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 |
Onaizi AM, Tang W, Amran M, Liu Y, Sajjad U, Alhassan M, 'Towards increased adoption of furnace bottom ash as sustainable building materials: Characterization, standardization, and applications', Journal of Building Engineering, 82 (2024) [C1]
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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 |
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 |
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 |
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 |
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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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 |
Yang XD, Anwar E, Xu YL, Zhou J, Sha LB, Gong XW, et al., 'Hydraulic constraints determine the distribution of heteromorphic leaves along plant vertical height', Frontiers in Plant Science, 13 (2022) [C1]
As an interesting and important trait of some drought-tolerant species, heteromorphic leaves are distributed differentially along plant vertical heights. However, the underpinning... [more]
As an interesting and important trait of some drought-tolerant species, heteromorphic leaves are distributed differentially along plant vertical heights. However, the underpinning mechanism for the formation of heteromorphic leaves remains unclear. We hypothesize that heteromorphic leaves are caused by the hydraulic constraints possibly due to the compensation of the changes in functional traits in response to water transport capacity or the reduction of ineffective water loss. In this study, differences in water transport capacity, morphological traits, anatomical structures, and cellular water relations among three typical types of heteromorphic leaves (i.e., lanceolate, ovate, and broad-ovate) of Populus euphratica Oliv. (a dominant species of desert riparian forest in Central and West Asia) and their relationships were analyzed in order to explore the forming mechanism of heteromorphic leaves. The results showed that the lanceolate, ovate, and broad-ovate leaves were growing in the lower, intermediate, and higher positions from the ground, respectively. Morphological traits, anatomical structures, cellular water relations, and water transport capacity significantly varied among the three types of heteromorphic leaves (P< 0.01). Drought stress in broad-ovate leaves was significantly higher than that in ovate and lanceolate leaves (P< 0.01). Water transport capacity has significant correlations with morphological traits, anatomical structures, and cellular water relations (R2 = 0.30; P< 0.01). Our results indicated that heteromorphic leaves were used as an important adaptive strategy for P. euphratica to alleviate the increase of hydraulic constraints along vertical heights.
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2022 |
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 |
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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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) [C1]
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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 |
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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2022 |
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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2022 |
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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2022 |
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 |
Zheng L, Ji H, Gao Y, Yang Z, Ji L, Zhao Q, et al., 'Effects of Modified Biochar on the Mobility and Speciation Distribution of Cadmium in Contaminated Soil', PROCESSES, 10 (2022) [C1]
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2022 |
Chen Y, Wang L, Hassan M, Liu Y, Wang X, Ren D, 'Removal of aqueous lead ions by iron ore tailings/straw biochar composite and its underlying sorption mechanism', Desalination and Water Treatment, 269 176-187 (2022) [C1]
A composite material was prepared from iron tailings and straw biochar for lead (Pb) removal from aqueous solution. Microscopic analysis revealed that the surface area of the comp... [more]
A composite material was prepared from iron tailings and straw biochar for lead (Pb) removal from aqueous solution. Microscopic analysis revealed that the surface area of the composite was 131.84 m2/g and the porosity was predominantly an irregular mesoporous structure (~3.65 nm) in size, and the predominant mineral phases were identified as quartz, magnetite and calcite. The effects of solution pH, adsorbent dosage, contact time, initial sorbate concentration, and temperature on lead(II) removal were investigated. The results showed that the composite could remove 97.05% of lead(II), where solution pH was 5.0, adsorbent dosage was 1.00 g/L, and initial lead(II) concentration was 200 mg/L. The adsorption fitted well to the Langmuir isotherm model, demonstrated monolayer formation of lead ions onto the adsorbent, and the theoretical maximum adsorption capacity of lead(II) was 330.03 mg/g. Adsorption kinetics and thermodynamic indicated that the adsorption reaction was spontaneous and mainly controlled by chemisorption due to presence of abundance of oxygen-containing functional groups and active sites derived from straw and iron ore tailings could bond with lead(II), and columnar cerussite crystals from the reaction between Pb2+ 2¿ and CO3 released from the materials were fixed the surface and inside of the materials, improved lead(II) adsorption.
