3; dairy wastewater 1:2 deionised water) after 14¿days of culture. However, for winery wastewater, the highest algal biomass production (up to 1.46¿g¿L-1) was obtained in wastewater combination W2 (winery wastewater 1:1 deionised water) after 14¿days of culture. Turbid dairy wastewater with high concentration of nitrogen and phosphorous slowed down the initial growth of the alga. However, at the end of day 14, biomass production was nearly twofold higher than that of winery wastewater. The findings from both types of wastewater suggest that Diplosphaera sp. MM1 has potential for its application in generating biomass with simultaneous remediation of nutrient-rich wastewater.
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Sanderson P, Naidu R, Bolan N, 'The effect of environmental conditions and soil physicochemistry on phosphate stabilisation of Pb in shooting range soils', Journal of Environmental Management, 170 123-130 (2016) [C1]
The stabilisation of Pb in the soil by phosphate is influenced by environmental conditions and physicochemical properties of the soils to which it is applied. Stabilisation of Pb ... [more]
The stabilisation of Pb in the soil by phosphate is influenced by environmental conditions and physicochemical properties of the soils to which it is applied. Stabilisation of Pb by phosphate was examined in four soils under different environmental conditions.The effect of soil moisture and temperature on stabilisation of Pb by phosphate was examined by measurement of water extractable and bioaccessible Pb, sequential fractionation and X-ray absorption spectroscopy. The addition of humic acid, ammonium nitrate and chloride was also examined for inhibition or improvement of Pb stability with phosphate treatment.The effect of moisture level varied between soils. In soil MB and DA a soil moisture level of 50% water holding capacity was sufficient to maximise stabilisation of Pb, but in soil TV and PE reduction in bioaccessible Pb was inhibited at this moisture level. Providing moisture at twice the soil water holding capacity did not enhance the effect of phosphate on Pb stabilisation. The difference of Pb stability as a result of incubating phosphate treated soils at 18 °C and 37 °C was relatively small. However wet-dry cycles decreased the effectiveness of phosphate treatment. The reduction in bioaccessible Pb obtained was between 20 and 40% with the most optimal treatment conditions. The reduction in water extractable Pb by phosphate was substantial regardless of incubation conditions and the effect of different temperature and soil moisture regimes was not significant.Selective sequential extraction showed phosphate treatment converted Pb in fraction 1 (exchangeable, acid and water soluble) to fraction 2 (reducible). There were small difference in fraction 4 (residual) Pb and fraction 1 as a result of treatment conditions. X-ray absorption spectroscopy of stabilised PE soil revealed small differences in Pb speciation under varying soil moisture and temperature treatments. The addition of humic acid and chloride produced the greatest effect on Pb speciation in phosphate treated soils.
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Abbasian F, Lockington R, Megharaj M, Naidu R, 'Identification of a new operon involved in desulfurization of dibenzothiophenes using a metagenomic study and cloning and functional analysis of the genes', Enzyme and Microbial Technology, 87-88 24-28 (2016) [C1]
The presence of sulphur-substituted hydrocarbons in fossil fuels are one of main reasons for the release of sulfur oxides into the environment. Dibenzothiophenes (DBT) are organic... [more]
The presence of sulphur-substituted hydrocarbons in fossil fuels are one of main reasons for the release of sulfur oxides into the environment. Dibenzothiophenes (DBT) are organic sulfur-containing molecules in crude oil, which have the potential for biological oxidation, with the sulphur being removed through an enzymatic cleavage of the C. S bonds. Therefore, finding new strains that can desulfurize this compound has recently become a point of interest. In this study, three new genes involved in the bacterial desulfurization of Dibenzothiophene, which were sequenced in the course of a metagenomic study, were isolated by PCR amplification in the laboratory. The activities of these genes were then analysed following insertion into an expression vector and cloning in Escherichia coli DH5a cells. Based on the results, all three genes were actively expressed and their products could act on their corresponding substrates.
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Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Lee YB, Naidu R, 'Potential of Melaleuca diosmifolia leaf as a low-cost adsorbent for hexavalent chromium removal from contaminated water bodies', Process Safety and Environmental Protection, 100 173-182 (2016) [C1]
The present study describes for the first time the utilization of dried twigs of Melaleuca diosmifolia, fallen off from the plant, to detoxify and remove hexavalent chromium or Cr... [more]
The present study describes for the first time the utilization of dried twigs of Melaleuca diosmifolia, fallen off from the plant, to detoxify and remove hexavalent chromium or Cr(VI) from aqueous systems. Initial characterization by gas chromatography revealed that the selected biomaterial is one of the natural sources of eucalyptol. It constituted high concentrations of reducing compounds (iron, phenols and flavonoids). Batch studies revealed that the biosorbent (5 g L-1) was able to remove 97-99.9% of 250 mg L-1 Cr(VI) at wide-ranging pH (2-10) and temperature (24-48 °C). Adsorption kinetics was well described using the pseudo-second-order kinetic model, while the equilibrium adsorption data were interpreted in terms of the Langmuir isotherm model. The monolayer adsorption capacity was 62.5 mg g-1. Both inductively coupled plasma optical emission spectrometry and liquid chromatography analyses of the aqueous and solid phases revealed that the mechanism of Cr(VI) removal was 'adsorption-coupled reduction'. Scanning electron microscope, infrared spectroscopy and X-ray diffraction analyses of the biosorbent before and after adsorption also confirmed that both adsorption and reduction of Cr(VI) to Cr(III) followed by complexation onto functional groups of the active surface contributed to the removal of Cr(VI) from aqueous solution. The selected biomaterial effectively (99.9%) removed Cr(VI) in lake and sea water samples, highlighting its potential for remediating Cr(VI) in real environmental conditions.
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Biswas B, Sarkar B, Naidu R, 'Influence of thermally modified palygorskite on the viability of polycyclic aromatic hydrocarbon-degrading bacteria', Applied Clay Science, 134 153-160 (2016) [C1]
Thermal activation of palygorskite is considered as a simple and cost-effective method for modifying its structural and surface properties, which can be congenial for the adsorpti... [more]
Thermal activation of palygorskite is considered as a simple and cost-effective method for modifying its structural and surface properties, which can be congenial for the adsorptive removal of environmental contaminants. However, for a more efficient removal of organic contaminants like polycyclic aromatic hydrocarbons (PAH), clay-microbial synergy combining both adsorption and biodegradation is an emerging strategy. In this study, we investigated the compatibility of heat treated palygorskite products (100¿900 °C) with a PAH-degrading soil bacterium Burkholderia sartisoli. The mineralogical and physico-chemical properties were characterised in detail, and the bacterial adhesion to the substrate and their growth were observed in relation to these properties. The major variation in the cation exchange capacity (CEC), surface area, water content and the elemental dissolution in the aqueous medium occurred in the palygorskite products heated at extreme temperature (700¿900 °C). These changes significantly influenced the bacterial growth and attachment. The maximum viability was imparted by the palygorskite product obtained at 400 °C. Dissolution of Al from products heated above 500 °C also posed inhibitory effect on bacterial growth in the aqueous media. This study provided valuable information about the mechanisms of bacterial viability as affected by modified clay minerals, which is important for developing a novel clay-modulated-bioremediation technology.
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Kumar M, Ramanathan AL, Rahman MM, Naidu R, 'Concentrations of inorganic arsenic in groundwater, agricultural soils and subsurface sediments from the middle Gangetic plain of Bihar, India', Science of the Total Environment, 573 1103-1114 (2016) [C1]
Concentrations of inorganic forms [arsenite, As(III) and arsenate, As(V) of arsenic (As) present in groundwater, agricultural soils and subsurface sediments located in the middle ... [more]
Concentrations of inorganic forms [arsenite, As(III) and arsenate, As(V) of arsenic (As) present in groundwater, agricultural soils and subsurface sediments located in the middle Gangetic plain of Bihar, India were determined. Approximately 73% of the groundwater samples (n¿=¿19) show As(III) as the dominant species while 27% reveals As(V) was the dominant species. The concentration of As(III) in agricultural soil samples varies from not detectable to 40¿µg/kg and As(V) was observed as the major species (ranging from 1050 to 6835¿µg/kg) while the total As concentration varied from 3528 to 14,690¿µg/kg. Total extracted concentration of As was higher in the subsurface sediments (range 9119¿20,056¿µg/kg in Methrapur and 4788¿19,681¿µg/kg in Harail Chapar) than the agricultural soil, indicating the subsurface sediment as a source of As. Results of X-ray diffraction (XRD) and environmental scanning electron microscope (ESEM) revealed the presence of hematite and goethite throughout the vertical section below while magnetite was observed only in the upper oxidized layer at Methrapur and Harail Chapar. Alteration of Fe-oxides and presence of fibrous goethite indicating presence of diagenetic sediment. Siderite plays a crucial role as sinks to the As in subsurface sediments. The study also concluded that decomposition of organic matter present in dark and grey sections promote the redox conditions and trigger mobilization of As into groundwater.
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Islam S, Rahman MM, Islam MR, Naidu R, 'Arsenic accumulation in rice: Consequences of rice genotypes and management practices to reduce human health risk', Environment International, 96 139-155 (2016) [C1]
Rice is an essential staple food and feeds over half of the world's population. Consumption of rice has increased from limited intake in Western countries some 50¿years ago t... [more]
Rice is an essential staple food and feeds over half of the world's population. Consumption of rice has increased from limited intake in Western countries some 50¿years ago to major dietary intake now. Rice consumption represents a major route for inorganic arsenic (As) exposure in many countries, especially for people with a large proportion of rice in their daily diet as much as 60%. Rice plants are more efficient in assimilating As into its grains than other cereal crops and the accumulation may also adversely affect the quality of rice and their nutrition. Rice is generally grown as a lowland crop in flooded soils under reducing conditions. Under these conditions the bioavailability of As is greatly enhanced leading to excessive As bioaccumulation compared to that under oxidizing upland conditions. Inorganic As species are carcinogenic to humans and even at low levels in the diet pose a considerable risk to humans. There is a substantial genetic variation among the rice genotypes in grain-As accumulation as well as speciation. Identifying the extent of genetic variation in grain-As concentration and speciation of As compounds are crucial to determining the rice varieties which accumulate low inorganic As. Varietal selection, irrigation water management, use of fertilizer and soil amendments, cooking practices etc. play a vital role in reducing As exposure from rice grains. In the meantime assessing the bioavailability of As from rice is crucial to understanding human health exposure and reducing the risk.
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Datta B, Durand F, Laforge S, Prakash O, Esfahani HK, Chadalavada S, Naidu R, 'Preliminary Hydrogeologic Modeling and Optimal Monitoring Network Design for a Contaminated Abandoned Mine Site Area: Application of Developed Monitoring Network Design Software', Journal of Water Resource and Protection, 08 46-64 (2016) [C1]
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Abbasi S, Lamb DT, Palanisami T, Kader M, Matanitobua V, Megharaj M, Naidu R, 'Bioaccessibility of barium from barite contaminated soils based on gastric phase in vitro data and plant uptake', Chemosphere, 144 1421-1427 (2016) [C1]
Barite contamination of soil commonly occurs from either barite mining or explorative drilling operations. This work reported in vitro data for barite contaminated soils using the... [more]
Barite contamination of soil commonly occurs from either barite mining or explorative drilling operations. This work reported in vitro data for barite contaminated soils using the physiologically based extraction test (PBET) methodology. The existence of barite in plant tissue and the possibility of 'biomineralised' zones was also investigated using Scanning Electron Microscopy. Soils with low barium (Ba) concentrations showed a higher proportion of Ba extractability than barite rich samples. Barium uptake to spinach from soil was different between short term spiking studies and field weathered soils. Furthermore, Ba crystals were not evident in spinach tissue or acid digest solutions grown in barium nitrate spiked soils despite high accumulation. Barite was found in the plant digest solutions from barite contaminated soils only. Results indicate that under the conservative assumptions made, a child would need to consume extreme quantities of soil over an extended period to cause chronic health problems.
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Chekli L, Bayatsarmadi B, Sekine R, Sarkar B, Shen AM, Scheckel KG, et al., 'Analytical characterisation of nanoscale zero-valent iron: A methodological review', Analytica Chimica Acta, 903 13-35 (2016) [C1]
Zero-valent iron nanoparticles (nZVI) have been widely tested as they are showing significant promise for environmental remediation. However, many recent studies have demonstrated... [more]
Zero-valent iron nanoparticles (nZVI) have been widely tested as they are showing significant promise for environmental remediation. However, many recent studies have demonstrated that their mobility and reactivity in subsurface environments are significantly affected by their tendency to aggregate. Both the mobility and reactivity of nZVI mainly depends on properties such as particle size, surface chemistry and bulk composition. In order to ensure efficient remediation, it is crucial to accurately assess and understand the implications of these properties before deploying these materials into contaminated environments. Many analytical techniques are now available to determine these parameters and this paper provides a critical review of their usefulness and limitations for nZVI characterisation. These analytical techniques include microscopy and light scattering techniques for the determination of particle size, size distribution and aggregation state, and X-ray techniques for the characterisation of surface chemistry and bulk composition. Example characterisation data derived from commercial nZVI materials is used to further illustrate method strengths and limitations. Finally, some important challenges with respect to the characterisation of nZVI in groundwater samples are discussed.
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Mandal S, Thangarajan R, Bolan NS, Sarkar B, Khan N, Ok YS, Naidu R, 'Biochar-induced concomitant decrease in ammonia volatilization and increase in nitrogen use efficiency by wheat', CHEMOSPHERE, 142 120-127 (2016) [C1]
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Xia Q, Peng C, Lamb D, Mallavarapu M, Naidu R, Ng JC, 'Bioaccessibility of arsenic and cadmium assessed for in vitro bioaccessibility in spiked soils and their interaction during the Unified BARGE Method (UBM) extraction', Chemosphere, 147 444-450 (2016) [C1]
Recent decades have seen a growing popularity of in vitro bioaccessibility being utilised as a screening tool in human health risk assessment. However the existing bioaccessibilit... [more]
Recent decades have seen a growing popularity of in vitro bioaccessibility being utilised as a screening tool in human health risk assessment. However the existing bioaccessibility studies only focus on single contaminant. Considering human are likely to ingest multi-contaminants, these contaminants could interact within human gastrointestinal tract which may lead to an increase or decrease in bioaccessibility. In this study, seven different types of soil were spiked with arsenic (As) or cadmium (Cd) and aged for one year. The effects of soil properties on the bioaccessibility were examined. Moreover, the interaction between As and Cd in simulated human digestive system was studied by mixing As-spiked soil with Cd-spiked soil of the same type during bioaccessibility test. Results shows the bioaccessibility of As ranged from 40 ± 2.8 to 95 ± 1.3% in the gastric phase and 16 ± 2.0 to 96 ± 0.8% in the intestinal phase whilst a significant difference was observed between Cd gastric bioaccessibility (72 ± 4.3 to 99 ± 0.8%) and intestinal bioaccessibility (6.2 ± 0.3 to 45 ± 2.7%). Organic carbon, iron oxide and aluminium oxide were key parameters influencing the bioaccessibility of As (gastric and intestinal phases) and Cd (intestinal phase). No interactions between As and Cd during bioaccessibility test were observed in any soils, which indicates As and Cd may age independently and did not interact while being solubilised during bioaccessibility test. Thus additive effect may be proposed when estimating the bioaccessibility of mixtures of independently-aged As and Cd in soils.
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Laghari M, Naidu R, Xiao B, Hu Z, Mirjat MS, Hu M, et al., 'Recent developments in biochar as an effective tool for agricultural soil management: a review', JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, 96 4840-4849 (2016) [C1]
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Sarkar B, Neumann A, Naidu R, 'Clay and fine particle-based materials for environmental technologies and clean up', APPLIED CLAY SCIENCE, 134 69-70 (2016)
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2016 |
Ramakrishnan P, Nagarajan S, Thiruvenkatam V, Palanisami T, Naidu R, Mallavarapu M, Rajendran S, 'Cation doped hydroxyapatite nanoparticles enhance strontium adsorption from aqueous system: A comparative study with and without calcination', APPLIED CLAY SCIENCE, 134 136-144 (2016) [C1]
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Chekli L, Brunetti G, Marzouk ER, Maoz-Shen A, Smith E, Naidu R, et al., 'Evaluating the mobility of polymer-stabilised zero-valent iron nanoparticles and their potential to co-transport contaminants in intact soil cores', ENVIRONMENTAL POLLUTION, 216 636-645 (2016) [C1]
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Matheyarasu R, Seshadri B, Bolan NS, Naidu R, 'Assessment of nitrogen losses through nitrous oxide from abattoir wastewater-irrigated soils', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 23 22633-22646 (2016) [C1]
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Prasath A, Panneerselvan L, Provatas A, Naidu R, Megharaj M, 'Genotoxicity assessment of acute exposure of 2, 4-dinitroanisole, its metabolites and 2, 4, 6-trinitrotoluene to Daphnia carinata', ECOTOXICOLOGY, 25 1873-1879 (2016) [C1]
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Kader M, Lamb DT, Wang L, Megharaj M, Naidu R, 'Predicting copper phytotoxicity based on pore-water pCu', ECOTOXICOLOGY, 25 481-490 (2016) [C1]
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Xia Q, Peng C, Lamb D, Kader M, Mallavarapu M, Naidu R, Ng JC, 'Effects of arsenic and cadmium on bioaccessibility of lead in spiked soils assessed by Unified BARGE Method', CHEMOSPHERE, 154 343-349 (2016) [C1]
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Kader M, Lamb DT, Mahbub KR, Megharaj M, Naidu R, 'Predicting plant uptake and toxicity of lead (Pb) in long-term contaminated soils from derived transfer functions', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 23 15460-15470 (2016) [C1]
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Matheyarasu R, Bolan NS, Naidu R, 'Abattoir Wastewater Irrigation Increases the Availability of Nutrients and Influences on Plant Growth and Development', Water, Air, and Soil Pollution, 227 (2016) [C1]
This study evaluated the effects of abattoir wastewater irrigation on plant growth and development. The soils used in this study were collected from Primo Smallgoods Abattoir (Por... [more]
This study evaluated the effects of abattoir wastewater irrigation on plant growth and development. The soils used in this study were collected from Primo Smallgoods Abattoir (Port Wakefield, South Australia) at different sites such as currently irrigated (CI), currently not irrigated (CNI) and soil outside the irrigation area as control (CTRL). A completely randomised block design was employed for the plant growth experiment, where four crops (Pennisetum purpureum, Medicago sativa, Sinapis alba and Helianthus annuus) were grown separately on three different soils (CI, CNI and CTRL) in plastic pots. Two types of water (tap water and wastewater) and two loadings were applied throughout the planting period based on the field capacity (FC 100 and 150¿%). The overall dry matter yield was compared between the soils and treatments. Under wastewater irrigation, among the four species grown in the CI soil, P. purpureum (171¿g) and H. annuus (151¿g) showed high biomass yields, followed by S. alba (115¿g) and M. sativa (31¿g). The plants grown under tap water showed about 70¿% lower yields compared to the abattoir wastewater irrigation (AWW). Similar trends in the biomass yields were observed for CNI and CTRL soils under the two water treatments, with the biomass yields in the following order CI > CNI > CTRL soils. The results confirm the beneficial effects of AWW at the greenhouse level. However, a proper cropping pattern and wastewater irrigation management plan is essential to utilise the nutrients available in the wastewater-irrigated land treatment sites. The increase in fertility is evident from the effects of wastewater on biomass growth and also the abundance of nutrients accumulated in plants. A mass balance calculation on the applied, residual and the plant-accumulated nutrients over a few cropping periods will help us in understanding the nutrient cycling processes involved in the abattoir-irrigated land treatment sites, which will serve as an effective tool for the environmental management.
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Kuppusamy S, Thavamani P, Megharaj M, Lee YB, Naidu R, 'Kinetics of PAH degradation by a new acid-metal-tolerant Trabulsiella isolated from the MGP site soil and identification of its potential to fix nitrogen and solubilize phosphorous', JOURNAL OF HAZARDOUS MATERIALS, 307 99-107 (2016) [C1]
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Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Soil bacterial strains with heavy metal resistance and high potential in degrading diesel oil and n-alkanes', International Journal of Environmental Science and Technology, 13 2863-2874 (2016) [C1]
Four bacterial strains, capable of degrading diesel oil, n-alkanes or hexadecane, were isolated from soils contaminated with petroleum oil and identified. Strains of Pseudomonas s... [more]
Four bacterial strains, capable of degrading diesel oil, n-alkanes or hexadecane, were isolated from soils contaminated with petroleum oil and identified. Strains of Pseudomonas sp., Pseudomonas putida TPHK-1 and Pseudomonas aeruginosa TPHK-4, were more efficient in degrading high concentrations of the hydrocarbons than the other two strains, Stenotrophomonas maltophilia TPHK-2 and Acenitobacter sp. TPHK-3. P. putida TPHK-1 exhibited tolerance to very high concentrations of heavy metals such as cadmium, lead, zinc and copper. The innate ability of P. putida TPHK-1, as evidenced by the amplified genes alkB1 and alkB2 that encode alkane hydroxylases, and cat12o and cat23o coding for catechol dioxygenase, in degrading diesel oil in the presence of heavy metals is far greater than that of the strains reported in the literature. Heavy metal tolerance coupled with rapid degradation of hydrocarbons, even at high concentrations, suggests that P. putida TPHK-1 has a great potential in remediating soils contaminated with mixtures of hydrocarbons and heavy metals.
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Liu E, Sarkar B, Wang L, Naidu R, 'Copper-complexed clay/poly-acrylic acid composites: Extremely efficient adsorbents of ammonia gas', Applied Clay Science, 121-122 154-161 (2016) [C1]
Work reported in this manuscript takes into consideration the possible use of NH3 gas by terrorists and the potential for an effective and rapid removal of such toxic substance fr... [more]
Work reported in this manuscript takes into consideration the possible use of NH3 gas by terrorists and the potential for an effective and rapid removal of such toxic substance from air using a modified clay material. In this study, a series of clay/polymer composites were synthesised for ammonia gas (NH3) adsorption. The adsorbents were prepared by polymerisation of acrylic acid with N,N'-methylenebisacrylamide (MBA) as cross-linker in the presence of a large amount of highly dispersed clay nanoparticles, followed by interaction with copper ions (Cu2+). Two kinds of clays were used. One was an acid-treated bentonite that had a specific surface area (SSA) of 395 m2/g and the other was natural palygorskite with a SSA of 87 m2/g. The materials were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption and Fourier transform infrared spectroscopy (FTIR). The materials' ability to remove NH3 was investigated using NH3 breakthrough dynamic test while the strength of NH3 retention was characterised by Thermogravimetric Analysis (TGA) coupled with FTIR. The results indicate that clay/poly-acrylic acid composites are highly efficient adsorbents of NH3 after binding with Cu2+. Trapping NH3 on such adsorbents can lead to colour change and this makes it possible to predict the lifetime of the adsorption bed visually. In addition, the result of NH3 release from the material following adsorption showed that majority of the adsorbed NH3 desorbed at temperature above 180°C. The clay/polymer composites can potentially be used in air filters. They may provide an effective and cheap way for removing NH3 from contaminated air.
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Kuppusamy S, Thavamani P, Megharaj M, Lee YB, Naidu R, 'Polyaromatic hydrocarbon (PAH) degradation potential of a new acid tolerant, diazotrophic P-solubilizing and heavy metal resistant bacterium Cupriavidus sp. MTS-7 isolated from long-term mixed contaminated soil', Chemosphere, 162 31-39 (2016) [C1]
An isolate of Cupriavidus (strain MTS-7) was identified from a long-term PAHs and heavy metals mixed contaminated soil with the potential to biodegrade both LMW and HMW PAHs with ... [more]
An isolate of Cupriavidus (strain MTS-7) was identified from a long-term PAHs and heavy metals mixed contaminated soil with the potential to biodegrade both LMW and HMW PAHs with added unique traits of acid and alkali tolerance, heavy metal tolerance, self-nutrient assimilation by N fixation and P solubilization. This strain completely degraded the model 3 (150¿mg¿L-1 Phe), 4 (150¿mg¿L-1 Pyr) and 5 (50¿mg¿L-1 BaP) ring PAHs in 4, 20 and 30 days, respectively. It could mineralize 90¿100% of PAHs (200¿mg¿L-1 of Phe and Pyr) within 15 days across pH ranging from 5 to 8 and even in the presence of toxic metal contaminations. During biodegradation, the minimum inhibitory concentrations were 5 (Cu2+) and 3 (Cd2+, Pb2+, Zn2+) mg L-1 of the potentially bioavailable metal ions and over 17¿mg¿L-1 metal levels was lethal for the microbe. Further, it could fix 217¿274¿µg¿mL-1 of N and solubilize 79¿135¿µg¿mL-1 of P while PAHs degradation. MTS-7 as a superior candidate could be thus used in the enhanced bioaugmentation and/or phytoremediation of long-term mixed contaminated sites.