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2021 |
Long Y, Yang X, Cao Y, Lv G, Li Y, Pan Y, et al., 'Relationship between Soil Fungi and Seedling Density in the Vicinity of Adult Conspecifics in an Arid Desert Forest', FORESTS, 12 (2021) [C1]
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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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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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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 |
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 |
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 |
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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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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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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2021 |
Weng H, Gao Y, Su X, Yang X, Cheng F, Ma R, et al., 'Spatial-Temporal Changes and Driving Force Analysis of Green Space in Coastal Cities of Southeast China over the Past 20 Years', LAND, 10 (2021) [C1]
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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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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 |
Luo X, Wang X, Tang Y, Liu Y, Wang Y, 'Using quantitative ion character-activity relationship (QICAR) method in evaluation of metal toxicity toward wheat', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 221 (2021) [C1]
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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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
Tang WC, Wang Z, Donne SW, Forghani M, Liu Y, 'Influence of red mud on mechanical and durability performance of self-compacting concrete', Journal of Hazardous Materials, 379 (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 |
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 |
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 |
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 |
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 |
Tang WC, Wang Z, Liu Y, Cui HZ, 'Influence of red mud on fresh and hardened properties of self-compacting concrete', Construction and Building Materials, 178 288-300 (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 |
Wang F, Xu Y, Yang X, Liu Y, Lv GH, Yang S, 'Soil water potential determines the presence of hydraulic lift of populus euphratica olivier across growing seasons in an arid desert region', Journal of Forest Science, 64 319-329 (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 |
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 |
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 |
Tan X, Liu Y, Yan K, Wang Z, Lu G, He Y, He W, 'Differences in the response of soil dehydrogenase activity to Cd contamination are determined by the different substrates used for its determination', CHEMOSPHERE, 169 324-332 (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 |
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 |
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 |
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 |
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 |
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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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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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 |
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 |
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 |
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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Nova |
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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Nova |
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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Nova |
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 |
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 |
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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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 |
Liu Y, Naidu R, 'Hidden values in bauxite residue (red mud): Recovery of metals', WASTE MANAGEMENT, 34 2662-2673 (2014)
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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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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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2010 |
Liu YJ, Gong WQ, Zeng SJ, Liu J, Pi KW, Li YB, Hu F, 'Study of domestication of acidithiobacillus and effects on leaching of low grade phosphate ore', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 32 5-8 (2010)
Strains of Acidithiobacillus ferrooxidans (Atf) and Acidithiobacillus thiooxidans (Att) were isolated and purified from water samples collected from a hot spring in Guangxi provin... [more]
Strains of Acidithiobacillus ferrooxidans (Atf) and Acidithiobacillus thiooxidans (Att) were isolated and purified from water samples collected from a hot spring in Guangxi province. The purified Atf and Att were used in the leaching of a low grade phosphate ore. The results were compared with those obtained with Atf and Att after domestication. The results indicated that: 1) The activity of those domesticated Acidithiobacillus was enhanced, as the average pH value of Att was lower than the original ones and an obvious reduction of pH of the Atf which was domesticated by low grade phosphate ore with the concentration of 5~10 g/L was observed; 2) The domesticated Acidithiobacillus were easily adapted to the lixivium of phosphate ore with rapid decrease of pH value and high leaching rate at the 30th day of bioleaching. Particularly, the leaching rate was enhanced by up to 11%, with Att domesticated with both culture media with or without phosphate. The Atf domesticated with 2~8 g/L phosphate ore in culture media with phosphate increased the leaching rate by 28% at most. Meanwhile, the leaching rate of Atf domesticated with 10~15 g/L phosphate ore in culture media without phosphate was amolst 2 times of the original ones.