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Fang C, Chen Z, Megharaj M, Naidu R, 'Potentiometric detection of AFFFs based on MIP', Environmental Technology & Innovation, 5 52-59 (2016) [C1]
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2016 |
Yirsaw BD, Megharaj M, Chen Z, Naidu R, 'Reduction of hexavalent chromium by green synthesized nano zero valent iron and process optimization using response surface methodology', Environmental Technology & Innovation, 5 136-147 (2016) [C1]
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2016 |
He W, Megharaj M, Naidu R, 'Toxicity of perfluorooctanoic acid towards earthworm and enzymatic activities in soil', Environmental Monitoring and Assessment, 188 (2016) [C1]
Perfluorooctanoic acid (PFOA) is a widespread persistent organic contaminant in the environment that has recently raised much of regulatory and public concern. Therefore, assessme... [more]
Perfluorooctanoic acid (PFOA) is a widespread persistent organic contaminant in the environment that has recently raised much of regulatory and public concern. Therefore, assessment of its ecological risk is a top priority research. Hence, this study investigated the toxicity of PFOA to beneficial microbial processes in the soil such as activities of dehydrogenase, urease and potential nitrification in addition to earthworm survival, weight loss and PFOA bioaccumulation in two contrasting soils. In general, PFOA caused inhibition of all the measured microbial processes in a dose-dependent manner and the inhibition was higher in Williamtown (WT) soil than Edinburgh (EB) soil. Thus, WT soil being sandy in nature with low clay content showed higher PFOA bioavailability and hence showed higher toxicity. There was no mortality in earthworms exposed up to 100¿mg PFOA/kilogram soil in both the soils; however, there was a significant weight loss from 25¿mg/kg onwards. This study clearly demonstrates that soil contamination of PFOA can lead to adverse effects on soil health.
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2016 |
Abbasian F, Lockington R, Megharaj M, Naidu R, 'The Biodiversity Changes in the Microbial Population of Soils Contaminated with Crude Oil', Current Microbiology, 72 663-670 (2016) [C1]
Crude oil spills resulting from excavation, transportation and downstream processes can cause intensive damage to living organisms and result in changes in the microbial populatio... [more]
Crude oil spills resulting from excavation, transportation and downstream processes can cause intensive damage to living organisms and result in changes in the microbial population of that environment. In this study, we used a pyrosequencing analysis to investigate changes in the microbial population of soils contaminated with crude oil. Crude oil contamination in soil resulted in the creation of a more homogenous population of microorganisms dominated by members of the Actinomycetales, Clostridiales and Bacillales (all belonging to Gram-positive bacteria) as well as Flavobacteriales, Pseudomonadales, Burkholderiales, Rhizobiales and Sphingomonadales (all belonging to Gram-negative bacteria). These changes in the biodiversity decreased the ratios of chemoheterotrophic bacteria at higher concentrations of crude oil contamination, with these being replaced by photoheterotrophic bacteria, mainly Rhodospirillales. Several of the dominant microbial orders in the crude oil contaminated soils are able to degrade crude oil hydrocarbons and therefore are potentially useful for remediation of crude oil in contaminated sites.
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2016 |
Mandal S, Sarkar B, Bolan N, Novak J, Ok YS, Van Zwieten L, et al., 'Designing advanced biochar products for maximizing greenhouse gas mitigation potential', Critical Reviews in Environmental Science and Technology, 46 1367-1401 (2016) [C1]
Greenhouse gas (GHG) emissions from agricultural operations continue to increase. Carbon (C)-enriched char materials like biochar have been described as a mitigation strategy. Uti... [more]
Greenhouse gas (GHG) emissions from agricultural operations continue to increase. Carbon (C)-enriched char materials like biochar have been described as a mitigation strategy. Utilization of biochar material as a soil amendment has been demonstrated to provide potentially greater soil GHG suppression due to its interactions in the soil system. However, these effects are variable and the duration of the impact remains uncertain. Various (nano)materials can be used to modify chars to obtain surface functionality to mitigate GHG emissions. This review critically focusses on the innovative methodologies for improving char efficiency, underpinning GHG mitigation and C sequestration.
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2016 |
Duan L, Naidu R, Liu Y, Dong Z, Mallavarapu M, Herde P, et al., 'Comparison of oral bioavailability of benzo[a]pyrene in soils using rat and swine and the implications for human health risk assessment', Environment International, 94 95-102 (2016) [C1]
Background: There are many uncertainties concerning variations in benzo[a]pyrene (B[a]P) soil guidelines protecting human health based on carcinogenic data obtained in animal stud... [more]
Background: There are many uncertainties concerning variations in benzo[a]pyrene (B[a]P) soil guidelines protecting human health based on carcinogenic data obtained in animal studies. Although swine is recognised as being much more representative of the human child in terms of body size, gut physiology and genetic profile the rat/mice model is commonly used in practice. Objectives: We compare B[a]P bioavailability using a rat model to that estimated in a swine model, to investigate the correlation between these two animal models. This may help reduce uncertainty in applying bioavailability to human health risk assessment. Methods: Twelve spiked soil samples and a spiked silica sand (reference material) were dosed to rats in parallel with a swine study. B[a]P bioavailability was estimated by the area under the plasma B[a]P concentration-time curve (AUC) and faecal excretion as well in the rats. Direct comparison between the two animal models was made for: firstly, relative bioavailability (RB) using AUC assay; and secondly, the two assays in the rat model. Results: Both AUC and faecal excretion assays showed linear dose-response for the reference material. However, absolute bioavailability was significantly higher when using faecal excretion assay (p < 0.001). In aged soils faecal excretion estimated based on solvent extraction was not accurate due to the form of non-extractable fraction through ageing. A significant correlation existed between the two models using RB for soil samples (RBrat = 0.26RBswine + 17.3, R2 = 0.70, p < 0.001), despite the regression slope coefficient revealing that the rat model would underestimate RB by about one quarter compared to using swine. Conclusions: In the comparison employed in this study, an interspecies difference of four in RB using AUC assay was identified between the rat and swine models regarding pharmacokinetic differences, which supported the body weight scaling method recommended by US EPA. Future research should focus on the carcinogenic competency (pharmacodynamics) used in experiment animals and humans.
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2016 |
Wang L, Fang C, Cheng Y, Lamb D, Chen Z, Megharaj M, Naidu R, 'A practical way to make solid-state reference electrodes', Journal of Biochemistry and Analytical studies, 1 1-5 (2016) [C1]
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2016 |
Mandal A, Biswas B, Sarkar B, Patra AK, Naidu R, 'Surface tailored organobentonite enhances bacterial proliferation and phenanthrene biodegradation under cadmium co-contamination', Science of the Total Environment, 550 611-618 (2016) [C1]
Co-contamination of soil and water with polycyclic aromatic hydrocarbon (PAH) and heavy metals makes biodegradation of the former extremely challenging. Modified clay-modulated mi... [more]
Co-contamination of soil and water with polycyclic aromatic hydrocarbon (PAH) and heavy metals makes biodegradation of the former extremely challenging. Modified clay-modulated microbial degradation provides a novel insight in addressing this issue. This study was conducted to evaluate the growth and phenanthrene degradation performance of Mycobacterium gilvum VF1 in the presence of a palmitic acid (PA)-grafted Arquad® 2HT-75-based organobentonite in cadmium (Cd)-phenanthrene co-contaminated water. The PA-grafted organobentonite (ABP) adsorbed a slightly greater quantity of Cd than bentonite at up to 30 mg L-1 metal concentration, but its highly negative surface charge imparted by carboxylic groups indicated the potential of being a significantly superior adsorbent of Cd at higher metal concentrations. In systems co-contained with Cd (5 and 10 mg L-1), the Arquad® 2HT-75-modified bentonite (AB) and PA-grafted organobentonite (ABP) resulted in a significantly higher (72-78%) degradation of phenanthrene than bentonite (62%) by the bacterium. The growth and proliferation of bacteria were supported by ABP which not only eliminated Cd toxicity through adsorption but also created a congenial microenvironment for bacterial survival. The macromolecules produced during ABP-bacteria interaction could form a stable clay-bacterial cluster by overcoming the electrostatic repulsion among individual components. Findings of this study provide new insights for designing clay modulated PAH bioremediation technologies in mixed-contaminated water and soil.
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2016 |
Nirola R, Megharaj M, Venkateswarlu K, Aryal R, Correll R, Naidu R, 'Assessment of metal toxicity and bioavailability in metallophyte leaf litters and metalliferous soils using Eisenia fetida in a microcosm study', Ecotoxicology and Environmental Safety, 129 264-272 (2016) [C1]
The leaf litters of tree species, Acacia pycnantha (Ap) and Eucalyptus camaldulensis (Ec), predominantly growing at an abandoned copper (Cu) mine and mine soils including controls... [more]
The leaf litters of tree species, Acacia pycnantha (Ap) and Eucalyptus camaldulensis (Ec), predominantly growing at an abandoned copper (Cu) mine and mine soils including controls, were assessed for determining the metal toxicity and bioavailability using earthworm species Eisenia fetida, in a microcosm. Significant reduction in body weight as well as mortality were observed when the worms were introduced into mine soil or its combination with mine Ap litter. Virtually, there were no juveniles when the worms were fed on substratum that contained mine soil or mine leaf litter. The extent of bioaccumulation was dependent on water-soluble fraction of a metal in soil. The accumulation of cadmium, lead and copper in worm tissue was significantly more in treatments that received mine soil with or without mine leaf litter. However, the tissue concentration of zinc did not differ much in earthworms irrespective of its exposure to control or contaminated samples. Mine leaf litter from Ec, a known Cu hyperaccumulator, was more hospitable to earthworm survival and juvenile than that of Ap litter. Validation of the data on bioaccumulation of metals indicated that the mine leaf litter significantly contributed to metal bioavailability. However, it was primarily the metal concentration in mine soil that was responsible for earthworm toxicity and bioavailability. Our data also indicate that detrivores like earthworm is greatly responsible for heavy metal transfer from mines into the ecosystem.
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2016 |
Chen Y, Yu B, Lin J, Naidu R, Chen Z, 'Simultaneous adsorption and biodegradation (SAB) of diesel oil using immobilized Acinetobacter venetianus on porous material', Chemical Engineering Journal, 289 463-470 (2016) [C1]
This paper investigated modified bamboo charcoal (MBC) as a cheap, abundant and alternative cell immobilization matrix for biodegrading diesel oil. The immobilized microorganism&a... [more]
This paper investigated modified bamboo charcoal (MBC) as a cheap, abundant and alternative cell immobilization matrix for biodegrading diesel oil. The immobilized microorganism's degradation capacity was compared to its free form counterparts, namely planktonic and immobilized bacteria which degraded relatively high amounts of diesel oil (>80%). Acinetobacter venetianus immobilized on MBC demonstrated superior efficiency in degrading diesel oil (94%) compared to planktonic cells culture (82%) over a 3-day period. Moreover, the simultaneous adsorption and biodegradation of diesel oil using these immobilized cells fitted well to the pseudo second order (R2 > 0.99). Scanning electron microscopy (SEM) revealed that through absorption, cells attached well to the cavum of MBC stalk cells. Fourier transform infrared analysis (FTIR) revealed that a large number of bands at 1300-1500 cm-1 existed, demonstrating that the diesel oil was degraded and new bands were formed. Gas Chromatography Mass Spectrum (GC-MS) analysis indicated the immobilized cells could degrade diesel oil into esters and aldehydes. Results justified the applicability of MBC as the carrier matrix for immobilizing microorganisms in removing diesel oil compounds from industrial wastewater.
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2016 |
Liu E, Sarkar B, Chen Z, Naidu R, 'Decontamination of chlorine gas by organic amine modified copper-exchanged zeolite', Microporous and Mesoporous Materials, 225 450-455 (2016) [C1]
Removal of chlorine gas (Cl2) from air is of critical requirement in order to address point-source emissions possibly during a terrorist attack or an industrial accident resulting... [more]
Removal of chlorine gas (Cl2) from air is of critical requirement in order to address point-source emissions possibly during a terrorist attack or an industrial accident resulting in Cl2 contamination of the atmosphere. In this work, copper (Cu) exchanged zeolite Y (CuY) was functionalised with triethylenediamine (TEDA) and the capacity to remove Cl2 was evaluated. The materials were characterised by nitrogen (N2) adsorption-desorption studies, Fourier Transform Infrared (FTIR) spectroscopy and X-ray Photoelectron Spectroscopy (XPS). The materials' ability to remove Cl2 was investigated via a dynamic breakthrough test. Copper exchanged zeolite displayed a low adsorption of Cl2 in spite of its large surface area. However, Cl2 removal greatly improved following functionalisation with TEDA. XPS analysis revealed that Cl2 was removed via a catalytic hydrolysis reaction where adsorbed water vapour transformed Cl2 into Cl- which could be further trapped in the zeolite structural framework. Moisture could increase the Cl2 removal capacity, but the competition for adsorption between water and chlorine molecules was also observed. The spent adsorbent after exposure to Cl2 could be easily recycled with an excessive water vapour treatment. The reusability was also investigated and the adsorbent could be used for more than five times. This material can potentially be used in air filters. It may provide an efficient way for decontaminating Cl2 during a terrorist attack or an industrial accident.
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2016 |
Bahar MM, Megharaj M, Naidu R, 'Influence of phosphate on toxicity and bioaccumulation of arsenic in a soil isolate of microalga Chlorella sp.', Environmental Science and Pollution Research, 23 2663-2668 (2016) [C1]
In this study, the toxicity, biotransformation and bioaccumulation of arsenite and arsenate in a soil microalga, Chlorella sp., were investigated using different phosphate levels.... [more]
In this study, the toxicity, biotransformation and bioaccumulation of arsenite and arsenate in a soil microalga, Chlorella sp., were investigated using different phosphate levels. The results indicated that arsenate was highly toxic than arsenite to the alga, and the phosphate limitation in growth media greatly enhanced arsenate toxicity. The uptake of arsenate in algal cells was more than that of arsenite, and the predominant species in the growth media was arsenate after 8¿days of exposure to arsenite or arsenate, indicating arsenite oxidation by this microalga. Arsenate reduction was also observed when the alga was incubated in a phosphate-limiting growth medium. Similar to the process of biotransformation, the alga accumulated more arsenic when it was exposed to arsenate and preferably more in a phosphate-limiting condition. Although phosphate significantly influences the biotransformation and bioaccumulation of arsenic, the oxidizing ability and higher accumulation capacity of this alga have great potential for its application in arsenic bioremediation.
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2016 |
Wang L, Cheng Y, Lamb D, Chen Z, Lesniewski P, Mallavarapu M, Naidu R, 'Simultaneously determining multi-metal ions using an Ion Selective Electrode array system', Environmental Technology & Innovation, 6 165-176 (2016) [C1]
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2016 |
Kunhikrishnan A, Thangarajan R, Bolan NS, Xu Y, Mandal S, Gleeson DB, et al., 'Functional Relationships of Soil Acidification, Liming, and Greenhouse Gas Flux', Advances in Agronomy, 139 1-71 (2016) [C1]
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2016 |
Lamb DT, Kader M, Ming H, Wang L, Abbasi S, Megharaj M, Naidu R, 'Predicting plant uptake of cadmium: validated with long-term contaminated soils', ECOTOXICOLOGY, 25 1563-1574 (2016) [C1]
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2016 |
Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Naidu R, 'Agronomic and remedial benefits and risks of applying biochar to soil: Current knowledge and future research directions', Environment International, 87 1-12 (2016) [C1]
'Biochar' represents an emerging technology that is increasingly being recognized for its potential role in carbon sequestration, reducing greenhouse gas emissions, wast... [more]
'Biochar' represents an emerging technology that is increasingly being recognized for its potential role in carbon sequestration, reducing greenhouse gas emissions, waste management, renewable energy, soil improvement, crop productivity enhancement and environmental remediation. Published reviews have so far focused mainly on the above listed agronomic and environmental benefits of applying biochar, yet paid little or no attention to its harmful effects on the ecological system. This review highlights a balanced overview of the advantages and disadvantages of the pyrolysis process of biochar production, end-product quality and the benefits versus drawbacks of biochar on: (a) soil geochemistry and albedo, (b) microflora and fauna, (c) agrochemicals, (d) greenhouse gas efflux, (e) nutrients, (f) crop yield, and (g) contaminants (organic and inorganic). Future research should focus more on the unintended long-term consequences of biochar on biological organisms and their processes in the soil.
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2016 |
Kader M, Lamb DT, Megharaj M, Naidu R, 'Sorption parameters as a predictor of arsenic phytotoxicity in Australian soils', Geoderma, 265 103-110 (2016) [C1]
Arsenic (As) is a mobile and ecotoxic metalloid that is of serious concern to the environment. In this study, As phytotoxicity was studied using a dose-response approach for seven... [more]
Arsenic (As) is a mobile and ecotoxic metalloid that is of serious concern to the environment. In this study, As phytotoxicity was studied using a dose-response approach for seven contrasting soils considering 3 end-points (shoot biomass, root elongation and chlorophyll content) and focusing on predictors of toxicity. Root elongation study was carried out for 4days using both Cucumis sativus L. (cucumber) and Triticum aestivum L. (wheat) and shoot end-points with a 4week a pot study using cucumber only. Root elongation of cucumber was a substantially less sensitive indicator to As than data from the 4weeks pot study. Effective concentrations (50%)(EC50) from cucumber root elongation studies were overall 1.6 times higher than the 4week shoot data. Cucumber was however considerably more sensitive to wheat. Given the large discrepancy in phytotoxicity end points for 7 soils, root elongation data for ecotoxicological assessment should be treated with some caution. Arsenic phytotoxicity was strongly related to the sorption constants of each of the seven soils in our study. Both root elongation and shoot data were related strongly to Freundlich partitioning constants (Kf) (L/kg). Wheat and cucumber root elongation had R2 values 0.90 and 0.91 respectively, while cucumber shoot data was 0.79. The Kf values were related to soil pH and also EC50 data and, thus, shows that As phytotoxicity in our study was primarily controlled by sorption reactions. The rate of As bioaccumulation to cucumber shoots depended heavily on the soil under consideration. Chlorophyll and carotenoid content of cucumber shoots increased with As content in 3 soils and decreased in other soils.
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2016 |
Ming H, Naidu R, Sarkar B, Lamb DT, Liu Y, Megharaj M, Sparks D, 'Competitive sorption of cadmium and zinc in contrasting soils', Geoderma, 268 60-68 (2016) [C1]
The sorption behavior of cadmium (Cd(II)) and zinc (Zn(II)) on two virgin soils with different pH levels was studied using single metal and competitive dual metal systems. In the ... [more]
The sorption behavior of cadmium (Cd(II)) and zinc (Zn(II)) on two virgin soils with different pH levels was studied using single metal and competitive dual metal systems. In the single metal system, Zn exhibited a greater affinity for the alkaline soil, as indicated by the Langmuir constant (KL = 8.85 L/kg) compared with Cd (KL = 1.79 L/kg). However, much less sorption of both Zn (KL = 0.19 L/kg) and Cd (KL = 0.07 L/kg) was observed in the acidic soil. The competitive sorption data were modeled using two-metal Freundlich and Langmuir functions. The competition for metal sorption occurred in the alkaline soil only at a higher concentration of the competing metals, whereas the effect was significant even at lower concentrations in the acidic soil. The cumulative amount of both metals sorbed in the soil was similar to that of single metal systems in the studied concentration range, demonstrating that the number of sites available for sorption remained constant irrespective of the competition. This study indicated that Cd might be more mobile in a mixed-metal system than in a single-metal scenario and thus poses a serious ecotoxicological threat. This study is important for assessing the risks and developing management strategies for multiple heavy metal contaminated soils.
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2016 |
Jin X, Zheng M, Sarkar B, Naidu R, Chen Z, 'Characterization of bentonite modified with humic acid for the removal of Cu (II) and 2,4-dichlorophenol from aqueous solution', APPLIED CLAY SCIENCE, 134 89-94 (2016) [C1]
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2016 |
Kuppusamy S, Thavamani P, Megharaj M, Naidu R, 'Biodegradation of polycyclic aromatic hydrocarbons (PAHs) by novel bacterial consortia tolerant to diverse physical settings - Assessments in liquid- and slurry-phase systems', International Biodeterioration and Biodegradation, 108 149-157 (2016) [C1]
Field-scale bioremediation of PAHs contaminated soils have proved to be difficult and challenging due to inhibited growth of PAH degrading microbes. In this study, for the first t... [more]
Field-scale bioremediation of PAHs contaminated soils have proved to be difficult and challenging due to inhibited growth of PAH degrading microbes. In this study, for the first time mixed bacterial cultures designated as consortia-A and N were developed using elite metal or acid tolerant, N-fixing, P-solubilizing and biosurfactant producing PAH degraders enriched from manufactured gas plant sites. The two consortia could degrade both LMW and HMW PAHs. Kinetic studies of PAH degradation by the consortia showed the highest biodegradation rate constants (k = 0.027-0.61 day-1) and lowest half-life time (t1/2 = 1-26 days) values reported to date in liquid cultures and highlighted the use of consortium-A for the remediation of acidic soils due to its tolerance up to pH 5. Furthermore, bioaugmentation of these consortia has proven to be effective in degradation of LMW (>95%) and HMW (90%) PAHs from spiked soil slurries. Amendment of consortia-A and N exhibited 10.7 and 44.3% more total PAHs degradation, respectively than natural attenuation in 60 days even from the real long-term mixed contaminated soils. Thus the results of this study demonstrate the great potential of these novel bacterial consortia, particularly consortium-N for use in field-scale bioremediation of PAHs in long-term mixed contaminated neutral soils.
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2016 |
Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Lee YB, Naidu R, 'Potential of Melaleuca diosmifolia as a novel, non-conventional and low-cost coagulating adsorbent for removing both cationic and anionic dyes', Journal of Industrial and Engineering Chemistry, 37 198-207 (2016) [C1]
© 2016 The Korean Society of Industrial and Engineering Chemistry.The potential of dried twigs of Melaleuca diosmifolia as a novel biosorbent for removing three cationic dyes, met... [more]
© 2016 The Korean Society of Industrial and Engineering Chemistry.The potential of dried twigs of Melaleuca diosmifolia as a novel biosorbent for removing three cationic dyes, methylene blue (MB), acridine orange (AO) and malachite green (MG), and an anionic dye, eriochrome black T (EB) was evaluated in a batch adsorption process. Notably, the biosorbent removed 77-99% of both cationic and anionic dyes in a wide ranging pH of 2-10, and the reactions were endothermic. The dye adsorption equilibria were rapidly attained within 3 h. The monolayer adsorption capacity of the sorbent added at 5 g L-1 was 119.05, 126.8, 116.28 and 94.34 mg g-1 for MB, AO, MG and EB, respectively. The water extract obtained from the plant material induced fast decolourization of both categories of dyes followed by gradual flocculation, indicating its potential as a natural coagulant. Gas chromatographic analysis also indicated that the main electrostatic attraction between 1,8-cineole, 1-p-methene-8-thiol and furfural compounds of the biomaterial, and dye molecules resulted in the formation of initial supramolecular complexes which further progressed into strong aggregates, leading to precipitation of dye-biomaterial complexes. Subsequently, the overall complex mechanism of dye removal was confirmed to be a combined process of adsorption and coagulation. Consistent with the batch studies, using selected plant material in real environmental water samples also resulted in effective dye removal, highlighting its potential for use in wastewater treatment.
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2016 |
Naidu R, Jit J, Arias V, Kennedy B, 'Emerging contaminant uncertainties and policy: The chicken or the egg conundrum', Chemosphere, 154 385-390 (2016) [C1]
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2015 |
Ortega-Calvo J-J, Harmsen J, Parsons JR, Semple KT, Aitken MD, Ajao C, et al., 'From Bioavailability Science to Regulation of Organic Chemicals', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 49 10255-10264 (2015) [C1]
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2015 |
Biswas B, Sarkar B, Rusmin R, Naidu R, 'Bioremediation of PAHs and VOCs: Advances in clay mineral-microbial interaction', Environment International, 85 168-181 (2015) [C1]
Bioremediation is an effective strategy for cleaning up organic contaminants, such as polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs). Advanced biore... [more]
Bioremediation is an effective strategy for cleaning up organic contaminants, such as polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs). Advanced bioremediation implies that biotic agents are more efficient in degrading the contaminants completely. Bioremediation by microbial degradation is often employed and to make this process efficient, natural and cost-effective materials can serve as supportive matrices. Clay/modified clay minerals are effective adsorbents of PAHs/VOCs, and readily available substrate and habitat for microorganisms in the natural soil and sediment. However, the mechanism underpinning clay-mediated biodegradation of organic compounds is often unclear, and this requires critical investigation. This review describes the role of clay/modified clay minerals in hydrocarbon bioremediation through interaction with microbial agents in specific scenarios. The vision is on a faster, more efficient and cost-effective bioremediation technique using clay-based products. This review also proposes future research directions in the field of clay modulated microbial degradation of hydrocarbons.
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2015 |
Sarkar B, Liu E, McClure S, Sundaramurthy J, Srinivasan M, Naidu R, 'Biomass derived palygorskite-carbon nanocomposites: Synthesis, characterisation and affinity to dye compounds', APPLIED CLAY SCIENCE, 114 617-626 (2015) [C1]
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2015 |
Wu Y, Zeng S, Wang F, Megharaj M, Naidu R, Chen Z, 'Heterogeneous Fenton-like oxidation of malachite green by iron-based nanoparticles synthesized by tea extract as a catalyst', Separation and Purification Technology, 154 161-167 (2015) [C1]
The green synthesis of functional iron nanoparticles (Fe NPs) by tea extracts was used as a catalyst for the Fenton-like oxidation of malachite green (MG), where more than 85% of ... [more]
The green synthesis of functional iron nanoparticles (Fe NPs) by tea extracts was used as a catalyst for the Fenton-like oxidation of malachite green (MG), where more than 85% of MG was removed. The new findings are that the removal of MG by Fe NPs was based on the adsorption of MG onto iron oxide and degradation of MG by iron nanoparticles. This was confirmed by adsorption and degradation kinetics, indicating that: firstly, the adsorption kinetics follows the pseudo-first-order model; and secondly, degradation kinetics fitted well to the pseudo-second-order model. Morphology, size and changes in the Fe NPs surface were characterized using SEM, XRD, and FTIR techniques, showing that Fe<inf>2</inf>O<inf>3</inf> and Fe<inf>3</inf>O<inf>4</inf> was formed and green tea extract contained a high concentration of caffeine/polyphenols. It acted as both reducing and capping agents in the synthesis of Fe NPs. To further confirm the removal mechanism of MG by the functional Fe NPs, the degraded products were identified by FTIR and GC-MS analysis. Finally the mechanism of Fenton-like oxidation of MG based on both adsorption and degradation was proposed.
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2015 |
Naidu R, Wong MH, Nathanail P, 'Bioavailability the underlying basis for risk-based land management', Environmental Science and Pollution Research, 22 8775-8778 (2015) [C3]
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2015 |
Nguyen TC, Loganathan P, Nguyen TV, Pham TTN, Kandasamy J, Wu M, et al., 'Trace elements in road-deposited and waterbed sediments in Kogarah Bay, Sydney: enrichment, sources and fractionation', SOIL RESEARCH, 53 401-411 (2015) [C1]
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2015 |
Venkidusamy K, Megharaj M, Schröder U, Karouta F, Mohan SV, Naidu R, 'Electron transport through electrically conductive nanofilaments in Rhodopseudomonas palustris strain RP2', RSC Advances, 5 100790-100798 (2015) [C1]
Electronic dialogue between proteins is expected to be a key component of charge transport at the microbe-mineral interface (MMI) and requires complex structures. Microbial nanofi... [more]
Electronic dialogue between proteins is expected to be a key component of charge transport at the microbe-mineral interface (MMI) and requires complex structures. Microbial nanofilaments are one such structure produced in energetically engineered environments. These nanostructures consist of natural protein electronic conduits which can target the microbe-mineral interface and facilitate charge transport over a distance. Nanofilaments are phylogenetically diverse inducible extracellular appendages, and have the potential to serve as organic electronic conductors. However, recent investigations on such microbial nanofilaments have been confined to a few bacterial genera such as Geobacter, Shewanella and Synechocystis. Here, we report the evidence for longitudinal electron transport through inducible nanofilaments produced by another genus, the metabolically versatile photosynthetic, iron(iii) respiring bacterium Rhodopseudomonas palustris strain RP2, in photic, iron(iii) oxide-rich environments. In contrast, chemosynthetic dark-grown anoxic cells are weak in their ability to reduce ferric-oxide and no longer produce extracellular structures. Independent evaluation techniques illustrate the induction of extracellular filaments and their electrical properties. Scanning probe and nanofabricated electrode measurements provide conclusive evidence for the occurrence of direct charge transfer along the length and radius of nanofilaments from strain RP2. These findings not only expand our knowledge of the range of bacteria known to produce nanofilaments but also provide further research opportunities in the field of bionanotechnology, sustainable remediation (bioelectrochemical remediation systems) in contaminated sites (petroleum hydrocarbons) and MMI process at photic environments.
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2015 |
Kuppusamy S, Thavamani P, Megharaj M, Naidu R, 'Bioremediation potential of natural polyphenol rich green wastes: A review of current research and recommendations for future directions', Environmental Technology and Innovation, 4 17-28 (2015) [C1]
'Green waste' (food, agro-industrial and forest residues) is a renowned valuable resource of polyphenols. Natural polyphenols are relatively efficient in the clean-up of... [more]
'Green waste' (food, agro-industrial and forest residues) is a renowned valuable resource of polyphenols. Natural polyphenols are relatively efficient in the clean-up of environmental pollutants based on their unique traits of chelation, adsorption, reduction, complexation, nutrient cycling, antibacterial effects and plant growth promotion. These significant traits have found emerging applications in the removal of heavy metals, pathogenic bacteria and dyes from contaminated soil and water through existing bioremedial techniques such as biosorption, phytoextraction and coagulation. Increasingly, polyphenol-rich natural extracts harnessed for green nanoparticle synthesis (production of particles between 1 and 100 nm in size using biological entities such as microorganisms or plant biomass) have found promising use as a remedial agent in the detoxification of toxic pollutants. However, current bioremediation approaches do not sufficiently exploit natural polyphenols, which are abundantly available and are non-toxic. This review examines the extent of natural polyphenol availability in green waste, and provides a critical view on the existing remedial options, knowledge gaps and hence scope for future research. It highlights the use of natural polyphenol-rich green wastes as nanofertilizers, bioamendments, biofilters and bacteriostats. Field application strategies such as microbe-assisted phytoremediation, bioaugmention and biostimulation are also emphasized, showing the multifunctional biotechnological potentials offered by natural polyphenols.
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2015 |
Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Toxicity and oxidative stress induced by used and unused motor oil on freshwater microalga, Pseudokirchneriella subcapitata', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 22 8890-8901 (2015) [C1]
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2015 |
Thavamani P, Smith E, Kavitha R, Mathieson G, Megharaj M, Srivastava P, Naidu R, 'Risk based land management requires focus beyond the target contaminants-A case study involving weathered hydrocarbon contaminated soils', Environmental Technology and Innovation, 4 98-109 (2015) [C1]
Irrespective of the nature of contamination, the use of total contaminant loading as a measure of risk together with conservative policy guidance is proving major stumbling block ... [more]
Irrespective of the nature of contamination, the use of total contaminant loading as a measure of risk together with conservative policy guidance is proving major stumbling block towards remediation of contaminated sites. The objective of this study was to investigate the use of risk based approach to manage contaminated sites at field scale. This study recognizes the presence of weathered hydrocarbon compounds in long-term total petroleum hydrocarbon (TPH) contaminated soils and that such compounds may not pose risk to local receptors. A multispecies ecotoxicological assessment was used to determine the potential risk from weathered hydrocarbons to the surrounding environment. The ecotoxicity of soil residual TPHs was evaluated using earthworm, water-flea, two native and two non-native Australian plants, and soil microbial activity. Plant germination was 100% in all soils but post germination, seedlings except Ryegrass failed to establish. Earthworm toxicity studies found that there was a negative impact on earthworm reproduction and mortality. Further investigation of the poor plant growth and earthworm mortality revealed that it was due to the elevated salinity that developed due to surface evaporation of the saturated calcium sulphate and not residual soil TPHs. Toxicity assessment of the soil leachate on the aquatic environment showed no effect on the survival of water-flea even though the TPH concentrations in the first year leachate were as high as 1.6 mg TPH L-1. The study concluded that the residual TPHs in soils had little impact on a range of environmental receptors. Assessment of the residual TPH ecotoxicity was complicated by the elevated salinity of stockpile soils which impacted on the earthworm and phytotoxicity assessments. Therefore results of this study suggest that it is paramount to focus beyond target contaminants while implementing risk-based management approach. Indicators for risk based assessment are considered critical for regulatory decision making. The results of this study provide a valuable input in to the risk based management of contaminated sites.
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2015 |
Azizur Rahman M, Hogan B, Duncan E, Doyle C, Rahman MM, Nguyen TV, et al., 'Ecotoxicological Effects of an Arsenic Remediation Method on Three Freshwater Organisms - Lemna disperma, Chlorella sp. CE-35 and Ceriodaphnia cf. dubia', Water, Air, and Soil Pollution, 226 1-10 (2015) [C1]
Chemical methods have been used for the remediation of arsenic (As)-contaminated water; however, ecological consequences of these methods have not been properly addressed. The pre... [more]
Chemical methods have been used for the remediation of arsenic (As)-contaminated water; however, ecological consequences of these methods have not been properly addressed. The present study evaluated the effects of the Fe-oxide-coated sand (IOCS) remediation method on As toxicity to freshwater organisms (Lemna disperma, Chlorella sp. CE-35, and Ceriodaphnia cf. dubia). The As removal efficiency by IOCS decreased substantially with time. The IOCS remediation method was less effective at suppressing the toxicity of AsV than AsIII to L. disperma but was highly effective in reducing both the AsIII and AsV toxicity to C. cf. dubia. The growth of Chlorella sp. was significantly higher (p < 0.05) in remediated and pre-remediated water than in controls (non-As-contaminated filtered Colo River water) for AsIII, while the opposite was observed for AsV, indicating that AsV is more toxic than AsIII to this microalga. Although the IOCS can efficiently remove As from contaminated water, residual As and other constituents (e.g. Fe, nitrate) in the remediated water had a significant effect on freshwater organisms.
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Nova |
2015 |
Naidu R, Channey R, McConnell S, Johnston N, Semple KT, McGrath S, et al., 'Towards bioavailability-based soil criteria: past, present and future perspectives', Environmental Science and Pollution Research, 22 8779-8785 (2015)
Bioavailability has been used as a key indicator in chemical risk assessment yet poorly quantified risk factor. Worldwide, the framework used to assess potentially contaminated si... [more]
Bioavailability has been used as a key indicator in chemical risk assessment yet poorly quantified risk factor. Worldwide, the framework used to assess potentially contaminated sites is similar, and the decisions are based on threshold contaminant concentration. The uncertainty in the definition and measurement of bioavailability had limited its application to environment risk assessment and remediation. Last ten years have seen major developments in bioavailability research and acceptance. The use of bioavailability in the decision making process as one of the key variables has led to a gradual shift towards a more sophisticated risk-based approach. Now a days, many decision makers and regulatory organisations ¿more readily accept¿ this concept. Bioavailability should be the underlying basis for risk assessment and setting remediation goals of those contaminated sites that pose risk to environmental and human health. This paper summarises the potential application of contaminant bioavailability and bioaccessibility to the assessment of sites affected by different contaminants, and the potential for this to be the underlying basis for sustainable risk assessment and remediation in Europe, North America and Australia over the coming decade.
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2015 |
Duan L, Naidu R, Liu Y, Palanisami T, Dong Z, Mallavarapu M, Semple KT, 'Effect of ageing on benzo[a]pyrene extractability in contrasting soils', Journal of Hazardous Materials, 296 175-184 (2015) [C1]
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2015 |
Huang L, Luo F, Chen Z, Megharaj M, Naidu R, 'Green synthesized conditions impacting on the reactivity of Fe NPs for the degradation of malachite green', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 137 154-159 (2015)
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2015 |
Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'The mechanism for degrading Orange II based on adsorption and reduction by ion-based nanoparticles synthesized by grape leaf extract', Journal of Hazardous Materials, 296 37-45 (2015) [C1]
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2015 |
Kuang Y, Du J, Zhou R, Chen Z, Megharaj M, Naidu R, 'Calcium alginate encapsulated Ni/Fe nanoparticles beads for simultaneous removal of Cu (II) and monochlorobenzene', Journal of Colloid and Interface Science, 447 85-91 (2015) [C1]
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2015 |
Li R, Gao Y, Jin X, Chen Z, Megharaj M, Naidu R, 'Fenton-like oxidation of 2,4-DCP in aqueous solution using iron-based nanoparticles as the heterogeneous catalyst', Journal of Colloid and Interface Science, 438 87-93 (2015) [C1]
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2015 |
Li R, Jin X, Megharaj M, Naidu R, Chen Z, 'Heterogeneous Fenton oxidation of 2,4-dichlorophenol using iron-based nanoparticles and persulfate system', Chemical Engineering Journal, 264 587-594 (2015) [C1]
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2015 |
Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Ecological implications of motor oil pollution: Earthworm survival and soil health', Soil Biology and Biochemistry, 85 72-81 (2015) [C1]
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2015 |
Rahman MM, Dong Z, Naidu R, 'Concentrations of arsenic and other elements in groundwater of Bangladesh and West Bengal, India: Potential cancer risk', Chemosphere, 139 54-64 (2015) [C1]
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2015 |
Jiang C, Xu X, Megharaj M, Naidu R, Chen Z, 'Inhibition or promotion of biodegradation of nitrate by Paracoccus sp. in the presence of nanoscale zero-valent iron', Science of the Total Environment, 530-531 241-246 (2015) [C1]
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2015 |
Rusmin R, Sarkar B, Liu Y, McClure S, Naidu R, 'Structural evolution of chitosan-palygorskite composites and removal of aqueous lead by composite beads', Applied Surface Science, 353 363-375 (2015)
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2015 |
Donner E, Scheckel K, Sekine R, Popelka-Filcoff RS, Bennett JW, Brunetti G, et al., 'Non-labile silver species in biosolids remain stable throughout 50 years of weathering and ageing', Environmental Pollution, 205 78-86 (2015) [C1]
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2015 |
Abbasian F, Lockington R, Mallavarapu M, Naidu R, 'A Comprehensive Review of Aliphatic Hydrocarbon Biodegradation by Bacteria', Applied Biochemistry and Biotechnology, 176 670-699 (2015)
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2015 |
Biswas B, Sarkar B, Mandal A, Naidu R, 'Heavy metal-immobilizing organoclay facilitates polycyclic aromatic hydrocarbon biodegradation in mixed-contaminated soil', Journal of Hazardous Materials, 298 129-137 (2015) [C1]
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2015 |
Sanderson P, Naidu R, Bolan N, Lim JE, Ok YS, 'Chemical stabilisation of lead in shooting range soils with phosphate and magnesium oxide: Synchrotron investigation', Journal of Hazardous Materials, 299 395-403 (2015) [C1]
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2015 |
Zhuang Z, Wang F, Naidu R, Chen Z, 'Biosynthesis of Pd-Au alloys on carbon fiber paper: Towards an eco-friendly solution for catalysts fabrication', Journal of Power Sources, 291 132-137 (2015)
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2015 |
Subramaniyam V, Subashchandrabose SR, Thavamani P, Megharaj M, Chen Z, Naidu R, 'Chlorococcum sp. MM11 a novel phyco-nanofactory for the synthesis of iron nanoparticles', Journal of Applied Phycology, 27 1861-1869 (2015)
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2015 |
Sanderson P, Naidu R, Bolan N, 'Effectiveness of chemical amendments for stabilisation of lead and antimony in risk-based land management of soils of shooting ranges', Environmental Science and Pollution Research, 22 8942-8956 (2015)
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2015 |
Krishnamurti GSR, Subashchandrabose SR, Megharaj M, Naidu R, 'Assessment of bioavailability of heavy metal pollutants using soil isolates of Chlorella sp.', Environmental Science and Pollution Research, 22 8826-8832 (2015)
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2015 |
Thangarajan R, Bolan NS, Naidu R, Surapaneni A, 'Effects of temperature and amendments on nitrogen mineralization in selected Australian soils', Environmental Science and Pollution Research, 22 8843-8854 (2015)
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2015 |
Duan L, Naidu R, Thavamani P, Meaklim J, Megharaj M, 'Managing long-term polycyclic aromatic hydrocarbon contaminated soils: a risk-based approach', Environmental Science and Pollution Research, 22 8927-8941 (2015)
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2015 |
Das P, Megharaj M, Naidu R, 'Perfluorooctane sulfonate release pattern from soils of fire training areas in Australia and its bioaccumulation potential in the earthworm Eisenia fetida', Environmental Science and Pollution Research, 22 8902-8910 (2015)
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2015 |
Thavamani P, Megharaj M, Naidu R, 'Metal-tolerant PAH-degrading bacteria: development of suitable test medium and effect of cadmium and its availability on PAH biodegradation', Environmental Science and Pollution Research, 22 8957-8968 (2015)
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2015 |
Subashchandrabose SR, Megharaj M, Venkateswarlu K, Naidu R, 'Interaction effects of polycyclic aromatic hydrocarbons and heavy metals on a soil microalga, Chlorococcum sp. MM11', Environmental Science and Pollution Research, 22 8876-8889 (2015)
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2015 |
Smith E, Thavamani P, Ramadass K, Naidu R, Srivastava P, Megharaj M, 'Remediation trials for hydrocarbon-contaminated soils in arid environments: Evaluation of bioslurry and biopiling techniques', International Biodeterioration and Biodegradation, 101 56-65 (2015)
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2015 |
Yirsaw BD, Megharaj M, Chen Z, Naidu R, 'Environmental application and ecological significance of nano-zero valent iron', Journal of Environmental Sciences (China), 44 88-98 (2015)
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2015 |
Zheng X, Han B, Thavamani P, Duan L, Naidu R, 'Composition, source identification and ecological risk assessment of polycyclic aromatic hydrocarbons in surface sediments of the Subei Grand Canal, China', ENVIRONMENTAL EARTH SCIENCES, 74 2669-2677 (2015)
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2015 |
Lin J, Gan L, Chen Z, Naidu R, 'Biodegradation of tetradecane using Acinetobacter venetianus immobilized on bagasse', Biochemical Engineering Journal, 100 76-82 (2015) [C1]
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2015 |
Nguyen TC, Loganathan P, Nguyen TV, Vigneswaran S, Kandasamy J, Naidu R, 'Simultaneous adsorption of Cd, Cr, Cu, Pb, and Zn by an iron-coated Australian zeolite in batch and fixed-bed column studies', Chemical Engineering Journal, 270 393-404 (2015) [C1]
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2015 |
Ramadass K, Smith E, Palanisami T, Mathieson G, Srivastava P, Megharaj M, Naidu R, 'Evaluation of constraints in bioremediation of weathered hydrocarbon-contaminated arid soils through microcosm biopile study', International Journal of Environmental Science and Technology, 12 3597-3612 (2015)
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2015 |
Pal R, Megharaj M, Kirkbride KP, Naidu R, 'Adsorption and desorption characteristics of methamphetamine, 3,4-methylenedioxymethamphetamine, and pseudoephedrine in soils', Environmental science and pollution research international, 22 8855-8865 (2015)
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2015 |
Wijayawardena MAA, Naidu R, Megharaj M, Lamb D, Thavamani P, Kuchel T, 'Influence of ageing on lead bioavailability in soils: a swine study', Environmental science and pollution research international, 22 8979-8988 (2015) [C1]
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2015 |
Wijayawardena MAA, Naidu R, Megharaj M, Lamb D, Thavamani P, Kuchel T, 'Using soil properties to predict in vivo bioavailability of lead in soils', CHEMOSPHERE, 138 422-428 (2015) [C1]
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Nova |
2015 |
Seshadri B, Bolan NS, Naidu R, 'Rhizosphere-induced heavy metal(Loid) transformation in relation to bioavailability and remediation', Journal of Soil Science and Plant Nutrition, 15 524-548 (2015) [C1]
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2015 |
Fang C, Megharaj M, Naidu R, 'Chemical oxidization of some AFFFs leads to the formation of 6:2FTS and 8:2FTS', Environmental Toxicology and Chemistry, 34 2625-2628 (2015) [C1]
The present study tested some aqueous film-forming foam (AFFF) products for the presence of or the potential to form 1H,1H,2H,2H-perfluorooctanesulfonic acid (6:2FTS) and 1H,1H,2H... [more]
The present study tested some aqueous film-forming foam (AFFF) products for the presence of or the potential to form 1H,1H,2H,2H-perfluorooctanesulfonic acid (6:2FTS) and 1H,1H,2H,2H-perfluorodecane sulfonic acid (8:2FTS). The results demonstrated the appearance of significant levels of 6:2FTS and 8:2FTS after the oxidization of those AFFFs. The authors concluded that fluorotelomer skeletons exist but are derived from those formulations of AFFFs.
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Nova |
2015 |
Dong Z, Liu Y, Duan L, Bekele D, Naidu R, 'Uncertainties in human health risk assessment of environmental contaminants: A review and perspective', Environment International, 85 120-132 (2015) [C1]
Addressing uncertainties in human health risk assessment is a critical issue when evaluating the effects of contaminants on public health. A range of uncertainties exist through t... [more]
Addressing uncertainties in human health risk assessment is a critical issue when evaluating the effects of contaminants on public health. A range of uncertainties exist through the source-to-outcome continuum, including exposure assessment, hazard and risk characterisation. While various strategies have been applied to characterising uncertainty, classical approaches largely rely on how to maximise the available resources. Expert judgement, defaults and tools for characterising quantitative uncertainty attempt to fill the gap between data and regulation requirements. The experiences of researching 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) illustrated uncertainty sources and how to maximise available information to determine uncertainties, and thereby provide an 'adequate' protection to contaminant exposure. As regulatory requirements and recurring issues increase, the assessment of complex scenarios involving a large number of chemicals requires more sophisticated tools. Recent advances in exposure and toxicology science provide a large data set for environmental contaminants and public health. In particular, biomonitoring information, in vitro data streams and computational toxicology are the crucial factors in the NexGen risk assessment, as well as uncertainties minimisation. Although in this review we cannot yet predict how the exposure science and modern toxicology will develop in the long-term, current techniques from emerging science can be integrated to improve decision-making.
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Nova |
2015 |
Arias Espana VA, Mallavarapu M, Naidu R, 'Treatment technologies for aqueous perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA): A critical review with an emphasis on field testing', Environmental Technology & Innovation, 4 168-181 (2015) [C1]
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Nova |
2015 |
Feng Y, Xiao B, Goerner K, Naidu R, 'The Influence of Catalyst and Temperature on Pine Sawdust Gasification Performance by an Externally Heated Gasifier', ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS, 37 1033-1038 (2015)
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2015 |
Singh S, Thavamani P, Megharaj M, Naidu R, 'Multifarious activities of cellulose degrading bacteria from Koala (Phascolarctos cinereus) faeces.', Journal of animal science and technology, 57 23 (2015) [C1]
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Nova |
2015 |
Nirola R, Megharaj M, Palanisami T, Aryal R, Venkateswarlu K, Ravi Naidu, 'Evaluation of metal uptake factors of native trees colonizing an abandoned copper mine a quest for phytostabilization', Journal of Sustainable Mining, 14 115-123 (2015)
Accumulation and enrichment of heavy metals in the above ground parts of Australian native Acacia pycnantha (Ap) and Eucalyptus camaldulensis (Ec) growing in an abandoned copper m... [more]
Accumulation and enrichment of heavy metals in the above ground parts of Australian native Acacia pycnantha (Ap) and Eucalyptus camaldulensis (Ec) growing in an abandoned copper mine located in Kapunda, South Australia have been studied. Cu and other metals (Na, Al, K, Ca, Fe, Zn, Cd and Pb) in plants and corresponding soils were analysed to evaluate plant interaction with soils containing heavy metals. As per the total metal analysis of leaf and corresponding soil samples, Ap accumulated 93.6 mg kg-1 of Cu in leaf while the corresponding soil concentration was 1632 mg kg-1. The Ec accumulated 5341 mg kg-1 of Cu in leaf while the concentration of this heavy metal in soil was 65 mg kg-1 in soil. The ESEM spectral analysis also showed a high leaf concentration of Cu in Ec (7%) as against only 0.12% in Ap. The average bioconcentration factor for Cu, Zn, Cd and Pb in Ec was much higher than that of Ap. Similarly, enrichment factor was more in Ec for Cu, Zn and Pb than in Ap. In contrast, translocation factor for only Zn and Cd was high in Ap. This study points out that Ec and Ap have different stabilising potential in remediating heavy metals like Cu in mined soils.