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2009 |
Zeng SJ, Gong WQ, Liu YJ, Liu J, Pi KW, Li YB, Hu F, 'Research on effects of ways of stirring on bacterial leaching of phosphate', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 31 (2009)
Difference ways of stirring, i.e. no-stirring, shaking, magnetic stirring and mechanical stirring, were employed in the bioleaching of phosphate in the ore. The leaching effects w... [more]
Difference ways of stirring, i.e. no-stirring, shaking, magnetic stirring and mechanical stirring, were employed in the bioleaching of phosphate in the ore. The leaching effects with different ways of stirring were analyzed and compared, revealing the factors responsible for the leaching of phosphorus element. The experimental results indicated that the leaching effects with magnetic stirring and mechanical stirring were obviously better than those with no-stirring and shaking and the leaching time was reduced significantly. The qualitative analysis using scanning electron microscope and energy dispersive spectroscopy showed that jarosite was one of the products of bacterial leaching and the major factor influencing the leaching effects.
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2009 |
Liu YJ, Gong WQ, Zeng SJ, Liu J, Pi KW, Li YB, et al., 'Research on cultivation of acidithiobacillus strains by microwave mutagenesis for bioleaching of low-grade phosphate ore', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 31 16-19 (2009)
Microwave mutagenesis is an effective physical method to cultivate high quality microbial strains. In this article, continuous and discontinuous microwave mutagenesis methods are ... [more]
Microwave mutagenesis is an effective physical method to cultivate high quality microbial strains. In this article, continuous and discontinuous microwave mutagenesis methods are used to cultivate acidithiobacillus (At t and At f) strains. As a result, the optimized mutagenesis conditions for different acidithiobacillus strains are worked out. The effects of recycling the bacteria after bioleaching upon the activity of the bacteria and bioleaching rate of phosphate ore are investigated. The results indicate that both the bacteria activity and bioleaching rate of phosphate ore are enhanced significantly.
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2008 |
Wang EW, Gong WQ, Shen QS, Liu J, Liu YJ, Zeng SJ, 'Effects of physical mutagenesis on leaching phosphorus with acidithiobacillus ferrooxidans', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 30 44-47 (2008)
Strains of acidithiobacillus ferrooxidans were separated and purified from water samples collected from a hot spring in Guangxi province. The purified At f was used in the leachin... [more]
Strains of acidithiobacillus ferrooxidans were separated and purified from water samples collected from a hot spring in Guangxi province. The purified At f was used in the leaching of a low grade phosphate ore. The results were compared with those obtained with At f after physical mutagenesis. The results indicated that: 1) the rate of phosphorus leached with purified At f was higher than that with unpurified At f, with the fifth purification being the best. 2) The oxidation activity and rate of phosphorus leached with At f after UV mutagenesis increased initially and then decreased as a function of mutagenesis time with an optimum occurred at 5 min. 3) The time for complete oxidation of Fe2+ with At f, after ultrasonic mutagenesis was at lease 65 h shorter than that with At f, before ultrasonic mutagenesis and the rate of phosphorus leached increased by up to about 35%. 4) With low temperature mutagenesis the optimal results were obtained with At f after 1 h low temperature mutagenesis.
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2008 |
Shen QS, Gong WQ, Wang EW, Liu J, Liu YJ, Zeng SJ, 'Bioleaching of low-grade phosphate ore with microwave-mutated acidithiobacillus thiooxidans', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 30 29-32 (2008)
A strain of Acidithiobacillus thiooxidans (At t) isolated from a sulfur-containing hot spring in Guangxi was used to leach low-grade phosphate ore after being purified and cultiva... [more]
A strain of Acidithiobacillus thiooxidans (At t) isolated from a sulfur-containing hot spring in Guangxi was used to leach low-grade phosphate ore after being purified and cultivated. Then microwave mutagenesis study was carried out with the strain. The isolated and purified strain of At t had the capability of leaching low-grade phosphate ore, but the leaching-rate was low. Microwave could cause mutation of At t effectively and change its growth activity and acid-producing capacity. Strains treated for different mutagenesis time showed different bioleaching ability. The leaching-rate of the strain mutagenized with microwave for 10 s was the highest and reached 32.74% after bioleaching for 20 d, which increased almost 42% than that of the original At t strain.