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2015 |
Rajmohan M, Naidu RM, Thamaraiselvi D, Deepasree M, 'In vivo autofluorescence spectroscopic study and evaluation of DNA damage by comet assay in smokers', Journal of Clinical and Diagnostic Research, 9 ZC16-ZC19 (2015)
Context: Tobacco is known environmental factor to alter the chemical composition of cells and the structure of DNA. Cellular level changes of smoker¿s mucosa are assessed by autof... [more]
Context: Tobacco is known environmental factor to alter the chemical composition of cells and the structure of DNA. Cellular level changes of smoker¿s mucosa are assessed by autofluorescence spectroscopy and the DNA damage can be evaluated by single cell gel electrophoresis (comet assay). Aim: To substantiate the changes in the autofluorescence due to smoking with that of early DNA damage without any clinical change. Materials and Methods: Group I consists of 20 individuals with normal mucosa and Group II consists of 40 individuals with smoking habit. Only males were included in this study and their age ranging from 25 to 35 years. In vivo fluorescence spectra from both groups were obtained by using hand held fiber optic probe attached to Varian Cary Eclipse fluorescence spectrophotometer and comet assay was carried out for normal and smokers by their peripheral blood. Statistical Analysis Used: Independent-Samples t-test was used for statistical analysis. P-value was obtained to discriminate the statistical differences between the two groups. Results: The averaged excitation and emission spectra of normal and smoker¿s mucosa showed significant differences statistically. In comet assay, the mean tail length of smoker group was higher than the normal group. The results showed statistically significant differences (p = 0.05). Conclusion: These techniques will be very useful for monitoring of very early changes of mucosa before clinical manifestation of the lesion in high risk smokers and thus prevents the occurrence of premalignant disorders and early invasive carcinoma.
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2015 |
Abbasian F, Lockington R, Megharaj M, Naidu R, 'The integration of sequencing and bioinformatics in metagenomics', REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO-TECHNOLOGY, 14 357-383 (2015) [C1]
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Nova |
2015 |
Shakoor MB, Niazi NK, Bibi I, Rahman MM, Naidu R, Dong Z, et al., 'Unraveling health risk and speciation of arsenic from groundwater in rural areas of Punjab, Pakistan', International Journal of Environmental Research and Public Health, 12 12371-12390 (2015) [C1]
This study determined the total and speciated arsenic (As) concentrations and other health-related water quality parameters for unraveling the health risk of As from drinking wate... [more]
This study determined the total and speciated arsenic (As) concentrations and other health-related water quality parameters for unraveling the health risk of As from drinking water to humans. Groundwater samples (n = 62) were collected from three previously unexplored rural areas (Chichawatni, Vehari, Rahim Yar Khan) of Punjab in Pakistan. The mean and median As concentrations in groundwater were 37.9 and 12.7 µg¿L-1 (range = 1.5¿201 µg¿L-1). Fifty three percent groundwater samples showed higher As value than WHO safe limit of 10 µg¿L-1. Speciation of As in groundwater samples (n = 13) showed the presence of inorganic As only; arsenite (As(III)) constituted 13%¿67% of total As and arsenate (As(V)) ranged from 33% to 100%. For As health risk assessment, the hazard quotient and cancer risk values were 11¿18 and 46¿600 times higher than the recommended values of US-EPA (i.e., 1.00 and 10-6, respectively). In addition to As, various water quality parameters (e.g., electrical conductivity, Na, Ca, Cl-, NO3-, SO42-, Fe, Mn, Pb) also enhanced the health risk. The results show that consumption of As-contaminated groundwater poses an emerging health threat to the communities in the study area, and hence needs urgent remedial and management measures.
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Nova |
2015 |
Li S-W, Li J, Li H-B, Naidu R, Ma LQ, 'Arsenic bioaccessibility in contaminated soils: Coupling in vitro assays with sequential and HNO3 extraction', JOURNAL OF HAZARDOUS MATERIALS, 295 145-152 (2015) [C1]
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Nova |
2015 |
Wang L, Yang D, Lamb D, Chen Z, Lesniewsk PJ, Mallavarapu M, Naidu R, 'Application of mathematical models and genetic algorithm to simulate the response characteristics of an ion selective electrode array for system recalibration', Chemometrics and Intelligent Laboratory Systems, 144 24-30 (2015) [C1]
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2015 |
Kader M, Lamb DT, Correll R, Megharaj M, Naidu R, 'Pore-water chemistry explains zinc phytotoxicity in soil', Ecotoxicology and Environmental Safety, 122 252-259 (2015) [C1]
Zinc (Zn) is a widespread soil contaminant arising from a numerous anthropogenic sources. However, adequately predicting toxicity of Zn to ecological receptors remains difficult d... [more]
Zinc (Zn) is a widespread soil contaminant arising from a numerous anthropogenic sources. However, adequately predicting toxicity of Zn to ecological receptors remains difficult due to the complexity of soil characteristics. In this study, we examined solid-solution partitioning using pore-water data and toxicity of Zn to cucumber (Cucumis sativus L.) in spiked soils. Pore-water effective concentration (ECx, x=10%, 20% and 50% reduction) values were negatively related to pH, indicating lower Zn pore water concentration were needed to cause phytotoxicity at high pH soils. Total dissolved zinc (Zn<inf>pw</inf>) and free zinc (Zn<sup>2+</sup>) in soil-pore water successfully described 78% and 80.3% of the variation in relative growth (%) in the full dataset. When the complete data set was used (10 soils), the estimated EC50<inf>pw</inf> was 450 and 79.2µM for Zn<inf>pw</inf> and Zn<sup>2+</sup>, respectively. Total added Zn, soil pore water pH (pH<inf>pw</inf>) and dissolve organic carbon (DOC) were the best predictors of Zn<inf>pw</inf> and Zn<sup>2+</sup> in pore-water. The EC10 (total loading) values ranged from 179 to 5214mg/kg, depending on soil type. Only pH measurements in soil were related to ECx total Zn data. The strongest relationship to ECx overall was pH<inf>ca</inf>, although pH<inf>w</inf> and pH<inf>pw</inf> were in general related to Zn ECx. Similarly, when a solution-only model was used to predict Zn in shoot, DOC was negatively related to Zn in shoot, indicating a reduction in uptake/ translocation of Zn from solution with increasing DOC.
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Nova |
2015 |
Mukkata K, Kantachote D, Wittayaweerasak B, Techkarnjanaruk S, Mallavarapu M, Naidu R, 'Distribution of Mercury in Shrimp Ponds and Volatilization of Hg by Isolated Resistant Purple Nonsulfur Bacteria', WATER AIR AND SOIL POLLUTION, 226 (2015) [C1]
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2015 |
Yu B, Jin X, Kuang Y, Megharaj M, Naidu R, Chen Z, 'An integrated biodegradation and nano-oxidation used for the remediation of naphthalene from aqueous solution', CHEMOSPHERE, 141 205-211 (2015) [C1]
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Nova |
2015 |
Poorvisha R, Suriyaraj SP, Thavamani P, Naidu R, Megharaj M, Bhattacharyya A, Selvakumar R, 'Synthesis and characterisation of 3-dimensional hydroxyapatite nanostructures using a thermoplastic polyurethane nanofiber sacrificial template', RSC Advances, 5 97773-97780 (2015) [C1]
In this study, we report a facile synthesis of shape controlled three dimensional hydroxyapatite nanostructures (HAp) using a sacrificial thermoplastic polyurethane (TPU) nanofibe... [more]
In this study, we report a facile synthesis of shape controlled three dimensional hydroxyapatite nanostructures (HAp) using a sacrificial thermoplastic polyurethane (TPU) nanofiber template. The TPU nanofibers synthesised using an electrospinning process were used as a template during the HAp synthesis through a precipitation process. Various HAp morphologies including distinctly placed cylindrically porous HAp architecture, coral reef like, tightly packed fibrous sheet like and nanofiber like were synthesised using the TPU nanofiber template. All the synthesised HAp were characterized using appropriate techniques like Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) attached with selected area electron diffraction (SAED), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The morphology, pore arrangement and the particle size of the HAp varied significantly with varying dimensions of the template and the template available per unit area of HAp. Hence, we have achieved four different 3D HAp morphologies using a single type of TPU nanofiber template. The TPU templated HAp nanostructures were more biodegradable than the control HAp.
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Nova |
2015 |
Wang L, Liu E, Cheng Y, Bekele DN, Lamb D, Chen Z, et al., 'Novel methodologies for automatically and simultaneously determining BTEX components using FTIR spectra', Talanta, 144 1104-1110 (2015) [C1]
This study introduced a patented novel methodological system for automatically analysis of Fourier Transform Infrared Spectrometer (FTIR) spectrum data located at 'fingerprin... [more]
This study introduced a patented novel methodological system for automatically analysis of Fourier Transform Infrared Spectrometer (FTIR) spectrum data located at 'fingerprint' region (wavenumber 670-800 cm-1), to simultaneously determinate multiple petroleum hydrocarbons (PHs) in real mixture samples. This system includes: an object oriented baseline correction; Band decomposition (curve fitting) method with mathematical optimization; and Artificial Neural Network (ANN) for determination, which is suitable for the characteristics of this IR regions, where the spectra are normally with low signal to noise ratio and high density of peaks. BTEX components are potentially lethal carcinogens and contained in many petroleum products. As a case study, six BTEX components were determinate automatically and simultaneously in mixture vapor samples. The robustness of the BTEX determination was validated using real petroleum samples, and the prediction results were compared with gas chromatography-mass spectrometry (GC-MS).
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Nova |
2015 |
Wang L, Yang D, Fang C, Chen Z, Lesniewski PJ, Mallavarapu M, Naidu R, 'Application of neural networks with novel independent component analysis methodologies to a Prussian blue modified glassy carbon electrode array', Talanta, 131 395-403 (2015) [C1]
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2015 |
Abbasian F, Lockington R, Mallavarapu M, Naidu R, 'A pyrosequencing-based analysis of microbial diversity governed by ecological conditions in the Winogradsky column', WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY, 31 1115-1126 (2015) [C1]
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Nova |
2015 |
Arias E VA, Mallavarapu M, Naidu R, 'Identification of the source of PFOS and PFOA contamination at a military air base site', Environmental Monitoring and Assessment, 187 4111-4111 (2015) [C1]
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2015 |
Lin J, Weng X, Jin X, Megharaj M, Naidu R, Chen Z, 'Reactivity of iron-based nanoparticles by green synthesis under various atmospheres and their removal mechanism of methylene blue', RSC ADVANCES, 5 70874-70882 (2015) [C1]
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Nova |
2014 |
Selvakumar R, Seethalakshmi N, Thavamani P, Naidu R, Megharaj M, 'Recent advances in the synthesis of inorganic nano/microstructures using microbial biotemplates and their applications', RSC ADVANCES, 4 52156-52169 (2014)
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2014 |
Gan L, Cheng Y, Palanisami T, Chen Z, Megharaj M, Naidu R, 'Pathways of reductive degradation of crystal violet in wastewater using free-strain Burkholderia vietnamiensis C09V', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 21 10339-10348 (2014)
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2014 |
Rahman MA, Rahman MM, Reichman SM, Lim RP, Naidu R, 'Arsenic speciation in australian-grown and imported rice on sale in Australia: Implications for human health risk', Journal of Agricultural and Food Chemistry, 62 6016-6024 (2014) [C1]
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2014 |
Kopittke PM, Wang P, Menzies NW, Naidu R, Kinraide TB, 'A web-accessible computer program for calculating electrical potentials and ion activities at cell-membrane surfaces', Plant and Soil, 375 35-46 (2014) [C1]
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2014 |
Lin C, Gan L, Chen Z, Megharaj M, Naidu R, 'Biodegradation of naphthalene using a functional biomaterial based on immobilized Bacillus fusiformis (BFN)', Biochemical Engineering Journal, 90 1-7 (2014) [C1]
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2014 |
Cai X, Gao Y, Sun Q, Chen Z, Megharaj M, Naidu R, 'Removal of co-contaminants Cu (II) and nitrate from aqueous solution using kaolin-Fe/Ni nanoparticles', Chemical Engineering Journal, 244 19-26 (2014) [C1]
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2014 |
Wang F, Gao Y, Sun Q, Chen Z, Megharaj M, Naidu R, 'Degradation of microcystin-LR using functional clay supported bimetallic Fe/Pd nanoparticles based on adsorption and reduction', Chemical Engineering Journal, 255 55-62 (2014) [C1]
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2014 |
Zha S, Cheng Y, Gao Y, Chen Z, Megharaj M, Naidu R, 'Nanoscale zero-valent iron as a catalyst for heterogeneous Fenton oxidation of amoxicillin', Chemical Engineering Journal, 255 141-148 (2014) [C1]
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2014 |
Jin X, Chen Z, Wang T, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of co-contaminants: acid brilliant violet and Cu
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2014 |
Etschmann BE, Donner E, Brugger J, Howard DL, De Jonge MD, Paterson D, et al., 'Speciation mapping of environmental samples using XANES imaging', Environmental Chemistry, 11 341-350 (2014) [C1]
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2014 |
Bhattacharya P, Naidu R, Polya DA, Mukherjee A, Bundschuh J, Charlet L, 'Arsenic in hydrological processes-Sources, speciation, bioavailability and management', JOURNAL OF HYDROLOGY, 518 279-283 (2014)
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2014 |
Shi L, Du J, Chen Z, Megharaj M, Naidu R, 'Functional kaolinite supported Fe/Ni nanoparticles for simultaneous catalytic remediation of mixed contaminants (lead and nitrate) from wastewater', Journal of Colloid and Interface Science, 428 302-307 (2014) [C1]
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2014 |
Weng X, Sun Q, Lin S, Chen Z, Megharaj M, Naidu R, 'Enhancement of catalytic degradation of amoxicillin in aqueous solution using clay supported bimetallic Fe/Ni nanoparticles', Chemosphere, 103 80-85 (2014) [C1]
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2014 |
Liu Y, Li S, Chen Z, Megharaj M, Naidu R, 'Influence of zero-valent iron nanoparticles on nitrate removal by Paracoccus sp.', Chemosphere, 108 426-432 (2014) [C1]
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2014 |
Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Green synthesis of Fe nanoparticles using eucalyptus leaf extracts for treatment of eutrophic wastewater', Science of the Total Environment, 466-467 210-213 (2014) [C1]
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2014 |
Duan L, Palanisami T, Liu Y, Dong Z, Mallavarapu M, Kuchel T, et al., 'Effects of ageing and soil properties on the oral bioavailability of benzo[a]pyrene using a swine model', Environment International, 70 192-202 (2014) [C1]
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2014 |
Kiddee P, Naidu R, Wong MH, Hearn L, Muller JF, 'Field investigation of the quality of fresh and aged leachates from selected landfills receiving e-waste in an arid climate', Waste Management, 34 2292-2304 (2014) [C1]
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2014 |
Wang T, Lin J, Chen Z, Megharaj M, Naidu R, 'Green synthesized iron nanoparticles by green tea and eucalyptus leaves extracts used for removal of nitrate in aqueous solution', Journal of Cleaner Production, 83 413-419 (2014) [C1]
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2014 |
Luo F, Chen Z, Megharaj M, Naidu R, 'Biomolecules in grape leaf extract involved in one-step synthesis of iron-based nanoparticles', RSC Advances, 4 53467-53474 (2014) [C1]
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2014 |
Lamb DT, Venkatraman K, Bolan N, Ashwath N, Choppala G, Naidu R, 'Phytocapping: An alternative technology for the sustainable management of landfill sites', Critical Reviews in Environmental Science and Technology, 44 561-637 (2014) [C1]
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2014 |
Bekele DN, Naidu R, Chadalavada S, 'Influence of spatial and temporal variability of subsurface soil moisture and temperature on vapour intrusion', Atmospheric Environment, 88 14-22 (2014) [C1]
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2014 |
Rahman MA, Rahman MM, Reichman SM, Lim RP, Naidu R, 'Heavy metals in Australian grown and imported rice and vegetables on sale in Australia: Health hazard', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 100 53-60 (2014)
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2014 |
Sanderson P, Naidu R, Bolan N, 'Ecotoxicity of chemically stabilised metal(loid)s in shooting range soils', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 100 201-208 (2014)
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2014 |
Thuy CN, Loganathan P, Tien VN, Vigneswaran S, Kandasamy J, Slee D, et al., 'Polycyclic aromatic hydrocarbons in road-deposited sediments, water sediments, and soils in Sydney, Australia: Comparisons of concentration distribution, sources and potential toxicity', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 104 339-348 (2014)
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2014 |
Zhou F, Cheng Y, Gan L, Chen Z, Megharaj M, Naidu R, 'Burkholderia vietnamiensis C09V as the functional biomaterial used to remove crystal violet and Cu(II)', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 105 1-6 (2014)
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2014 |
Rahman MA, Hogan B, Duncan E, Doyle C, Krassoi R, Rahman MM, et al., 'Toxicity of arsenic species to three freshwater organisms and biotransformation of inorganic arsenic by freshwater phytoplankton (Chlorella sp CE-35)', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 106 126-135 (2014)
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2014 |
Lin Y, Chen Z, Chen Z, Megharaj M, Naidu R, 'Decoloration of acid violet red B by bentonite-supported nanoscale zero-valent iron: Reactivity, Characterization, kinetics and reaction pathway', APPLIED CLAY SCIENCE, 93-94 56-61 (2014)
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2014 |
Seshadri B, Bolan NS, Kunhikrishnan A, Choppala G, Naidu R, 'Effect of coal combustion products in reducing soluble phosphorus in soil II: Leaching study', Water, Air, and Soil Pollution, 225 (2014) [C1]
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2014 |
Seshadri B, Kunhikrishnan A, Bolan N, Naidu R, 'Effect of industrial waste products on phosphorus mobilisation and biomass production in abattoir wastewater irrigated soil', Environmental Science and Pollution Research, 21 10013-10021 (2014) [C1]
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2014 |
Weng X, Chen Z, Chen Z, Megharaj M, Naidu R, 'Clay supported bimetallic Fe/Ni nanoparticles used for reductive degradation of amoxicillin in aqueous solution: Characterization and kinetics', COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 443 404-409 (2014)
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2014 |
Liu X, Wang F, Chen Z, Megharaj M, Naidu R, 'Heterogeneous Fenton oxidation of Direct Black G in dye effluent using functional kaolin-supported nanoscale zero iron', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 21 1936-1943 (2014)
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2014 |
Liu Y, Naidu R, 'Hidden values in bauxite residue (red mud): Recovery of metals', WASTE MANAGEMENT, 34 2662-2673 (2014)
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2014 |
Mandal S, Thangarajan R, Bolan NS, Sarkar B, Khan N, Ok YS, Naidu R, 'Biochar-induced concomitant decrease in ammonia volatilization and increase in nitrogen use efficiency by wheat', Chemosphere, (2014)
Ammonia (NH<inf>3</inf>) volatilization is a major nitrogen (N) loss from the soil, especially under tropical conditions, NH<inf>3</inf> volatilization res... [more]
Ammonia (NH<inf>3</inf>) volatilization is a major nitrogen (N) loss from the soil, especially under tropical conditions, NH<inf>3</inf> volatilization results in low N use efficiency by crops. Incubation experiments were conducted using five soils (pH 5.5-9.0), three N sources such as, urea, di-ammonium phosphate (DAP), and poultry manure (PM) and two biochars such as, poultry litter biochar (PL-BC) and macadamia nut shell biochar (MS-BC). Ammonia volatilization was higher at soil with higher pH (pH exceeding 8) due to the increased hydroxyl ions. Among the N sources, urea recorded the highest NH<inf>3</inf> volatilization (151.6mgkg<sup>-1</sup> soil) followed by PM (124.2mgkg<sup>-1</sup> soil) and DAP (99mgkg<sup>-1</sup> soil). Ammonia volatilization was reduced by approximately 70% with PL-BC and MS-BC. The decreased NH<inf>3</inf> volatilization with biochars is attributed to multiple mechanisms such as NH<inf>3</inf> adsorption/immobilization, and nitrification. Moreover, biochar increased wheat dry weight and N uptake as high as by 24.24% and 76.11%, respectively. This study unravels the immense potential of biochar in decreasing N volatilization from soils and simultaneously improving use efficiency by wheat.
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2014 |
Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of Pb(II) and Cr(III) by magnetite nanoparticles using various synthesis conditions', JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 20 3543-3549 (2014)
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2014 |
Du J, Chadalavada S, Chen Z, Naidu R, 'Environmental remediation techniques of tributyltin contamination in soil and water: A review', CHEMICAL ENGINEERING JOURNAL, 235 141-150 (2014)
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2014 |
Huang L, Weng X, Chen Z, Megharaj M, Naidu R, 'Synthesis of iron-based nanoparticles using oolong tea extract for the degradation of malachite green', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 117 801-804 (2014)
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2014 |
Huang L, Weng X, Chen Z, Megharaj M, Naidu R, 'Green synthesis of iron nanoparticles by various tea extracts: Comparative study of the reactivity', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 130 295-301 (2014)
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2014 |
Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Voltammetric Determination of Lead (II) and Cadmium (II) Using a Bismuth Film Electrode Modified with Mesoporous Silica Nanoparticles', Electrochimica Acta, 132 223-229 (2014) [C1]
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2014 |
Subashchandrabose SR, Krishnan K, Gratton E, Megharaj M, Naidu R, 'Potential of fluorescence imaging techniques to monitor mutagenic PAH uptake by microalga', Environmental Science and Technology, 48 9152-9160 (2014) [C1]
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2014 |
Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Anodic stripping voltammetric determination of traces of Pb(II) and Cd(II) using a glassy carbon electrode modified with bismuth nanoparticles', Microchimica Acta, 181 1199-1206 (2014) [C1]
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2014 |
Mayilswami S, Krishnan K, Megharaj M, Naidu R, 'Chronic PFOS exposure alters the expression of neuronal development-related human homologues in Eisenia fetida', Ecotoxicology and Environmental Safety, 110 288-297 (2014) [C1]
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2014 |
Wang L, Yang D, Chen Z, Lesniewski PJ, Naidu R, 'Application of neural networks with novel independent component analysis methodologies for the simultaneous determination of cadmium, copper, and lead using an ISE array', Journal of Chemometrics, 28 491-498 (2014) [C1]
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2014 |
Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Determination of Trace Lead and Cadmium in Water Samples by Anodic Stripping Voltammetry with a Nafion-Ionic Liquid-Coated Bismuth Film Electrode', Electroanalysis, 26 639-647 (2014) [C1]
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2014 |
Chen ZX, Cheng Y, Chen Z, Megharaj M, Naidu R, 'Kaolin-supported nanoscale zero-valent iron for removing cationic dye crystal violet in aqueous solution 189-196 (2014)
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2013 |
Lamb DT, Matanitobua VP, Palanisami T, Megharaj M, Naidu R, 'Bioavailability of Barium to Plants and Invertebrates in Soils Contaminated by Barite', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 47 4670-4676 (2013) [C1]
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2013 |
Sarkar B, Naidu R, Krishnamurti GSR, Megharaj M, 'Manganese(II)-Catalyzed and Clay-Minerals-Mediated Reduction of Chromium(VI) by Citrate', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 47 13629-13636 (2013) [C1]
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2013 |
Donner E, Brunetti G, Zarcinas B, Harris P, Tavakkoli E, Naidu R, Lombi E, 'Effects of Chemical Amendments on the Lability and Speciation of Metals in Anaerobically Digested Biosolids', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 47 11157-11165 (2013) [C1]
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2013 |
Liu Y, Naidu R, Ming H, 'Surface electrochemical properties of red mud (bauxite residue): Zeta potential and surface charge density', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 394 451-457 (2013) [C1]
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2013 |
Chen Z, Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Multifunctional kaolinite-supported nanoscale zero-valent iron used for the adsorption and degradation of crystal violet in aqueous solution', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 398 59-66 (2013) [C1]
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2013 |
Kuang Y, Wang Q, Chen Z, Megharaj M, Naidu R, 'Heterogeneous Fenton-like oxidation of monochlorobenzene using green synthesis of iron nanoparticles', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 410 67-73 (2013) [C1]
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2013 |
Rathnayake IVN, Megharaj M, Krishnamurti GSR, Bolan NS, Naidu R, 'Heavy metal toxicity to bacteria - Are the existing growth media accurate enough to determine heavy metal toxicity?', CHEMOSPHERE, 90 1195-1200 (2013) [C1]
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2013 |
Naidu R, Wong MH, 'Contaminants of emerging concern Foreword', SCIENCE OF THE TOTAL ENVIRONMENT, 463 1077-1078 (2013)
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2013 |
Pal R, Megharaj M, Kirkbride KP, Naidu R, 'Illicit drugs and the environment - A review', SCIENCE OF THE TOTAL ENVIRONMENT, 463 1079-1092 (2013)
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2013 |
Man M, Naidu R, Wong MH, 'Persistent toxic substances released from uncontrolled e-waste recycling and actions for the future', SCIENCE OF THE TOTAL ENVIRONMENT, 463 1133-1137 (2013) [C1]
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2013 |
Thangarajan R, Bolan NS, Tian G, Naidu R, Kunhikrishnan A, 'Role of organic amendment application on greenhouse gas emission from soil', SCIENCE OF THE TOTAL ENVIRONMENT, 465 72-96 (2013) [C1]
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2013 |
Bolan NS, Kunhikrishnan A, Naidu R, 'Carbon storage in a heavy clay soil landfill site after biosolid application', SCIENCE OF THE TOTAL ENVIRONMENT, 465 216-225 (2013) [C1]
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2013 |
Jeong J, Kim C, Lee K-S, Bolan NS, Naidu R, 'Carbon storage and soil CO2 efflux rates at varying degrees of damage from pine wilt disease in red pine stands', SCIENCE OF THE TOTAL ENVIRONMENT, 465 273-278 (2013) [C1]
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2013 |
Duan L, Naidu R, 'Effect of Ionic Strength and Index Cation on the Sorption of Phenanthrene', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Sarkar B, Naidu R, Megharaj M, 'Simultaneous Adsorption of Tri- and Hexavalent Chromium by Organoclay Mixtures', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Naidu R, 'Recent Advances in Contaminated Site Remediation', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Naidu R, Sreedaran BR, Smith E, 'Electroremediation of Lead-Contaminated Kaolinite using Cation Selective Membrane and Different Electrolyte Solutions', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Xie ZM, Chen J, Naidu R, 'Not All Phosphate Fertilizers Immobilize Lead in Soils', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Wang WH, Hoag GE, Collins JB, Naidu R, 'Evaluation of Surfactant-Enhanced In Situ Chemical Oxidation (S-ISCO) in Contaminated Soil', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Das P, Arias E VA, Kambala V, Mallavarapu M, Naidu R, 'Remediation of Perfluorooctane Sulfonate in Contaminated Soils by Modified Clay Adsorbent-a Risk-Based Approach', WATER AIR AND SOIL POLLUTION, 224 (2013) [C1]
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2013 |
Sudharshan S, Mallavarapu M, Bolan N, Naidu R, 'Effect of Seaweeds on Degradation of DDT in Soils', WATER AIR AND SOIL POLLUTION, 224 (2013) [C1]
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2013 |
Thangavadivel K, Wang WH, Birke V, Naidu R, 'A Comparative Study of Trichloroethylene (TCE) Degradation in Contaminated Groundwater (GW) and TCE-Spiked Deionised Water Using Zero Valent Iron (ZVI) Under Various Mass Transport Conditions', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Bahar MM, Megharaj M, Naidu R, 'Bioremediation of Arsenic-Contaminated Water: Recent Advances and Future Prospects', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Naidu R, Smith E, Wong MH, Megharaj M, Bolan N, Juhasz AL, Lombi E, 'Remediation of Site Contamination', WATER AIR AND SOIL POLLUTION, 224 (2013)
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2013 |
Bahar MM, Megharaj M, Naidu R, 'Bioremediation of arsenic-contaminated water: Recent advances and future prospects topical collection on remediation of site contamination', Water, Air, and Soil Pollution, 224 (2013)
Arsenic contamination of groundwater and surface water is widespread throughout the world. Considering its carcinogenicity and toxicity to human and animal health, remediation of ... [more]
Arsenic contamination of groundwater and surface water is widespread throughout the world. Considering its carcinogenicity and toxicity to human and animal health, remediation of arsenic-contaminated water has become a high priority. There are several physicochemical-based conventional technologies available for removing arsenic from water. However, these technologies possess a number of limitations such as high cost and generation of toxic by-products, etc. Therefore, research on new sustainable and cost-effective arsenic removal technologies for water has recently become an area of intense research activity. Bioremediation technology offers great potential for possible future application in decontamination of pollutants from the natural environment. It is not only environmentally friendly but cost-effective as well. This review focuses on the state-of-art knowledge of currently available arsenic remediation methods, their prospects, and recent advances with particular emphasis on bioremediation strategies. © 2013 Springer Science+Business Media Dordrecht.
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2013 |
Naidu R, 'Recent advances in contaminated site remediation topical collection on remediation of site contamination', Water, Air, and Soil Pollution, 224 (2013)
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2013 |
Wang WH, Hoag GE, Collins JB, Naidu R, 'Evaluation of surfactant-enhanced in situ chemical oxidation (S-ISCO) in contaminated soil topical collection on remediation of site contamination', Water, Air, and Soil Pollution, 224 (2013)
This work evaluated surfactant-enhanced in situ chemical oxidation (S-ISCO) in a hydrocarbon-contaminated soil. Surfactants and efficacy of oxidant activation as well as the treat... [more]
This work evaluated surfactant-enhanced in situ chemical oxidation (S-ISCO) in a hydrocarbon-contaminated soil. Surfactants and efficacy of oxidant activation as well as the treatability of contaminated soil were assessed. The surfactant VeruSOL-3 with a critical micelle concentration (CMC) of 5.5 g/L was selected. Based on the results, activated oxidations by sodium persulphate and hydrogen peroxide were able to effectively destroy target organic compounds in emulsion and soil. The destruction of total petroleum hydrocarbon (TPH) in emulsion was completed in 14 days and polycyclic aromatic hydrocarbons (PAHs) in excess of 96 %. Green nanoiron was much more active than other activators in emulsion. The data also indicates that oxidation using activators was much less pronounced in soil matrices. However, it is expected that given sufficient dose and treatment time, a higher destruction rate in the contaminated soil can be achieved. The study showed that the remediation of target organic contaminants (TPH, PAH) in soil by S-ISCO using activated sodium persulphate is feasible. © 2013 Springer Science+Business Media Dordrecht.
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2013 |
Duan L, Naidu R, 'Effect of ionic strength and index cation on the sorption of phenanthrene topical collection on remediation of site contamination', Water, Air, and Soil Pollution, 224 (2013)
Sorption characteristics of phenanthrene were studied in batch equilibrium experiments with 32 Australian soils that varied widely in physicochemical properties. Sorption of phena... [more]
Sorption characteristics of phenanthrene were studied in batch equilibrium experiments with 32 Australian soils that varied widely in physicochemical properties. Sorption of phenanthrene varied widely among the soils and was generally nonlinear, with the nonlinearity index (n) of the Freundlich isotherm varying from 0.62 to 1.01. Simple regression analyses revealed that total organic carbon (TOC) accounts for about 68 % of the variation in the partition coefficient (K' f ) for sorption among the soils at an equilibrium concentration (C e ) of 0.05 mg/L. The organic carbon normalized distribution coefficient (K OC ), varied considerably between soils with >70 % of the variance of logK OC being accounted for by logTOC, clay and log dissolved organic carbon (DOC). These results show that the phenanthrene C e is influenced by both TOC as well as the DOC in soil suspensions. The effects of ionic strength (IS) and index cation were investigated using four contrasting soils. Results show that with an increase in IS from 0.03 to 0.15 M sorption of phenanthrene generally increased in CaCl2 background solutions, whereas the effect was less significant and variable in NaCl background solutions. Sorption of phenanthrene was slightly higher at low IS (0.03 M) with Na+ as index cation compared with that of Ca2+, whereas an opposite trend was observed at higher IS (0.15 M). For two soils high in TOC, the flocculation of endogenous DOC in the presence of Ca2+ reduced the influence of background electrolyte and resulted in a more linear sorption isotherm as well as higher sorption capacity. This trend was more significant with Ca2+ relative to Na+. © 2013 Springer Science+Business Media Dordrecht.
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2013 |
Bolan NS, Makino T, Kunhikrishnan A, Kim P-J, Ishikawa S, Murakami M, et al., 'Cadmium Contamination and Its Risk Management in Rice Ecosystems', ADVANCES IN AGRONOMY, VOL 119, 119 183-273 (2013)
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2013 |
Seshadri B, Bolan NS, Naidu R, Wang H, Sajwan K, 'Clean Coal Technology Combustion Products: Properties, Agricultural and Environmental Applications, and Risk Management', ADVANCES IN AGRONOMY, VOL 119, 119 309-370 (2013) [C1]
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2013 |
Subashchandrabose SR, Ramakrishnan B, Megharaj M, Venkateswarlu K, Naidu R, 'Mixotrophic cyanobacteria and microalgae as distinctive biological agents for organic pollutant degradation', ENVIRONMENT INTERNATIONAL, 51 59-72 (2013)
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2013 |
Jiang C, Liu Y, Chen Z, Megharaj M, Naidu R, 'Impact of iron-based nanoparticles on microbial denitrification by Paracoccus sp. strain YF1', AQUATIC TOXICOLOGY, 142 329-335 (2013)
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2013 |
Lin H, Chen Z, Megharaj M, Naidu R, 'Biodegradation of TNT using Bacillus mycoides immobilized in PVA-sodium alginate-kaolin', APPLIED CLAY SCIENCE, 83-84 336-342 (2013)
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2013 |
Bolan NS, Choppala G, Kunhikrishnan A, Park J, Naidu R, 'Microbial Transformation of Trace Elements in Soils in Relation to Bioavailability and Remediation', REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 225, 225 1-56 (2013)
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2013 |
Lombi E, Donner E, Taheri S, Tavakkoli E, Jaemting AK, McClure S, et al., 'Transformation of four silver/silver chloride nanoparticles during anaerobic treatment of wastewater and post-processing of sewage sludge', ENVIRONMENTAL POLLUTION, 176 193-197 (2013) [C1]
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2013 |
Loganathan P, Vigneswaran S, Kandasamy J, Naidu R, 'Defluoridation of drinking water using adsorption processes', JOURNAL OF HAZARDOUS MATERIALS, 248 1-19 (2013)
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2013 |
Kiddee P, Naidu R, Wong MH, 'Metals and polybrominated diphenyl ethers leaching from electronic waste in simulated landfills', JOURNAL OF HAZARDOUS MATERIALS, 252 243-249 (2013) [C1]
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2013 |
Naidu R, Juhasz A, Mallavarapu M, Smith E, Lombi E, Bolan NS, et al., 'Chemical Bioavailability in the Terrestrial Environment - recent advances Preface', JOURNAL OF HAZARDOUS MATERIALS, 261 685-686 (2013)
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2013 |
Bolan N, Mahimairaja S, Kunhikrishnan A, Naidu R, 'Sorption-bioavailability nexus of arsenic and cadmium in variable-charge soils', JOURNAL OF HAZARDOUS MATERIALS, 261 725-732 (2013) [C1]
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2013 |
Kunhikrishnan A, Bolan NS, Naidu R, Kim W-I, 'Recycled water sources influence the bioavailability of copper to earthworms', JOURNAL OF HAZARDOUS MATERIALS, 261 784-792 (2013) [C1]
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2013 |
Sarkar B, Megharaj M, Shanmuganathan D, Naidu R, 'Toxicity of organoclays to microbial processes and earthworm survival in soils', JOURNAL OF HAZARDOUS MATERIALS, 261 793-800 (2013) [C1]
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2013 |
Seshadri B, Bolan N, Choppala G, Naidu R, 'Differential effect of coal combustion products on the bioavailability of phosphorus between inorganic and organic nutrient sources', JOURNAL OF HAZARDOUS MATERIALS, 261 817-825 (2013) [C1]
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2013 |
Harmsen J, Naidu R, 'Bioavailability as a tool in site management', JOURNAL OF HAZARDOUS MATERIALS, 261 840-846 (2013) [C1]
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2013 |
Wang T, Su J, Jin X, Chen Z, Megharaj M, Naidu R, 'Functional clay supported bimetallic nZVI/Pd nanoparticles used for removal of methyl orange from aqueous solution', JOURNAL OF HAZARDOUS MATERIALS, 262 819-825 (2013) [C1]
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2013 |
Bundschuh J, Bhattacharya P, Nath B, Naidu R, Ng J, Guilherme LRG, et al., 'Arsenic ecotoxicology: The interface between geosphere, hydrosphere and biosphere', JOURNAL OF HAZARDOUS MATERIALS, 262 883-886 (2013)
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2013 |
Bahar MM, Megharaj M, Naidu R, 'Kinetics of arsenite oxidation by Variovorax sp MM-1 isolated from a soil and identification of arsenite oxidase gene', JOURNAL OF HAZARDOUS MATERIALS, 262 997-1003 (2013) [C1]
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2013 |
Rahman MM, Asaduzzaman M, Naidu R, 'Consumption of arsenic and other elements from vegetables and drinking water from an arsenic-contaminated area of Bangladesh', JOURNAL OF HAZARDOUS MATERIALS, 262 1056-1063 (2013) [C1]
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2013 |
Bahar MM, Megharaj M, Naidu R, 'Toxicity, transformation and accumulation of inorganic arsenic species in a microalga Scenedesmus sp isolated from soil', JOURNAL OF APPLIED PHYCOLOGY, 25 913-917 (2013) [C1]
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2013 |
Prasad TNVKV, Kambala VSR, Naidu R, 'Phyconanotechnology: Synthesis of silver nanoparticles using brown marine algae Cystophora moniliformis and their characterisation', Journal of Applied Phycology, 25 177-182 (2013)
Biosynthesis of metallic nanoparticles is a relatively new developing area of nanotechnology which has economic and environmentally friendly advantages over conventional chemical ... [more]
Biosynthesis of metallic nanoparticles is a relatively new developing area of nanotechnology which has economic and environmentally friendly advantages over conventional chemical and physical methods of synthesis. In this paper, we report for the first time, on the synthesis of silver nanoparticles (AgNPs) using the Australasian brown marine algae Cystophora moniliformis. An extract of this alga was used as a reducing and stabilising agent. Temperature-dependent variation of the size of the AgNPs was observed. Agglomeration of the nanoparticles was observed at high temperatures. The average size of the AgNPs formed at temperatures < 65°C was 75 nm, whereas they were >2 µm at higher temperatures. The X-ray diffraction (XRD) pattern revealed face-centered cubic structure of the formed Ag nanoparticles. © 2012 Springer Science+Business Media B.V.
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2013 |
Weng X, Huang L, Chen Z, Megharaj M, Naidu R, 'Synthesis of iron-based nanoparticles by green tea extract and their degradation of malachite', INDUSTRIAL CROPS AND PRODUCTS, 51 342-347 (2013)
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2013 |
Shi L-N, Zhou Y, Chen Z, Megharaj M, Naidu R, 'Simultaneous adsorption and degradation of Zn2+ and Cu2+ from wastewaters using nanoscale zero-valent iron impregnated with clays', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 20 3639-3648 (2013)
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2013 |
Wong M-H, Noller B, Naidu R, Baumgartl T, 'Contaminated land, ecological assessment, and remediation conference series (CLEAR 2012): environmental pollution and risk assessments', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 20 8313-8315 (2013)
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2013 |
Naidu R, Channey R, McConnell S, Johnston N, Semple KT, McGrath S, et al., 'Towards bioavailability-based soil criteria: past, present and future perspectives', Environmental Science and Pollution Research, 1-7 (2013)
Bioavailability has been used as a key indicator in chemical risk assessment yet poorly quantified risk factor. Worldwide, the framework used to assess potentially contaminated si... [more]
Bioavailability has been used as a key indicator in chemical risk assessment yet poorly quantified risk factor. Worldwide, the framework used to assess potentially contaminated sites is similar, and the decisions are based on threshold contaminant concentration. The uncertainty in the definition and measurement of bioavailability had limited its application to environment risk assessment and remediation. Last ten years have seen major developments in bioavailability research and acceptance. The use of bioavailability in the decision making process as one of the key variables has led to a gradual shift towards a more sophisticated risk-based approach. Now a days, many decision makers and regulatory organisations 'more readily accept' this concept. Bioavailability should be the underlying basis for risk assessment and setting remediation goals of those contaminated sites that pose risk to environmental and human health. This paper summarises the potential application of contaminant bioavailability and bioaccessibility to the assessment of sites affected by different contaminants, and the potential for this to be the underlying basis for sustainable risk assessment and remediation in Europe, North America and Australia over the coming decade. © 2013 Springer-Verlag Berlin Heidelberg.
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2013 |
Ng JC, Juhasz A, Smith E, Naidu R, 'Assessing the bioavailability and bioaccessibility of metals and metalloids', Environmental Science and Pollution Research, 1-24 (2013)
Bioavailability (BA) determines the potential harm of a contaminant that exerts on the receptor. However, environmental guidelines for site contamination assessment are often set ... [more]
Bioavailability (BA) determines the potential harm of a contaminant that exerts on the receptor. However, environmental guidelines for site contamination assessment are often set assuming the contaminant is 100¿% bioavailable. This conservative approach to assessing site risk may result in the unnecessary and expensive remediation of a contaminated site. The National Environmental Protection Measures in Australia has undergone a statutory 5-year review that recommended that contaminant bioavailability and bioaccessibility (BAC) measures be adopted as part of the contaminated site risk assessment process by the National Environment Protection Council. We undertook a critical review of the current bioavailability and bioaccessibility approaches, methods and their respective limitations. The 'gold' standard to estimate the portion of a contaminant that reaches the system circulatory system (BA) of its receptor is to determine BA in an in vivo system. Various animal models have been utilised for this purpose. Because of animal ethics issues, and the expenses associated with performing in vivo studies, several in vitro methods have been developed to determine BAC as a surrogate model for the estimation of BA. However, few in vitro BAC studies have been calibrated against a reliable animal model, such as immature swine. In this review, we have identified suitable methods for assessing arsenic and lead BAC and proposed a decision tree for the determination of contaminant bioavailability and bioaccessibility for health risk assessment. © 2013 Springer-Verlag Berlin Heidelberg.
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2013 |
Sanderson P, Naidu R, Bolan N, 'Effectiveness of chemical amendments for stabilisation of lead and antimony in risk-based land management of soils of shooting ranges', Environmental Science and Pollution Research, 1-15 (2013)
This study aims to examine the effectiveness of amendments for risk-based land management of shooting range soils and to explore the effectiveness of amendments applied to sites w... [more]
This study aims to examine the effectiveness of amendments for risk-based land management of shooting range soils and to explore the effectiveness of amendments applied to sites with differing soil physiochemical parameters. A series of amendments with differing mechanisms for stabilisation were applied to four shooting range soils and aged for 1¿year. Chemical stabilisation was monitored by pore water extraction, toxicity characteristic leaching procedure (TCLP) and the physiologically based extraction test (PBET) over 1¿year. The performance of amendments when applied in conditions reflecting field application did not match the performance in the batch studies. Pore water-extractable metals were not greatly affected by amendment addition. TCLP-extractable Pb was reduced significantly by amendments, particularly lime and magnesium oxide. Antimony leaching was reduced by red mud but mobilised by some of the other amendments. Bioaccessible Pb measured by PBET shows that bioaccessible Pb increased with time after an initial decrease due to the presence of metallic fragments in the soil. Amendments were able to reduce bioaccessible Pb by up to 50¿%. Bioaccessible Sb was not readily reduced by soil amendments. Soil amendments were not equally effective across the four soils. © 2013 Her Majesty the Queen in Right of Australia.
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2013 |
Kiddee P, Naidu R, Wong MH, 'Electronic waste management approaches: An overview', WASTE MANAGEMENT, 33 1237-1250 (2013)
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2013 |
Bolan NS, Thangarajan R, Seshadri B, Jena U, Das KC, Wang H, Naidu R, 'Landfills as a biorefinery to produce biomass and capture biogas', BIORESOURCE TECHNOLOGY, 135 578-587 (2013)
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2013 |
Kuang Y, Zhou Y, Chen Z, Megharaj M, Naidu R, 'Impact of Fe and Ni/Fe nanoparticles on biodegradation of phenol by the strain Bacillus fusiformis (BFN) at various pH values', BIORESOURCE TECHNOLOGY, 136 588-594 (2013) [C1]
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2013 |
Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Investigation of Copper(II) Interference on the Anodic Stripping Voltammetry of Lead(II) and Cadmium(II) at Bismuth Film Electrode', ELECTROANALYSIS, 25 2637-2644 (2013) [C1]
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2013 |
Subashchandrabose SR, Megharaj M, Venkateswarlu K, Lockington R, Naidu R, 'Influence of nutrient mixtures on p-nitrophenol degradation by Stenotrophomonas sp isolated from groundwater', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 48 108-119 (2013)
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2013 |
Juhasz AL, Smith E, Weber J, Rees M, Kuchel T, Rofe A, et al., 'Predicting lead relative bioavailability in peri-urban contaminated soils using in vitro bioaccessibility assays', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 48 604-611 (2013)
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2013 |
Zhou Y, Kuang Y, Li W, Chen Z, Megharaj M, Naidu R, 'A combination of bentonite-supported bimetallic Fe/Pd nanoparticles and biodegradation for the remediation of p-chlorophenol in wastewater', CHEMICAL ENGINEERING JOURNAL, 223 68-75 (2013) [C1]
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2013 |
Liu X, Chen Z, Chen Z, Megharaj M, Naidu R, 'Remediation of Direct Black G in wastewater using kaolin-supported bimetallic Fe/Ni nanoparticles', CHEMICAL ENGINEERING JOURNAL, 223 764-771 (2013) [C1]
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2013 |
Tavakkoli E, Donner E, Juhasz A, Naidu R, Lombi E, 'A radio-isotopic dilution technique for functional characterisation of the associations between inorganic contaminants and water-dispersible naturally occurring soil colloids', ENVIRONMENTAL CHEMISTRY, 10 341-348 (2013) [C1]
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2013 |
Bekele DN, Naidu R, Bowman M, Chadalavada S, 'Vapor Intrusion Models for Petroleum and Chlorinated Volatile Organic Compounds: Opportunities for Future Improvements', VADOSE ZONE JOURNAL, 12 (2013) [C1]
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2013 |
Aryal R, Beecham S, Vigneswaran S, Kandasamy J, Naidu R, 'Spatial variation of polycyclic aromatic hydrocarbons and equivalent toxicity in Sydney Harbour, Australia', JOURNAL OF WATER AND CLIMATE CHANGE, 4 364-372 (2013)
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2012 |
Mohammed T, Aryal R, Vigneswaran S, Loganathan P, Kandasamy J, Naidu R, 'Removal of heavy metals in stormwater by hydrous ferric oxide', Proceedings of the Institution of Civil Engineers: Water Management, 165 171-178 (2012) [C1]
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2012 |
Lombi E, Donner E, Tavakkoli E, Turney TW, Naidu R, Miller BW, Scheckel KG, 'Fate of Zinc Oxide Nanoparticles during Anaerobic Digestion of Wastewater and Post-Treatment Processing of Sewage Sludge', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 46 9089-9096 (2012) [C1]
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2012 |
Lin Y, Chen Z, Megharaj M, Naidu R, 'Degradation of scarlet 4BS in aqueous solution using bimetallic Fe/Ni nanoparticles', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 381 30-35 (2012) [C1]
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2012 |
Choppala GK, Bolan NS, Megharaj M, Chen Z, Naidu R, 'The Influence of Biochar and Black Carbon on Reduction and Bioavailability of Chromate in Soils', JOURNAL OF ENVIRONMENTAL QUALITY, 41 1175-1184 (2012) [C1]
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2012 |
Sanderson P, Naidu R, Bolan N, Bowman M, Mclure S, 'Effect of soil type on distribution and bioaccessibility of metal contaminants in shooting range soils', SCIENCE OF THE TOTAL ENVIRONMENT, 438 452-462 (2012) [C1]
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2012 |
Lamb DT, Heading S, Bolan N, Naidu R, 'Use of Biosolids for Phytocapping of Landfill Soil', WATER AIR AND SOIL POLLUTION, 223 2695-2705 (2012) [C1]
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2012 |
Cheng Y, Lin H, Chen Z, Megharaj M, Naidu R, 'Biodegradation of crystal violet using Burkholderia vietnamiensis C09V immobilized on PVA-sodium alginate-kaolin gel beads', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 83 108-114 (2012)
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2012 |
Lamb DT, Naidu R, Ming H, Megharaja M, 'Copper phytotoxicity in native and agronomical plant species', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 85 23-29 (2012) [C1]
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2012 |
Thavamani P, Megharaj M, Naidu R, 'Multivariate analysis of mixed contaminants (PAHs and heavy metals) at manufactured gas plant site soils', ENVIRONMENTAL MONITORING AND ASSESSMENT, 184 3875-3885 (2012)
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2012 |
Donner E, Ryan CG, Howard DL, Zarcinas B, Scheckel KG, McGrath SP, et al., 'A multi-technique investigation of copper and zinc distribution, speciation and potential bioavailability in biosolids', ENVIRONMENTAL POLLUTION, 166 57-64 (2012) [C1]
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2012 |
Matheyarasu R, Seshadri B, Bolan N, Naidu R, 'Nutrient management in effluents derived from agricultural industries: An Australian perspective', WIT Transactions on Ecology and the Environment, (2012) [C1]
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2012 |
Thavamani P, Malik S, Beer M, Megharaj M, Naidu R, 'Microbial activity and diversity in long-term mixed contaminated soils with respect to polyaromatic hydrocarbons and heavy metals', JOURNAL OF ENVIRONMENTAL MANAGEMENT, 99 10-17 (2012)
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2012 |
Liu Y, Gan L, Chen Z, Megharaj M, Naidu R, 'Removal of nitrate using Paracoccus sp YF1 immobilized on bamboo carbon', JOURNAL OF HAZARDOUS MATERIALS, 229 419-425 (2012) [C1]
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2012 |
Pal R, Megharaj M, Naidu R, Klass G, Cox M, Kirkbride KP, 'Degradation in soil of precursors and by-products associated with the illicit manufacture of methylamphetamine: Implications for clandestine drug laboratory investigation', FORENSIC SCIENCE INTERNATIONAL, 220 245-250 (2012)
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2012 |
Subashchandrabose SR, Megharaj M, Venkateswarlu K, Naidu R, 'p-nitrophenol toxicity to and its removal by three select soil isolates of microalgae: The role of antioxidants', ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY, 31 1980-1988 (2012) [C1]
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2012 |
Singh BK, Naidu R, 'Cleaning contaminated environment: a growing challenge', BIODEGRADATION, 23 785-786 (2012)
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2012 |
Bahar MM, Megharaj M, Naidu R, 'Arsenic bioremediation potential of a new arsenite-oxidizing bacterium Stenotrophomonas sp MM-7 isolated from soil', BIODEGRADATION, 23 803-812 (2012)
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2012 |
Thavamani P, Megharaj M, Naidu R, 'Bioremediation of high molecular weight polyaromatic hydrocarbons co-contaminated with metals in liquid and soil slurries by metal tolerant PAHs degrading bacterial consortium', BIODEGRADATION, 23 823-835 (2012)
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2012 |
Sudharshan S, Naidu R, Mallavarapu M, Bolan N, 'DDT remediation in contaminated soils: a review of recent studies', BIODEGRADATION, 23 851-863 (2012)
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2012 |
Naidu R, Nandy S, Megharaj M, Kumar RP, Chadalavada S, Chen Z, Bowman M, 'Monitored natural attenuation of a long-term petroleum hydrocarbon contaminated sites: a case study', BIODEGRADATION, 23 881-895 (2012)
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2012 |
Ma C, Naidu R, Liu F, Lin C, Ming H, 'Influence of hybrid giant Napier grass on salt and nutrient distributions with depth in a saline soil', BIODEGRADATION, 23 907-916 (2012)
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2012 |
Sarkar B, Naidu R, Rahman MM, Megharaj M, Xi Y, 'Organoclays reduce arsenic bioavailability and bioaccessibility in contaminated soils', JOURNAL OF SOILS AND SEDIMENTS, 12 704-712 (2012)
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2012 |
Smith E, Weber J, Rofe A, Gancarz D, Naidu R, Juhasz AL, 'Assessment of DDT Relative Bioavailability and Bioaccessibility in Historically Contaminated Soils Using an in Vivo Mouse Model and Fed and Unfed Batch in Vitro Assays', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 46 2928-2934 (2012) [C1]
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2012 |
Pal R, Megharaj M, Kirkbride KP, Naidu R, 'Fate of 1-(1 ',4 '-cyclohexadienyl)-2-methylaminopropane (CMP) in soil: Route-specific by-product in the clandestine manufacture of methamphetamine', SCIENCE OF THE TOTAL ENVIRONMENT, 416 394-399 (2012) [C1]
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2012 |
Park JH, Bolan N, Megharaj M, Naidu R, 'Relative Value of Phosphate Compounds in Reducing the Bioavailability and Toxicity of Lead in Contaminated Soils', WATER AIR AND SOIL POLLUTION, 223 599-608 (2012)
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2012 |
Kunhikrishnan A, Bolan NS, Mueller K, Laurenson S, Naidu R, Kim W-I, 'THE INFLUENCE OF WASTEWATER IRRIGATION ON THE TRANSFORMATION AND BIOAVAILABILITY OF HEAVY METAL (LOID)S IN SOIL', ADVANCES IN AGRONOMY, VOL 115, 115 215-297 (2012)
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2012 |
Ming H, He W, Lamb DT, Megharaj M, Naidu R, 'Bioavailability of lead in contaminated soil depends on the nature of bioreceptor', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 78 344-350 (2012) [C1]
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2012 |
Murtaza G, Haynes RJ, Kim K-R, Zia MH, Naidu R, Belyaeva ON, 'Effect of aging biosolids with soils of contrasting pH on subsequent concentrations of Cu and Zn in pore water and on their plant uptake', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 19 636-645 (2012)
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2012 |
Zhou Y-F, Haynes RJ, Naidu R, 'Use of inorganic and organic wastes for in situ immobilisation of Pb and Zn in a contaminated alkaline soil', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 19 1260-1270 (2012)
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2012 |
Sreenivasulu C, Megharaj M, Venkateswarlu K, Naidu R, 'Degradation of p-nitrophenol by immobilized cells of Bacillus spp. isolated from soil', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, 68 24-27 (2012)
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2012 |
Sarkar B, Xi Y, Megharaj M, Krishnamurti GSR, Bowman M, Rose H, Naidu R, 'Bioreactive Organoclay: A New Technology for Environmental Remediation', CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 42 435-488 (2012)
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2012 |
Loganathan P, Vigneswaran S, Kandasamy J, Naidu R, 'Cadmium Sorption and Desorption in Soils: A Review', CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 42 489-533 (2012)
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2012 |
Sarkar B, Megharaj M, Xi Y, Naidu R, 'Surface charge characteristics of organo-palygorskites and adsorption of p-nitrophenol in flow-through reactor system', CHEMICAL ENGINEERING JOURNAL, 185 35-43 (2012) [C1]
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2012 |
Chen Z-X, Cheng Y, Chen Z, Megharaj M, Naidu R, 'Kaolin-supported nanoscale zero-valent iron for removing cationic dye-crystal violet in aqueous solution', JOURNAL OF NANOPARTICLE RESEARCH, 14 (2012) [C1]
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2012 |
Kim C, Jeong J, Bolan NS, Naidu R, 'Short-term effects of fertilizer application on soil respiration in red pine stands', Journal of Ecology and Field Biology, 35 307-311 (2012)
This study was conducted to evaluate the dynamics of soil respiration (total soil and heterotrophic respiration) following fertilizer application in red pine forests. Fertilizer (... [more]
This study was conducted to evaluate the dynamics of soil respiration (total soil and heterotrophic respiration) following fertilizer application in red pine forests. Fertilizer (N:P:K = 113:150:37 kg/ha), which reflects current practices in Korean forest, was applied in April 2011, and total soil and heterotrophic respiration rates were monitored from April 2011 to March 2012. Monthly variation of total soil and heterotrophic respiration rates were similar between the fertilizer and control treatments, as soil temperature was the dominant factor controlling the both rates. Total soil respiration rates during the study period were not significantly different between the fertilizer (0.504 g CO2 m-2 h-1) and control (0.501 g CO2 m-2 h-1) treatments. However, the proportion of heterotrophic respiration was higher in the fertilizer (78% of total soil respiration rates) than in the control (62% of total soil respiration rates) treatments. These results suggest that current fertilizer practices in Korea forest soil do not substantially affect total soil respiration rates. © The Ecological Society of Korea.
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2012 |
Sanderson P, Naidu R, Bolan N, Bowman M, 'Critical review on chemical stabilization of metal contaminants in shooting range soils', Journal of Hazardous, Toxic, and Radioactive Waste, 16 258-272 (2012)
Shooting ranges have come under increased scrutiny in recent years as a potential source of contamination owing to the high loading of lead in the soil. Stabilization by the addit... [more]
Shooting ranges have come under increased scrutiny in recent years as a potential source of contamination owing to the high loading of lead in the soil. Stabilization by the addition of chemical amendments has been examined as a viable risk-based approach to managing shooting range contamination. Amendments have been shown to immobilize metals to varying degrees, determined by the target contaminant, the amendment used, soil properties, and the reaction kinetics in the contaminated soil and amendment system. Field scale evaluation of the effectiveness of chemical amendments for the stabilization of metal contaminants in shooting range soil is limited. Doubt remains over effectiveness and long-term stability under the varying conditions found in the field, which affect the kinetics of immobilization and dissolution in amended soil. © 2012 American Society of Civil Engineers.
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2012 |
Chadalavada S, Datta B, Naidu R, 'Optimal Identification of Groundwater Pollution Sources Using Feedback Monitoring Information: A Case Study', Environmental Forensics, 13 140-153 (2012)
A feedback-based methodology has been developed for identifying the unknown pollution sources in groundwater-contaminated aquifers. The methodology consists of models within an it... [more]
A feedback-based methodology has been developed for identifying the unknown pollution sources in groundwater-contaminated aquifers. The methodology consists of models within an iterative feedback system, with the capacity of feeding back real-time measurements of pollutant concentrations for the sequential optimal designs and characterization of the contaminated aquifer study area. The resulting linked-simulation optimization model considers the delineation of the contaminant plume, optimally characterizing the site in terms of pollutant sources and the optimal monitoring network leading to the remediation and/or management of the contaminated aquifer. As part of the methodology, a simulation-optimization code was developed by linking a groundwater flow and transport model with an optimization code for the purpose of identifying the unknown pollution sources. The proposed methodology addresses the source identification process with very limited information available regarding the observed contamination data for the identification of unknown pollution sources. This methodology is applied to a chlorinated hydrocarbon contaminated site for the identification of unknown pollution sources. Information regarding the sources such as the magnitude, location and the duration of contamination activity were not known for the study area considered in this work except the information regarding the likely activities that led to its contamination. Developed methodology is applied to choose the optimal source locations from the identified potential locations. Depending on the availability of observed contaminant concentration values the domain for the methodology application is divided into three different management periods. The optimal source estimates obtained at the end of the third management period suggests that only one potential source location, S2, confirms to be the source and active. The qualitative assessment of the results also performed utilizing the contamination information obtained during the field investigations. The results demonstrate the practicability of the feedback-based methodology in identifying the unknown pollution sources in groundwater. © 2012 Copyright Taylor and Francis Group, LLC.
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2011 |
Megharaj M, Venkateswarlu K, Naidu R, 'Effects of Carbaryl and 1-Naphthol on Soil Population of Cyanobacteria and Microalgae and Select Cultures of Diazotrophic Cyanobacteria', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 87 324-329 (2011)
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2011 |
Sun Q, Chen Z, Yuan D, Yu C-P, Mallavarapu M, Naidu R, 'On-Line SPE Coupled with LC-APCI-MS for the Determination of Trace Explosives in Water', CHROMATOGRAPHIA, 73 631-637 (2011)
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2011 |
Su J, Lin S, Chen Z, Megharaj M, Naidu R, 'Dechlorination of p-chlorophenol from aqueous solution using bentonite supported Fe/Pd nanoparticles: Synthesis, characterization and kinetics', DESALINATION, 280 167-173 (2011)
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2011 |
Smith E, Kempson IM, Juhasz AL, Weber J, Rofe A, Gancarz D, et al., 'In Vivo-in Vitro and XANES Spectroscopy Assessments of Lead Bioavailability in Contaminated Periurban Solis', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 45 6145-6152 (2011) [C1]
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2011 |
Donner E, Howard DL, de Jonge MD, Paterson D, Cheah MH, Naidu R, Lombi E, 'X-ray Absorption and Micro X-ray Fluorescence Spectroscopy Investigation of Copper and Zinc Speciation in Biosolids', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 45 7249-7257 (2011) [C1]
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2011 |
Liu Y, Naidu R, Ming H, 'Red mud as an amendment for pollutants in solid and liquid phases', GEODERMA, 163 1-12 (2011)
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2011 |
Chen Z-X, Jin X-Y, Chen Z, Megharaj M, Naidu R, 'Removal of methyl orange from aqueous solution using bentonite-supported nanoscale zero-valent iron', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 363 601-607 (2011) [C1]
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2011 |
Shanmuganathan D, Megharaj M, Chen Z, Naidu R, 'Polybrominated diphenyl ethers (PBDEs) in marine foodstuffs in Australia: Residue levels and contamination status of PBDEs', MARINE POLLUTION BULLETIN, 63 154-159 (2011)
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2011 |
Kunhikrishnan A, Bolan NS, Naidu R, 'Phytoavailability of copper in the presence of recycled water sources', PLANT AND SOIL, 348 425-438 (2011) [C1]
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2011 |
Zhang X, Lin S, Chen Z, Megharaj M, Naidu R, 'Kaolinite-supported nanoscale zero-valent iron for removal of Pb2+ from aqueous solution: Reactivity, characterization and mechanism', WATER RESEARCH, 45 3481-3488 (2011) [C1]
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2011 |
Pal R, Megharaj M, Kirkbride KP, Heinrich T, Naidu R, 'Biotic and abiotic degradation of illicit drugs, their precursor, and by-products in soil', CHEMOSPHERE, 85 1002-1009 (2011) [C1]
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2011 |
Park JH, Bolan N, Megharaj M, Naidu R, 'Comparative value of phosphate sources on the immobilization of lead, and leaching of lead and phosphorus in lead contaminated soils', SCIENCE OF THE TOTAL ENVIRONMENT, 409 853-860 (2011) [C1]
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2011 |
Thangavadivel K, Megharaj M, Smart RSC, Lesniewski PJ, Bates D, Naidu R, 'Ultrasonic Enhanced Desorption of DDT from Contaminated Soils', WATER AIR AND SOIL POLLUTION, 217 115-125 (2011)
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2011 |
Murtaza G, Haynes RJ, Naidu R, Belyaeva ON, Kim K-R, Lamb DT, Bolan NS, 'Natural Attenuation of Zn, Cu, Pb and Cd in Three Biosolids-Amended Soils of Contrasting pH Measured Using Rhizon Pore Water Samplers', WATER AIR AND SOIL POLLUTION, 221 351-363 (2011) [C1]
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2011 |
Thavamani P, Megharaj M, Krishnamurti GSR, McFarland R, Naidu R, 'Finger printing of mixed contaminants from former manufactured gas plant (MGP) site soils: Implications to bioremediation', ENVIRONMENT INTERNATIONAL, 37 184-189 (2011) [C1]
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2011 |
Megharaj M, Ramakrishnan B, Venkateswarlu K, Sethunathan N, Naidu R, 'Bioremediation approaches for organic pollutants: A critical perspective', ENVIRONMENT INTERNATIONAL, 37 1362-1375 (2011)
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2011 |
Chadalavada S, Datta B, Naidu R, 'Uncertainty based optimal monitoring network design for a chlorinated hydrocarbon contaminated site', ENVIRONMENTAL MONITORING AND ASSESSMENT, 173 929-940 (2011)
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2011 |
Sarkar B, Xi Y, Megharaj M, Naidu R, 'Orange II adsorption on palygorskites modified with alkyl trimethylammonium and dialkyl dimethylammonium bromide - An isothermal and kinetic study', APPLIED CLAY SCIENCE, 51 370-374 (2011)
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2011 |
Xi Y, Megharaj M, Naidu R, 'Dispersion of zerovalent iron nanoparticles onto bentonites and use of these catalysts for orange II decolourisation', APPLIED CLAY SCIENCE, 53 716-722 (2011)
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2011 |
Ramakrishnan B, Megharaj M, Venkateswarlu K, Sethunathan N, Naidu R, 'Mixtures of Environmental Pollutants: Effects on Microorganisms and Their Activities in Soils', REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 211, 211 63-120 (2011)
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2011 |
Aryal R, Baral B, Vigneswaran S, Naidu R, Loganathan P, 'Seasonal influence on urban dust PAH profile and toxicity in Sydney, Australia', WATER SCIENCE AND TECHNOLOGY, 63 2238-2243 (2011)
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2011 |
Park JH, Bolan N, Megharaj M, Naidu R, 'Concomitant rock phosphate dissolution and lead immobilization by phosphate solubilizing bacteria (Enterobacter sp.)', JOURNAL OF ENVIRONMENTAL MANAGEMENT, 92 1115-1120 (2011)
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2011 |
Park JH, Bolan N, Megharaj M, Naidu R, 'Isolation of phosphate solubilizing bacteria and their potential for lead immobilization in soil', JOURNAL OF HAZARDOUS MATERIALS, 185 829-836 (2011) [C1]
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2011 |
Smith E, Weber J, Naidu R, McLaren RG, Juhasz AL, 'Assessment of lead bioaccessibility in peri-urban contaminated soils', JOURNAL OF HAZARDOUS MATERIALS, 186 300-305 (2011) [C1]
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2011 |
Sarkar B, Megharaj M, Xi Y, Naidu R, 'Structural characterisation of Arquad (R) 2HT-75 organobentonites: Surface charge characteristics and environmental application', JOURNAL OF HAZARDOUS MATERIALS, 195 155-161 (2011) [C1]
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2011 |
Subashchandrabose SR, Ramakrishnan B, Megharaj M, Venkateswarlu K, Naidu R, 'Consortia of cyanobacteria/microalgae and bacteria: Biotechnological potential', BIOTECHNOLOGY ADVANCES, 29 896-907 (2011)
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2011 |
Caceres TP, Megharaj M, Naidu R, 'Toxicity and transformation of insecticide fenamiphos to the earthworm Eisenia fetida', ECOTOXICOLOGY, 20 20-28 (2011)
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2011 |
Aryal R, Kandasamy J, Vigneswaran S, Naidu R, Lee SH, 'Review of stormwater quality, quantity and treatment methods part 1: Stormwater quantity modelling', Environmental Engineering Research, 16 71-78 (2011)
A review of stormwater quantity and quality in the urban environment is presented. The review is presented in three parts. The first part reviews the mathematical methods for stor... [more]
A review of stormwater quantity and quality in the urban environment is presented. The review is presented in three parts. The first part reviews the mathematical methods for stormwater quantity and has been undertaken by examining a number of stormwater models that are in current use. The important feature of models, their applications, and management has been discussed. Different types of stormwater management models are presented in the literatures. Generally, all the models are simplified as conceptual or empirical depending on whether the model is based on physical laws or not. In both cases if any of the variables in the model are regarded as random variables having a probability distribution, then the model is stochastic model. Otherwise the model is deterministic (based on process descriptions). The analytical techniques are presented in this paper.
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2011 |
Aryal R, Kandasamy J, Vigneswaran S, Naidu R, Lee HS, 'Review of stormwater quality, quantity and treatment methods part 2: Stormwater: Quality modelling', Environmental Engineering Research, 16 143-149 (2011)
In this paper, review of stormwater quality and quantity in the urban environment is presented. The review is presented in three parts. This second part reviews the mathematical t... [more]
In this paper, review of stormwater quality and quantity in the urban environment is presented. The review is presented in three parts. This second part reviews the mathematical techiques used in the stromwater quality modelling and has been undertaken by examining a number of models that are in current use. The important features of models are discussed.
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2011 |
Park JH, Bolan NS, Chung JW, Naidu R, Megharaj M, 'Environmental monitoring of the role of phosphate compounds in enhancing immobilization and reducing bioavailability of lead in contaminated soils', JOURNAL OF ENVIRONMENTAL MONITORING, 13 2234-2242 (2011)
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2011 |
Haynes RJ, Zhou YF, Naidu R, 'Recycling and use of wastes/co-products from the iron/steel and alumina industries', International Journal of Environment and Waste Management, 8 174-211 (2011)
The current and potential uses for Blast Furnace (BF) slag, steel slag and red mud, and their environmental implications, are outlined and discussed as are the difficulties associ... [more]
The current and potential uses for Blast Furnace (BF) slag, steel slag and red mud, and their environmental implications, are outlined and discussed as are the difficulties associated with red mud disposal and subsequent rehabilitation of the disposal sites. Whilst practicable bulk uses for the large amounts of slags that are produced have been found, the uses for red mud are limited and only utilise an extremely small proportion of the waste. Strategies to reduce the cost of red mud disposal are addressed and it is concluded that, as is already the case for slags, bulk uses for red mud need to be developed. Copyright © 2011 Inderscience Enterprises Ltd.
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2011 |
Chadalavada S, Datta B, Naidu R, 'Optimisation approach for pollution source identification in groundwater: An overview', International Journal of Environment and Waste Management, 8 40-61 (2011)
Groundwater pollution occurs from different anthropogenic sources like leakage from Underground Storage Tanks (USTs) and depositories, leakage from hazardous waste dump sites and ... [more]
Groundwater pollution occurs from different anthropogenic sources like leakage from Underground Storage Tanks (USTs) and depositories, leakage from hazardous waste dump sites and soak pits. Remediation of these contaminated sites requires optimal decision-making system so that the remediation is done in a cost-effective and efficient manner. Identification of unknown pollution sources plays an important role in remediation and containment of contaminant plume in a hazardous site. This paper reviews different optimisation algorithms like classical, nonclassical such as Genetic Algorithm, Artificial Neural Network and Simulated Annealing and hybrid methods, which can be applied for optimal identification of unknown groundwater pollution sources. Copyright © 2011 Inderscience Enterprises Ltd.
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2011 |
Prasad TNVKV, Kambala VSR, Naidu R, 'A Critical Review on Biogenic Silver Nanoparticles and their Antimicrobial Activity', CURRENT NANOSCIENCE, 7 531-544 (2011)
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2011 |
Rahman MM, Asaduzzaman M, Naidu R, 'Arsenic Exposure from Rice and Water Sources in the Noakhali District of Bangladesh', WATER QUALITY EXPOSURE AND HEALTH, 3 1-10 (2011)
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2010 |
Wang W, Chen Z, Davey DE, Naidu R, 'SPECIATION OF SELENIUM IN BIOLOGICAL SAMPLES BY ION CHROMATOGRAPHY WITH INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 33 1151-1173 (2010)
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2010 |
Juhasz AL, Weber J, Naidu R, Gancarz D, Rofe A, Todor D, Smith E, 'Determination of Cadmium Relative Bioavailability in Contaminated Soils and Its Prediction Using in Vitro Methodologies', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 44 5240-5247 (2010)
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2010 |
Kim K-R, Owens G, Naidu R, Kwon S-I, 'Influence of plant roots on rhizosphere soil solution composition of long-term contaminated soils', GEODERMA, 155 86-92 (2010)
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2010 |
Sarkar B, Xi Y, Megharaj M, Krishnamurti GSR, Naidu R, 'Synthesis and characterisation of novel organopalygorskites for removal of p-nitrophenol from aqueous solution: Isothermal studies', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 350 295-304 (2010)
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2010 |
Xi Y, Mallavarapu M, Naidu R, 'Reduction and adsorption of Pb2+ in aqueous solution by nano-zero-valent iron-A SEM, TEM and XPS study', MATERIALS RESEARCH BULLETIN, 45 1361-1367 (2010)
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2010 |
Sun Q, Yuan D, Chen Z, Megharaj M, Naidu R, 'Reduction of polyatomic interferences during ion-chromatographic speciation of metal ions via their EDTA complexes along with ICP-MS detection using an octopole reaction system', MICROCHIMICA ACTA, 169 41-47 (2010)
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2010 |
Patra RC, Malik S, Beer M, Megharaj M, Naidu R, 'Molecular characterization of chromium (VI) reducing potential in Gram positive bacteria isolated from contaminated sites', SOIL BIOLOGY & BIOCHEMISTRY, 42 1857-1863 (2010)
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2010 |
Lamb DT, Ming H, Megharaj M, Naidu R, 'Phytotoxicity and Accumulation of Lead in Australian Native Vegetation', ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 58 613-621 (2010)
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2010 |
Lamb DT, Ming H, Megharaj M, Naidu R, 'Relative Tolerance of a Range of Australian Native Plant Species and Lettuce to Copper, Zinc, Cadmium, and Lead', ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 59 424-432 (2010)
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2010 |
Xi Y, Mallavarapu M, Naidu R, 'Preparation, characterization of surfactants modified clay minerals and nitrate adsorption', APPLIED CLAY SCIENCE, 48 92-96 (2010)
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2010 |
Xi Y, Mallavarapu M, Naidu R, 'Adsorption of the herbicide 2,4-D on organo-palygorskite', APPLIED CLAY SCIENCE, 49 255-261 (2010)
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2010 |
Aryal R, Vigneswaran S, Kandasamy J, Naidu R, 'Urban stormwater quality and treatment', KOREAN JOURNAL OF CHEMICAL ENGINEERING, 27 1343-1359 (2010)
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2010 |
Sarkar B, Xi Y, Megharaj M, Krishnamurti GSR, Rajarathnam D, Naidu R, 'Remediation of hexavalent chromium through adsorption by bentonite based Arquad (R) 2HT-75 organoclays', JOURNAL OF HAZARDOUS MATERIALS, 183 87-97 (2010)
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2010 |
Sarkar B, Megharaj M, Xi Y, Krishnamurti GSR, Naidu R, 'Sorption of quaternary ammonium compounds in soils: Implications to the soil microbial activities', JOURNAL OF HAZARDOUS MATERIALS, 184 448-456 (2010)
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2010 |
Seshadri B, Bolan NS, Naidu R, Brodie K, 'THE ROLE OF COAL COMBUSTION PRODUCTS IN MANAGING THE BIOAVAILABILITY OF NUTRIENTS AND HEAVY METALS IN SOILS', JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION, 10 378-398 (2010)
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2010 |
Okour Y, Shon HK, El Saliby IJ, Naidu R, Kim JB, Kim J-H, 'Preparation and characterisation of titanium dioxide (TiO2) and thiourea-doped titanate nanotubes prepared from wastewater flocculated sludge', BIORESOURCE TECHNOLOGY, 101 1453-1458 (2010)
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2010 |
Kim KR, Owens G, Naidu R, 'Effect of Root-Induced Chemical Changes on Dynamics and Plant Uptake of Heavy Metals in Rhizosphere Soils', PEDOSPHERE, 20 494-504 (2010)
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2010 |
Ramakrishnan B, Megharaj M, Venkateswarlu K, Naidu R, Sethunathan N, 'The Impacts of Environmental Pollutants on Microalgae and Cyanobacteria', CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 40 699-821 (2010)
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2010 |
Thangavadivel K, Megharaj M, Smart RSC, Lesniewski PJ, Naidu R, 'Sonochemical destruction of chloroform by using low frequency ultrasound in batch and flow cell', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 45 483-489 (2010)
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2009 |
Khan NI, Owens G, Bruce D, Naidu R, 'An effective dietary survey framework for the assessment of total dietary arsenic intake in Bangladesh: Part-A-FFQ design', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 207-220 (2009)
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2009 |
Kim K-R, Owens G, Naidu R, 'Heavy metal distribution, bioaccessibility, and phytoavailability in long-term contaminated soils from Lake Macquarie, Australia', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 47 166-176 (2009)
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2009 |
Juhasz AL, Weber J, Smith E, Naidu R, Marschner B, Rees M, et al., 'Evaluation of SBRC-Gastric and SBRC-Intestinal Methods for the Prediction of In Vivo Relative Lead Bioavailability in Contaminated Soils', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 43 4503-4509 (2009)
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2009 |
Juhasz AL, Weber J, Smith E, Naidu R, Rees M, Rofe A, et al., 'Assessment of Four Commonly Employed in Vitro Arsenic Bioaccessibility Assays for Predicting in Vivo Relative Arsenic Bioavailability in Contaminated Soils', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 43 9487-9494 (2009)
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2009 |
Wang W, Chen Z, Davey DE, Naidu R, 'Extraction of selenium species in pharmaceutical tablets using enzymatic and chemical methods', MICROCHIMICA ACTA, 165 167-172 (2009)
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2009 |
Damayanti TA, Naidu RA, 'Identification of Peanut bud necrosis virus and Tomato spotted wilt virus in Indonesia for the first time', PLANT PATHOLOGY, 58 782-782 (2009)
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2009 |
Chen Z, He W, Beer M, Megharaj M, Naidu R, 'Speciation of glyphosate, phosphate and aminomethylphosphonic acid in soil extracts by ion chromatography with inductively coupled plasma mass spectrometry with an octopole reaction system', TALANTA, 78 852-856 (2009)
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2009 |
Basu NB, Suresh P, Rao C, Poyer IC, Nandy S, Mallavarapu M, et al., 'Integration of traditional and innovative characterization techniques for flux-based assessment of Dense Non-aqueous Phase Liquid (DNAPL) sites', JOURNAL OF CONTAMINANT HYDROLOGY, 105 161-172 (2009)
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2009 |
Naidu R, Bhattacharya P, 'Arsenic in the environment-risks and management strategies', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 1-8 (2009)
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2009 |
Rahman MM, Naidu R, Bhattacharya P, 'Arsenic contamination in groundwater in the Southeast Asia region', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 9-21 (2009)
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2009 |
Bhattacharya P, Hasan MA, Sracek O, Smith E, Ahmed KM, von Bromssen M, et al., 'Groundwater chemistry and arsenic mobilization in the Holocene flood plains in south-central Bangladesh', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 23-43 (2009)
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2009 |
Arora M, Megharaj M, Naidu R, 'Arsenic testing field kits: some considerations and recommendations', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 45-48 (2009)
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2009 |
Smith E, Naidu R, 'Chemistry of inorganic arsenic in soils: kinetics of arsenic adsorption-desorption', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 49-59 (2009)
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2009 |
Naidu R, Smith E, Huq SMI, Owens G, 'Sorption and bioavailability of arsenic in selected Bangladesh soils', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 61-68 (2009)
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2009 |
Rahman MM, Chen Z, Naidu R, 'Extraction of arsenic species in soils using microwave-assisted extraction detected by ion chromatography coupled to inductively coupled plasma mass spectrometry', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 93-102 (2009)
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2009 |
Rahman F, Chen Z, Naidu R, 'A comparative study of the extractability of arsenic species from silverbeet and amaranth vegetables', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 103-113 (2009)
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2009 |
Rahman F, Naidu R, 'The influence of arsenic speciation (As-III & As-v) and concentration on the growth, uptake and translocation of arsenic in vegetable crops (silverbeet and amaranth): greenhouse study', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 115-124 (2009)
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2009 |
He W, Megharaj M, Naidu R, 'Toxicity of tri- and penta-valent arsenic, alone and in combination, to the cladoceran Daphnia carinata: the influence of microbial transformation in natural waters', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 133-141 (2009)
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2009 |
Khan NI, Owens G, Bruce D, Naidu R, 'Human arsenic exposure and risk assessment at the landscape level: a review', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 143-166 (2009)
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2009 |
Rees M, Sansom L, Rofe A, Juhasz AL, Smith E, Weber J, et al., 'Principles and application of an in vivo swine assay for the determination of arsenic bioavailability in contaminated matrices', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 167-177 (2009)
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2009 |
Rahman MM, Owens G, Naidu R, 'Arsenic levels in rice grain and assessment of daily dietary intake of arsenic from rice in arsenic-contaminated regions of Bangladesh-implications to groundwater irrigation', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 179-187 (2009)
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2009 |
Rahman MM, Ng JC, Naidu R, 'Chronic exposure of arsenic via drinking water and its adverse health impacts on humans', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 189-200 (2009)
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2009 |
Rahman MM, Rahman F, Sansom L, Naidu R, Schmidt O, 'Arsenic interactions with lipid particles containing iron', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 201-206 (2009)
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2009 |
Khan NI, Bruce D, Naidu R, Owens G, 'Implementation of food frequency questionnaire for the assessment of total dietary arsenic intake in Bangladesh: Part B, preliminary findings', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 221-238 (2009)
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2009 |
Thangavadivel K, Megharaj M, Smart RSC, Lesniewski PJ, Naidu R, 'Application of high frequency ultrasound in the destruction of DDT in contaminated sand and water', JOURNAL OF HAZARDOUS MATERIALS, 168 1380-1386 (2009)
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2009 |
Lamba DT, Ming H, Megharaj M, Naidu R, 'Heavy metal (Cu, Zn, Cd and Pb) partitioning and bioaccessibility in uncontaminated and long-term contaminated soils', JOURNAL OF HAZARDOUS MATERIALS, 171 1150-1158 (2009)
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2009 |
Caceres TP, He W, Megharaj M, Naidu R, 'Effect of insecticide fenamiphos on soil microbial activities in Australian and Ecuadorean soils', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 44 13-17 (2009)
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2009 |
Han F, Kambala VSR, Srinivasan M, Rajarathnam D, Naidu R, 'Tailored titanium dioxide photocatalysts for the degradation of organic dyes in wastewater treatment: A review', APPLIED CATALYSIS A-GENERAL, 359 25-40 (2009)
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2009 |
Chen Z, Owen G, Megharaj M, Naidu R, 'Speciation of Zn-aminopolycarboxylic complexes by electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry', RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 23 419-424 (2009)
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2009 |
Sun Q, Chen Z, Yuan D, Megharaj M, Naidu R, 'On-line solid-phase extraction coupled with liquid chromatography/electrospray ionization mass spectrometry for the determination of trace tributyltin and triphenyltin in water samples', RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 23 3795-3802 (2009)
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2009 |
Caceres TP, Megharaj M, Malik S, Beer M, Naidu R, 'Hydrolysis of fenamiphos and its toxic oxidation products by Microbacterium sp in pure culture and groundwater', BIORESOURCE TECHNOLOGY, 100 2732-2736 (2009)
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2009 |
Guo Z, Megharaj M, Beer M, Ming H, Rahman MM, Wu W, Naidu R, 'Heavy metal impact on bacterial biomass based on DNA analyses and uptake by wild plants in the abandoned copper mine soils', BIORESOURCE TECHNOLOGY, 100 3831-3836 (2009)
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2009 |
Kambala VSR, Naidu R, 'Disinfection Studies on TiO2 Thin Films Prepared by a Sol-Gel Method', JOURNAL OF BIOMEDICAL NANOTECHNOLOGY, 5 121-129 (2009)
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2008 |
Chen Z, Kim K-R, Owens G, Naidu R, 'Determination of carboxylic acids from plant root exudates by ion exclusion chromatography with ESI-MS', CHROMATOGRAPHIA, 67 113-117 (2008)
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2008 |
Chen Z, Akter KF, Rahman MM, Naidu R, 'The separation of arsenic species in soils and plant tissues by anion-exchange chromatography with inductively coupled mass spectrometry using various mobile phases', MICROCHEMICAL JOURNAL, 89 20-28 (2008)
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2008 |
Smith E, Naidu R, Weber J, Juhasz AL, 'The impact of sequestration on the bioaccessibility of arsenic in long-term contaminated soils', CHEMOSPHERE, 71 773-780 (2008)
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2008 |
Juhasz AL, Smith E, Weber J, Rees M, Rofe A, Kuchel T, et al., 'Application of an in vivo swine model for the determination of arsenic bioavailability in contaminated vegetables', CHEMOSPHERE, 71 1963-1969 (2008)
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2008 |
Juhasz AL, Smith E, Weber J, Naidu R, Rees M, Rofe A, et al., 'Effect of soil ageing on in vivo arsenic bioavailability in two dissimilar soils', CHEMOSPHERE, 71 2180-2186 (2008)
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2008 |
Smith E, Juhasz AL, Weber J, Naidu R, 'Arsenic uptake and speciation in rice plants grown under greenhouse conditions with arsenic contaminated irrigation water', SCIENCE OF THE TOTAL ENVIRONMENT, 392 277-283 (2008)
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2008 |
Caceres T, Megharaj M, Naidu R, 'Toxicity and transformation of fenamiphos and its metabolites by two micro algae Pseudokirchneiriella subcapitata and Chlorococcum sp.', SCIENCE OF THE TOTAL ENVIRONMENT, 398 53-59 (2008)
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2008 |
Malik S, Beer M, Megharaj M, Naidu R, 'The use of molecular techniques to characterize the microbial communities in contaminated soil and water', ENVIRONMENT INTERNATIONAL, 34 265-276 (2008)
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2008 |
Caceres TP, Megharaj M, Naidu R, 'Biodegradation of the Pesticide Fenamiphos by Ten Different Species of Green Algae and Cyanobacteria', CURRENT MICROBIOLOGY, 57 643-646 (2008)
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2008 |
Caceres TC, Megharaj M, Naidu R, 'Degradation of fenamiphos in soils collected from different geographical regions: The influence of soil properties and climatic conditions', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 43 314-322 (2008)
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2008 |
Caceres TP, Megharaj M, Naidu R, 'Sorption of fenamiphos to different soils: The influence of soil properties', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 43 605-610 (2008)
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2008 |
Chen Z, Wang W, Mallavarapu M, Naidu R, 'Comparison of no gas and He/H-2 cell modes used for reduction of isobaric interferences in selenium speciation by ion chromatography with inductively coupled plasma mass spectrometry', SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 63 69-75 (2008)
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2008 |
Thiruverikatachari R, Vigneswaran S, Naidu R, 'Permeable reactive barrier for groundwater remediation', JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 14 145-156 (2008)
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2007 |
Chen Z, Owens G, Naidu R, 'Confirmation of vanadium complex formation using electrospray mass spectrometry and determination of vanadium speciation by sample stacking capillary electrophoresis', ANALYTICA CHIMICA ACTA, 585 32-37 (2007)
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2007 |
Chen Z, Owens G, Kim K-R, Naidu R, 'Confirmation of lead aminocarboxylic complex formation using electrospray ionization mass spectrometry and speciation by anion-exchange chromatography coupled with ICP-MS', ANALYTICA CHIMICA ACTA, 599 163-169 (2007)
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2007 |
Chen ZL, Megharaj M, Naidu R, 'Determination of bromate and bromide in seawater by ion chromatography, with an ammonium salt solution as mobile phase, and inductively coupled plasma mass spectrometry', CHROMATOGRAPHIA, 65 115-118 (2007)
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2007 |
Chen Z, Khan NI, Owens G, Naidu R, 'Elimination of chloride interference on arsenic speciation in ion chromatography inductively coupled mass spectrometry using an octopole collision/reaction system', MICROCHEMICAL JOURNAL, 87 87-90 (2007)
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2007 |
Chen Z, Megharaj M, Naidu R, 'Speciation of chromium in waste water using ion chromatography inductively coupled plasma mass spectrometry', TALANTA, 72 394-400 (2007)
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2007 |
Chen Z, Megharaj M, Naidu R, 'Speciation of iodate and iodide in seawater by non-suppressed ion chromatography with inductively coupled plasma mass spectrometry', TALANTA, 72 1842-1846 (2007)
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2007 |
Chen Z, Megharaj M, Naidu R, 'Removal of interferences in the speciation of chromium using an octopole reaction system in ion chromatography with inductively coupled plasma mass spectrometry', TALANTA, 73 948-952 (2007)
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2007 |
Caceres T, He W, Naidu R, Meharaj M, 'Toxicity of chlorpyrifos and TCP alone and in combination to Daphnia carinata: The influence of microbial degradation in natural water', WATER RESEARCH, 41 4497-4503 (2007)
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2007 |
Caceres T, Megharaj M, Naidu R, 'Toxicity of fenamiphos and its metabolites to the cladoceran Daphnia carinata: The influence of microbial degradation in natural waters', CHEMOSPHERE, 66 1264-1269 (2007)
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2007 |
Juhasz AL, Smith E, Weber J, Rees M, Rofe A, Kuchel T, et al., 'In vitro assessment of arsenic bioaccessibility in contaminated (anthropogenic and geogenic) soils', CHEMOSPHERE, 69 69-78 (2007)
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2007 |
Juhasz AL, Smith E, Weber J, Rees M, Rofe A, Kuchel T, et al., 'Comparison of in vivo and in vitro methodologies for the assessment of arsenic bioavailability in contaminated soils', CHEMOSPHERE, 69 961-966 (2007)
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2007 |
Juhasz AL, Naidu R, 'Explosives: Fate, dynamics, and ecological impact in terrestrial and marine environments', REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 191, 191 163-215 (2007)
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2007 |
Chen Z, Rahman MM, Naidu R, 'Speciation of vanadium by anion-exchange chromatography with inductively coupled plasma mass spectrometry and con. rmation of vanadium complex formation using electrospray mass spectrometry', JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, 22 811-816 (2007)
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2007 |
Kim K-W, Naidu R, 'KoSSGE 10th Anniversary International Symposium on Soil and Groundwater Environment - Preface', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 29 257-258 (2007)
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2007 |
Chen Z, Megharaj M, Naidu R, 'Confirmation of iron complex formation using electrospray ionization mass spectrometry (ESI-MS) and sample stacking for analysis of iron polycarboxylate speciation by capillary electrophoresis', MICROCHEMICAL JOURNAL, 86 94-101 (2007)
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2006 |
Smith E, Smith J, Naidu R, 'Distribution and nature of arsenic along former railway corridors of South Australia', SCIENCE OF THE TOTAL ENVIRONMENT, 363 175-182 (2006)
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2006 |
Juhasz AL, Smith E, Weber J, Rees M, Rofe A, Kuchel T, et al., 'In vivo assessment of arsenic bioavailability in rice and its significance for human health risk assessment', ENVIRONMENTAL HEALTH PERSPECTIVES, 114 1826-1831 (2006)
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2006 |
Sun Y, Xie ZM, Li J, Xu JM, Chen ZL, Naidu R, 'Assessment of toxicity of heavy metal contaminated soils by the toxicity characteristic leaching procedure', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 28 73-78 (2006)
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2006 |
Ying Z, Naidu R, Crawford CR, 'Dual energy computed tomography for explosive detection', JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY, 14 235-256 (2006)
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2006 |
Huq SMI, Joardar JC, Parvin S, Correll R, Naidu R, 'Arsenic contamination in food-chain: Transfer of arsenic into food materials through groundwater irrigation', JOURNAL OF HEALTH POPULATION AND NUTRITION, 24 305-316 (2006)
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2006 |
Chen Z, Akter KF, Mahmudur M, Rahman, Naidu R, 'Speciation of arsenic by ion chromatography inductively coupled plasma mass spectrometry using ammonium eluents', JOURNAL OF SEPARATION SCIENCE, 29 2671-2676 (2006)
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2005 |
Sumathi KMS, Mahimairaja S, Naidu R, 'Use of low-cost biological wastes and vermiculite for removal of chromium from tannery effluent', BIORESOURCE TECHNOLOGY, 96 309-316 (2005)
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2005 |
Akter KF, Chen Z, Smith L, Davey D, Naidu R, 'Speciation of arsenic in ground water samples: A comparative study of CE-UV HG-AAS and LC-ICP-MS', TALANTA, 68 406-415 (2005)
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2005 |
Sethunathan N, Megharaj M, Smith L, Kamaludeen SPB, Avudainayagam S, Naidu R, 'Microbial role in the failure of natural attenuation of chromium(VI) in long-term tannery waste contaminated soil', AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 105 657-661 (2005)
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2005 |
Akter KF, Owens G, Davey DE, Naidu R, 'Arsenic speciation and toxicity in biological systems', REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 184, 184 97-149 (2005)
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2005 |
Li J, Xie ZM, Zhu YG, Naidu R, 'Risk assessment of heavy metal contaminated soil in the vicinity of a lead/zinc mine', JOURNAL OF ENVIRONMENTAL SCIENCES, 17 881-885 (2005)
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2004 |
Singh N, Megharaj M, Gates WP, Churchman J, Kookana RS, Naidu R, Sethunathan N, 'Sorption-desorption of fenamiphos in surfactant-modified clays', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 72 276-282 (2004)
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2004 |
Sethunathan N, Megharaj M, Chen ZL, Williams BD, Lewis G, Naidu R, 'Algal degradation of a known endocrine disrupting insecticide, alpha-endosulfan, and its metabolite, endosulfan sulfate, in liquid medium and soil', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 52 3030-3035 (2004)
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2004 |
Krishnamurti GSR, Megharaj M, Naidu R, 'Bioavailability of cadmium-organic complexes to soil alga - An exception to the free ion model', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 52 3894-3899 (2004)
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2004 |
Chen ZL, Naidu R, 'On-column complexation capillary electrophoretic separation of Fe2+ and Fe3+ using 2,6-pyridinedicarboxylic acid coupled with large-volume sample stacking', JOURNAL OF CHROMATOGRAPHY A, 1023 151-157 (2004)
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2004 |
Smith E, Smith J, Naidu R, Juhasz AL, 'Desorption of DDT from a contaminated soil using cosolvent and surfactant washing in batch experiments', WATER AIR AND SOIL POLLUTION, 151 71-86 (2004)
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2004 |
Hettipathirana TD, Grey NA, Naidu R, 'Analysis of silicates using wavelength-dispersive x-ray fluorescence spectrometry for major elements: Effects of loss elimination and catch-weights', X-RAY SPECTROMETRY, 33 117-123 (2004)
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2004 |
Bhattacharya P, Welch AH, Ahmed KM, Jacks G, Naidu R, 'Arsenic in groundwater of sedimentary aquifers', APPLIED GEOCHEMISTRY, 19 163-167 (2004)
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2004 |
Chen ZL, Megharaj M, Naidu R, 'Determination of tetrachloroethene, trichloroethylene, and their metabolites at trace levels in ground waters by on-line solid phase extraction/HPLC', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 27 885-896 (2004)
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2004 |
Kantachote D, Singleton I, Naidu R, McClure N, Megharaj M, 'Sodium application enhances DDT transformation in a long-term contaminated soil', WATER AIR AND SOIL POLLUTION, 154 115-125 (2004)
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2004 |
Kantachote D, Naidu R, Williams B, McClure N, Megharaj M, Singleton I, 'Bioremediation of DDT-contaminated soil: Enhancement by seaweed addition', JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, 79 632-638 (2004)
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2004 |
Edvantoro BB, Naidu R, Megharaj M, Merrington G, Singleton I, 'Microbial formation of volatile arsenic in cattle dip site soils contaminated with arsenic and DDT', APPLIED SOIL ECOLOGY, 25 207-217 (2004)
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2004 |
Singh N, Megharaj M, Kookana RS, Naidu R, Sethunathan N, 'Atrazine and simazine degradation in Pennisetum rhizosphere', CHEMOSPHERE, 56 257-263 (2004)
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2004 |
Kamaludeen SPB, Megharaj M, Naidu R, Singleton I, Juhasz AL, Hawke BG, Sethunathan N, 'Microbial activity and phospholipid fatty acid pattern in long-term tannery waste-contaminated soil (vol 56, pg 302, 2003)', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 57 231-231 (2004)
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2003 |
Baskaran S, Kookana RS, Naidu R, 'Contrasting behaviour of chlorpyrifos and its primary metabolite, TCP (3,5,6-trichloro-2-pyridinol), with depth in soil profiles', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 41 749-760 (2003)
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2003 |
Scott TL, Janusz A, Perkins MV, Megharaj M, Naidu R, Kirkbride KP, 'Effect of amphetamine precursors and by-products on soil enzymes of two urban soils', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 70 824-831 (2003)
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2003 |
Juhasz AL, Naidu R, Zhu YG, Wang LS, Jiang JY, Cao ZH, 'Toxicity issues associated with geogenic arsenic in the groundwater-soil-plant-human continuum', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 71 1100-1107 (2003)
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2003 |
Krishnamurti GSR, Naidu R, 'Solid-solution equilibria of cadmium in soils', GEODERMA, 113 17-30 (2003)
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2003 |
Singh N, Megharaj M, Gates WP, Churchman GJ, Anderson J, Kookana RS, et al., 'Bioavailability of an organophosphorus pesticide, fenamiphos, sorbed on an organo clay', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 51 2653-2658 (2003)
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2003 |
Wong MH, Bridges J, Bridges O, Cai ZW, Chan KKK, Dickinson NM, et al., 'Special issue: Environmental and public health management - Preface', CHEMOSPHERE, 52 1345-1346 (2003)
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2003 |
Juhasz AL, Smith E, Smith J, Naidu R, 'Development of a two-phase cosolvent washing-fungal biosorption process for the remediation of DDT-contaminated soil', WATER AIR AND SOIL POLLUTION, 146 111-126 (2003)
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2003 |
Juhasz AL, Smith E, Smith J, Naidu R, 'In situ remediation of DDT-contaminated soil using a two-phase cosolvent flushing-fungal biosorption process', WATER AIR AND SOIL POLLUTION, 147 263-274 (2003)
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2003 |
Edvantoro BB, Naidu R, Megharaj M, Singleton I, 'Changes in microbial properties associated with long-term arsenic and DDT contaminated soils at disused cattle dip sites', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 55 344-351 (2003)
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2003 |
Kamaludeen SPB, Megharaj M, Naidu R, Singleton I, Juhasz AL, Hawke BG, Sethunathan N, 'Microbial activity and phospholipid fatty acid pattern in long-term tannery waste-contaminated soil', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 56 302-310 (2003)
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2003 |
Megharaj M, Singh N, Kookana RS, Naidu R, Sethunathan N, 'Hydrolysis of fenamiphos and its oxidation products by a soil bacterium in pure culture, soil and water', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 61 252-256 (2003)
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2003 |
Bolan NS, Adriano DC, Naidu R, 'Role of phosphorus in (im)mobilization and bioavailability of heavy metals in the soil-plant system', REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 177, 177 1-44 (2003)
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2003 |
Avudainayagam S, Megharaj A, Owens G, Kookana RS, Chittleborough D, Naidu R, 'Chemistry of chromium in soils with emphasis on tannery waste sites', REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 178, 178 53-91 (2003)
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2003 |
Chen ZL, Naidu R, 'Separation of sulfur species in water by co-electroosmotic capillary electrophoresis with direct and indirect UV detection', INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, 83 749-759 (2003)
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2003 |
Megharaj M, Avudainayagam S, Naidu R, 'Toxicity of hexavalent chromium and its reduction by bacteria isolated from soil contaminated with tannery waste', CURRENT MICROBIOLOGY, 47 51-54 (2003)
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2003 |
Kanitsar K, Chen ZL, Owens G, Naidu R, 'Influence of organic modifiers on the separation of carboxylic acids using Co-EOF capillary electrophoresis', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 26 455-468 (2003)
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2003 |
Vig K, Megharaj M, Sethunathan N, Naidu R, 'Bioavailability and toxicity of cadmium to microorganisms and their activities in soil: a review', ADVANCES IN ENVIRONMENTAL RESEARCH, 8 121-135 (2003)
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2003 |
Smith E, Smith J, Smith L, Biswas T, Correll R, Naidu R, 'Arsenic in Australian environment: An overview', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 38 223-239 (2003)
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2003 |
Juhasz AL, Smith E, Smith J, Naidu R, 'Remediation of persistent organic pollutants using a novel two-phase soil washing biosorption process', Water, Air, and Soil Pollution: Focus, 3 233-242 (2003)
A two-phase soil washing biosorption process was developed for the remediation of p, p'-DDT-contaminated soil. The process involved desorption of contaminants from soil using... [more]
A two-phase soil washing biosorption process was developed for the remediation of p, p'-DDT-contaminated soil. The process involved desorption of contaminants from soil using dilute primary alcohols (40% 1-propanol) followed by contaminant removal from cosolvent solutions using fungal biosorption. Bench scale remediation studies were preformed to simulate ex situ (recycling experiment) or in situ (soil column study) treatment strategies. Both systems were effective at cleaning the soil to below Australian regulatory p, p'-DDT levels. After 50-80 hours of soil washing, over 93% of p, p'-DDT was removed from the soil (990 mg kg-1 to <65 mg kg-1) using either of these methods. p,p'-DDT was removed from the cosolvent phase by sorption onto the fungal biomass. This resulted in only low levels of p, p'-DDT remaining in the cosolvent solution (<1.5 mg 1-1). The application of both treatment strategies resulted in the rapid clean up of p, p' -DDT-contaminated soil and the potential to recycle cosolvent solutions. The ability to recycle cosolvent solutions provides a mechanism for cost reductions of the remediation strategy. © 2003 Kluwer Academic Publishers.
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2003 |
Chen ZL, Owens G, Naidu R, 'Enhanced selectivity and sensitivity for inorganic anions using an ion-pairing reagent and sample stacking in capillary zone electrophoresis with direct UV detection', ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 375 182-187 (2003)
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2003 |
Chen ZL, Lin JM, Naidu R, 'Separation of arsenic species by capillary electrophoresis with sample-stacking techniques', ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 375 679-684 (2003)
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2003 |
Janusz A, Kirkbride KP, Scott TL, Naidu R, Perkins MV, Megharaj M, 'Microbial degradation of illicit drugs, their precursors, and manufacturing by-products: implications for clandestine drug laboratory investigation and environmental assessment', FORENSIC SCIENCE INTERNATIONAL, 134 62-71 (2003)
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2003 |
Kantachote D, Singleton I, McClure N, Naidu R, Megharaj M, Harch BD, 'DDT resistance and transformation by different microbial strains isolated from DDT-contaminated soils and compost materials', COMPOST SCIENCE & UTILIZATION, 11 300-310 (2003)
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2002 |
Sethunathan N, Megharaj M, Chen Z, Singh N, Kookana RS, Naidu R, 'Persistence of endosulfan and endosulfan sulfate in soil as affected by moisture regime and organic matter addition', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 68 725-731 (2002)
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2002 |
Chen ZL, Megharaj M, Naidu R, 'Comparison of adsorbents for on-line solid-phase extraction of polycyclic aromatic hydrocarbons before liquid chromatography with UV detection', CHROMATOGRAPHIA, 56 105-108 (2002)
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2002 |
Krishnamurti GSR, Naidu R, 'Solid-solution speciation and phytoavailability of copper and zinc in soils', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 36 2645-2651 (2002)
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2002 |
Chen ZL, Naidu R, 'On-column complexation of metal ions using 2,6-pyridinedicarboxylic acid and separation of their anionic complexes by capillary electrophoresis with direct UV detection', JOURNAL OF CHROMATOGRAPHY A, 966 245-251 (2002)
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2002 |
Smith E, Naidu R, Alston AM, 'Chemistry of inorganic arsenic in soils: II. Effect of phosphorus, sodium, and calcium on arsenic sorption', JOURNAL OF ENVIRONMENTAL QUALITY, 31 557-563 (2002)
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2002 |
Chen ZL, Megharaj M, Naidu R, 'On-line solid phase extraction of pesticide residues in natural water, coupled with liquid chromatography and UV detection, using various sorbents', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 25 1779-1790 (2002)
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2002 |
Juhasz AL, Smith E, Smith J, Naidu R, 'Biosorption of organochlorine pesticides using fungal biomass', JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY, 29 163-169 (2002)
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2002 |
Chen ZL, Naidu R, 'On-column complexation and simultaneous separation of vanadium(IV) and vanadium(V) by capillary electrophoresis with direct UV detection', ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 374 520-525 (2002)
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2001 |
Avudainayagam S, Naidu R, Kookana RS, Alston AM, McClure S, Smith LH, 'Effects of electrolyte composition on chromium desorption in soils contaminated by tannery waste', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 39 1077-1089 (2001)
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2001 |
Chen ZL, Krishnamurti GSR, Naidu R, 'Separation of phenolic acids in soil and plant tissue extracts by co-electroosmotic capillary electrophoresis with direct UV detection', CHROMATOGRAPHIA, 53 179-184 (2001)
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2001 |
Naidu R, Chen ZL, 'Application of co-electroosmotic capillary electrophoresis for the determination of inorganic anions and carboxylic acids in soil and plant extract with direct UV detection', CHROMATOGRAPHIA, 54 495-500 (2001)
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2001 |
Chen ZL, Naidu R, Subramanian A, 'Separation of chromium (III) and chromium (VI) by capillary electrophoresis using 2,6-pyridinedicarboxylic acid as a pre-column complexation agent', JOURNAL OF CHROMATOGRAPHY A, 927 219-227 (2001)
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2001 |
Harter RD, Naidu R, 'An assessment of environmental and solution parameter impact on trace-metal sorption by soils', SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 65 597-612 (2001)
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2001 |
Kantachote D, Naidu R, Singleton I, McClure N, Harch BD, 'Resistance of microbial populations in DDT-contaminated and uncontaminated soils', APPLIED SOIL ECOLOGY, 16 85-90 (2001)
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2000 |
Krishnamurti GSR, Smith LH, Naidu R, 'Method for assessing plant-available cadmium in soils', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 38 823-836 (2000)
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2000 |
Krishnamurti GSR, Naidu R, 'Speciation and phytoavailability of cadmium in selected surface soils of South Australia', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 38 991-1004 (2000)
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2000 |
Chen ZL, Kookana RS, Naidu R, 'Determination of sulfonylurea herbicides in soil extracts by solid-phase extraction and capillary zone electrophoresis', CHROMATOGRAPHIA, 52 142-146 (2000)
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2000 |
Megharaj M, Singleton I, McClure NC, Naidu R, 'Influence of petroleum hydrocarbon contamination on microalgae and microbial activities in a long-term contaminated soil', ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 38 439-445 (2000)
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2000 |
Juhasz AL, Naidu R, 'Extraction and recovery of organochlorine pesticides from fungal mycelia', JOURNAL OF MICROBIOLOGICAL METHODS, 39 149-158 (2000)
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2000 |
Megharaj M, Kantachote D, Singleton I, Naidu R, 'Effects of long-term contamination of DDT on soil microflora with special reference to soil algae and algal transformation of DDT', ENVIRONMENTAL POLLUTION, 109 35-42 (2000)
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2000 |
Naidu R, Smith J, McLaren RG, Stevens DP, Sumner ME, Jackson PE, 'Application of capillary electrophoresis to anion speciation in soil water extracts: II. Arsenic', SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 64 122-128 (2000)
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2000 |
Juhasz AL, Naidu R, 'Bioremediation of high molecular weight polycyclic aromatic hydrocarbons: a review of the microbial degradation of benzo[a]pyrene', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, 45 57-88 (2000)
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2000 |
Juhasz AL, Naidu R, 'Enrichment and isolation of non-specific aromatic degraders from unique uncontaminated (plant and faecal material) sources and contaminated soils', JOURNAL OF APPLIED MICROBIOLOGY, 89 642-650 (2000)
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1999 |
Oliver DP, Tiller KG, Alston AM, Naidu R, Cozens GD, 'A comparison of three soil tests for assessing Cd accumulation in wheat grain', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 37 1123-1138 (1999)
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1999 |
Oliver DP, McLaughlin MJ, Naidu R, Smith LH, Maynard EJ, Calder IC, 'Measuring Pb bioavailability from household dusts using an in vitro model', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 33 4434-4439 (1999)
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1999 |
Baskaran S, Kookana RS, Naidu R, 'Degradation of bifenthrin, chlorpyrifos and imidacloprid in soil and bedding materials at termiticidal application rates', PESTICIDE SCIENCE, 55 1222-1228 (1999)
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1999 |
Megharaj M, Singleton I, Kookana R, Naidu R, 'Persistence and effects of fenamiphos on native algal populations and enzymatic activities in soil', SOIL BIOLOGY & BIOCHEMISTRY, 31 1549-1553 (1999)
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1999 |
Naidu R, Haynes RJ, 'Chemical composition of saturation paste extracts of a Fijian Oxisol after liming and repeated wetting and drying', TROPICAL AGRICULTURE, 76 29-35 (1999)
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1999 |
Smith E, Naidu R, Alston AM, 'Chemistry of arsenic in soils: I. Sorption of arsenate and arsenite by four Australian soils', JOURNAL OF ENVIRONMENTAL QUALITY, 28 1719-1726 (1999)
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1999 |
Juhasz AL, Naidu R, 'Apparent degradation of 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) by a Cladosporium sp.', BIOTECHNOLOGY LETTERS, 21 991-995 (1999)
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1999 |
Bolan NS, Naidu R, Khan MAR, Tillman RW, Syers JK, 'The effects of anion sorption on sorption and leaching of cadmium', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 37 445-460 (1999)
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1999 |
Bolan NS, Naidu R, Syers JK, Tillman RW, 'Surface charge and solute interactions in soils', ADVANCES IN AGRONOMY, VOL 67, 67 87-140 (1999)
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1998 |
Naidu R, 'Contaminants and the Soil Environment - Preface', GEODERMA, 84 1-2 (1998)
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1998 |
Kookana RS, Baskaran S, Naidu R, 'Pesticide fate and behaviour in Australian soils in relation to contamination and management of soil and water: a review', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 36 715-764 (1998)
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1998 |
Hamon RE, McLaughlin MJ, Naidu R, Correll R, 'Long-term changes in cadmium bioavailability in soil', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 32 3699-3703 (1998)
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1998 |
Gupta VVSR, Rogers S, Naidu R, 'Effects of secondary treated sewage effluent application on the populations of microfauna in a hardwood plantation soil: Bolivar HIAT trial', GEODERMA, 84 249-263 (1998)
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1998 |
McLaren RG, Naidu R, Smith J, Tiller KG, 'Fractionation and distribution of arsenic in soils contaminated by cattle dip', JOURNAL OF ENVIRONMENTAL QUALITY, 27 348-354 (1998)
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1998 |
Naidu R, Sumner ME, Harter RD, 'Sorption of heavy metals in strongly weathered soils: an overview', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 20 5-9 (1998)
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1998 |
Naidu R, Harter RD, 'Effect of different organic ligands on cadmium sorption by and extractability from soils', SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 62 644-650 (1998)
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1998 |
Haynes RJ, Naidu R, 'Influence of lime, fertilizer and manure applications on soil organic matter content and soil physical conditions: a review', NUTRIENT CYCLING IN AGROECOSYSTEMS, 51 123-137 (1998)
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1998 |
Naidu R, 'Preface', Geoderma, 84 1-2 (1998)
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1997 |
Fotovat A, Naidu R, Sumner ME, 'Water:Soil ratio influences aqueous phase chemistry of indigenous copper and zinc in soils', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 35 687-709 (1997)
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1997 |
Fotovat A, Naidu R, 'Ion exchange resin and MINTEQA2 speciation of Zn and Cu in alkaline sodic and acidic soil extracts', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 35 711-726 (1997)
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1997 |
Hamon R, Wundke J, McLaughlin M, Naidu R, 'Availability of zinc and cadmium to different plant species', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 35 1267-1277 (1997)
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1997 |
Naidu R, Morrison RJ, Janik L, Asghar M, 'Clay mineralogy and surface charge characteristics of basaltic soils from Western Samoa', CLAY MINERALS, 32 545-556 (1997)
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1997 |
Baskaran S, Kookana RS, Naidu R, 'Determination of the insecticide imidacloprid in water and soil using high-performance liquid chromatography', JOURNAL OF CHROMATOGRAPHY A, 787 271-275 (1997)
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1997 |
Morrison RJ, Gangaiya P, Naqasima MR, Naidu R, 'Trace metal studies in the Great Astrolabe Lagoon, Fiji, a pristine marine environment', MARINE POLLUTION BULLETIN, 34 353-356 (1997)
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1997 |
Naidu R, Kookana RS, Sumner ME, Harter RD, Tiller KG, 'Cadmium sorption and transport in variable charge soils: A review', JOURNAL OF ENVIRONMENTAL QUALITY, 26 602-617 (1997)
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1996 |
Naidu R, McClure S, McKenzie NJ, Fitzpatrick RW, 'Soil solution composition and aggregate stability changes caused by long-term farming at four contrasting sites in south Australia', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 34 511-527 (1996)
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1996 |
Fotovat A, Smith L, Naidu R, Oades JM, 'Analysis of indigenous zinc in alkaline sodic soil solutions by graphite furnace atomic absorption spectrometry', COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 27 2997-3012 (1996)
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1996 |
McLaughlin MJ, Tiller KG, Naidu R, Stevens DP, 'Review: The behaviour and environmental impact of contaminants in fertilizers', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 34 1-54 (1996)
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1994 |
NAIDU R, MITCHELL BD, MACKENZIE RC, 'EFFECT OF DRAINAGE ON CHARACTERISTICS OF SOME SOILS OF THE ORKNEY ISLANDS', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 32 519-534 (1994)
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1994 |
KOOKANA RS, NAIDU R, TILLER KG, 'SORPTION NONEQUILIBRIUM DURING CADMIUM TRANSPORT THROUGH SOILS', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 32 635-651 (1994)
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1994 |
FITZPATRICK RW, BOUCHER SC, NAIDU R, FRITSCH E, 'ENVIRONMENTAL CONSEQUENCES OF SOIL SODICITY', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 32 1069-1093 (1994)
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1994 |
BOLAN NS, NAIDU R, MAHIMAIRAJA S, BASKARAN S, 'INFLUENCE OF LOW-MOLECULAR-WEIGHT ORGANIC-ACIDS ON THE SOLUBILIZATION OF PHOSPHATES', BIOLOGY AND FERTILITY OF SOILS, 18 311-319 (1994)
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1994 |
NAIDU R, BOLAN NS, KOOKANA RS, TILLER KG, 'IONIC-STRENGTH AND PH EFFECTS ON THE SORPTION OF CADMIUM AND THE SURFACE-CHARGE OF SOILS', EUROPEAN JOURNAL OF SOIL SCIENCE, 45 419-429 (1994)
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1993 |
NAIDU R, RENGASAMY P, 'ION INTERACTIONS AND CONSTRAINTS TO PLANT NUTRITION IN AUSTRALIAN SODIC SOILS', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 31 801-819 (1993)
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1993 |
NAIDU R, MERRY RH, CHURCHMAN GJ, WRIGHT MJ, MURRAY RS, FITZPATRICK RW, ZARCINAS BA, 'SODICITY IN SOUTH AUSTRALIA - A REVIEW', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 31 911-929 (1993)
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1993 |
NAIDU R, SUMNER ME, RENGASAMY P, 'NATIONAL CONFERENCE ON SODIC SOILS - SUMMARY AND CONCLUSIONS', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 31 949-956 (1993)
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1993 |
NAIDU R, WILLIAMSON DR, FITZPATRICK RW, HOLLINGSWORTH IO, 'EFFECT OF LANDUSE ON THE COMPOSITION OF THROUGHFLOW WATER IMMEDIATELY ABOVE CLAYEY-B HORIZONS IN THE WARREN CATCHMENT, SOUTH-AUSTRALIA', AUSTRALIAN JOURNAL OF EXPERIMENTAL AGRICULTURE, 33 239-244 (1993)
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1993 |
NAIDU R, WILLIAMSON DR, FITZPATRICK RW, HOLLINGSWORTH IO, 'EFFECT OF LANDUSE ON THE COMPOSITION OF THROUGHFLOW WATER IMMEDIATELY ABOVE CLAYEY-B HORIZONS IN THE WARREN CATCHMENT, SOUTH-AUSTRALIA (VOL 33, PG 239, 1993)', AUSTRALIAN JOURNAL OF EXPERIMENTAL AGRICULTURE, 33 U259-U259 (1993) |
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1993 |
NAIDU DR, 'DISTRIBUTION, PROPERTIES AND MANAGEMENT OF SODIC SOILS - AN INTRODUCTION', AUSTRALIAN JOURNAL OF SOIL RESEARCH, 31 681-682 (1993)
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1992 |
Fitzpatrick RW, Naidu R, Self PG, 'Iron deposits and microorganisms in saline sulfidic soils with altered soil water regimes in South Australia', Catena Supplement, 21 263-286 (1992)
The precipitates found in oxidized surface layers of waterlogged Mollic Natraqualfs during the wet winter months and the thin crusts formed on the soil surface in the dry summer m... [more]
The precipitates found in oxidized surface layers of waterlogged Mollic Natraqualfs during the wet winter months and the thin crusts formed on the soil surface in the dry summer months were investigated in catchments subject to rising saline watertables folllowing partial deforestation in the Mount Lofty Ranges in South Australia. The gelatinous iron-rich precipitates found in the oxidized surface layers of these soils results from rapid bacterial and chemical oxidation of the Fe2+ in the seepage waters formed within these soils. Powder X-ray diffraction, thermal and thermogravimetric analyses, and microscopy studies showed the presence of poorly-crystalline, hydrous iron oxide minerals (mainly ferrihydrite with traces of goethite). Ferrihydrite together with poorly crystalline goethite and traces of a similar pooly crystalline oxyhydroxysulfate mineral was identified in the thin reddish-brown crusts that form in summer around margins of the saline seep areas. -from Authors
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1992 |
Naidu R, Hollingsworth I, Fitzpatrick RW, 'Warren Reservoir catchment studies: chemistry of throughflow water immediately above sodic B horizons', Australian Journal of Experimental Agriculture, 32 992 (1992)
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1992 |
NAIDU R, SYERS JK, 'INFLUENCE OF SUGARCANE MILLMUD, LIME, AND PHOSPHORUS, ON SOIL CHEMICAL-PROPERTIES AND THE GROWTH OF LEUCAENA-LEUCOCEPHALA IN AN OXISOL FROM FIJI', BIORESOURCE TECHNOLOGY, 41 65-70 (1992)
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1991 |
NAIDU R, SYERS JK, TILLMAN RW, KIRKMAN JH, 'ASSESSMENT OF PLANT-AVAILABLE PHOSPHATE IN LIMED, ACID SOILS USING SEVERAL SOIL-TESTING PROCEDURES', FERTILIZER RESEARCH, 30 47-53 (1991)
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1991 |
CURTIN D, NAIDU R, SYERS JK, 'CHEMICAL AND MINERALOGICAL CHARACTERISTICS OF SOME STRONGLY WEATHERED FIJIAN SOILS - FERTILITY IMPLICATIONS', GEODERMA, 48 363-372 (1991)
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1990 |
NAIDU R, SYERS JK, TILLMAN RW, KIRKMAN JH, 'EFFECT OF LIMING AND ADDED PHOSPHATE ON CHARGE CHARACTERISTICS OF ACID SOILS', JOURNAL OF SOIL SCIENCE, 41 157-164 (1990)
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1990 |
NAIDU R, SYERS JK, TILLMAN RW, KIRKMAN JH, 'EFFECT OF LIMING ON PHOSPHATE SORPTION BY ACID SOILS', JOURNAL OF SOIL SCIENCE, 41 165-175 (1990)
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1990 |
NAIDU R, TILLMAN RW, SYERS JK, KIRKMAN JH, 'LIME-ALUMINUM-PHOSPHORUS INTERACTIONS AND THE GROWTH OF LEUCAENA-LEUCOCEPHALA .1. PLANT-GROWTH STUDIES', PLANT AND SOIL, 126 1-8 (1990)
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1990 |
NAIDU R, TILLMAN RW, SYERS JK, KIRKMAN JH, 'LIME-ALUMINUM-PHOSPHORUS INTERACTIONS AND THE GROWTH OF LEUCAENA-LEUCOCEPHALA .2. CHEMICAL-COMPOSITION', PLANT AND SOIL, 126 9-17 (1990)
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1988 |
NAIDU R, SYERS JK, TILLMAN RW, LEE R, KIRKMAN JH, 'EXTRACTION OF ALUMINUM FROM ACID, STRONGLY WEATHERED FIJIAN SOILS USING M KCL - A COMPARISON OF METHODS OF EXTRACTION AND DETERMINATION', JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, 45 291-299 (1988)
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1987 |
NAIDU R, TILLMAN RW, SYERS JK, KIRKMAN JH, 'EFFECT OF LIMING ON PHOSPHATE EXTRACTED BY 2 SOIL-TESTING PROCEDURES', FERTILIZER RESEARCH, 14 143-152 (1987)
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1987 |
NAIDU R, KIRKMAN JH, MORRISON RJ, 'MINERALOGY OF SOILS FROM BASALTIC ASH, TAVEUNI, FIJI', GEODERMA, 39 181-192 (1987)
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