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2007 |
Gong W, Zhang X, Yuan H, Liu Y, Bian X, Chen W, Liu J, 'Experimental Study on Bacterial Leaching of Low-Grade Phosphate Gangue', Journal of Shanghai Second Polytechnic University, 24 125-130 (2007) |
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2007 |
Gong WQ, Chen W, Zhang XZ, Bian X, Liu YJ, Liu J, et al., 'Isolation and cultivation of acidithiobacillus ferrooxidans and its effects on bioleaching of phosphate ore', Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering, 7 584-588 (2007)
A strain of Acidithiobacillus ferrooxidans that can be used effectively in the leaching of low grade phosphate ore was isolated from acid mine drainage from a coal mine in Anhui P... [more]
A strain of Acidithiobacillus ferrooxidans that can be used effectively in the leaching of low grade phosphate ore was isolated from acid mine drainage from a coal mine in Anhui Province in China. Its characteristics of morphology and growth were studied. Through the investigation of the effects of different solid culture medium components on the isolation and purification of Acidthiobacillus ferrooxidans, the optimum isolation conditions were determined as: the concentration of Fe2+ in 9 K solid culture medium was 4.5 g/L. A double-layer plate, with heterotrophic microbe Rhodotorula sp. spreading onto the bottom layer and chemoautotrophic bacterium At.f spreading onto the upper layer, was used. The influential factors including culture media, energy source materials and the addition of surfactant on the leaching of phosphate ore with the cultivated At. f were studied. Through preliminary experiments, up to 48% of phosphate in the ore was leached out using the isolated At. f strain.
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2007 |
Gong WQ, Bian X, Chen W, Zhang XZ, Liu YJ, Liu J, et al., 'Cultivation characteristics of acidithiobacillus thiooxidans and bioleaching of low-grade phosphate ore with it', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 29 53-57 (2007)
A strain of Acidithiobacillus thiooxidans (At. t) that can be used effectively in the leaching of low-grade phosphate ore was isolated from acid mine drainage from a coal mine in ... [more]
A strain of Acidithiobacillus thiooxidans (At. t) that can be used effectively in the leaching of low-grade phosphate ore was isolated from acid mine drainage from a coal mine in Anhui. Its characteristics of morphology and cultivation were studied. Through the investigation of the effect of different solid culture medium components on the isolation and purification of Acidthiobacillus thiooxidans, the optimum isolation conditions were determined by using a double-layer plate with chemoautotrophic bacterium At. t spread onto the upper Starkey solid culture medium layer, and heterotrophic microbe Rhodotorula sp. spread onto the bottom agar layer, resulting in significantly increased density and reduced forming time of the bacterial colony. The influence of factors including culture media and the addition of surfactant on the leaching of phosphate ore with the cultivated At. t was studied. Through preliminary experiments, up to 48.41% of phosphate in the ore was leached out by using the isolated At. t strain.
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2007 |
Gong WQ, Zhang XZ, Liu YJ, Chen W, Bian X, Liu J, et al., 'Influence of surfactants on leaching of phosphate ore with Acidithiobacillus thiooxidans', Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology), 38 60-64 (2007)
During the leaching of phosphate ore with sulfuric acid produced by the oxidation of reductive sulfur with Acidithiobacillus, different types of Tween surfactants were used to pro... [more]
During the leaching of phosphate ore with sulfuric acid produced by the oxidation of reductive sulfur with Acidithiobacillus, different types of Tween surfactants were used to promote the interaction between the bacteria and the ore and to increase the rate of phosphate leached. The effects of the surfactants on the phosphate ore leaching with Acidithiobacillus thiooxidans were evaluated by measuring the pH value of solution, the density of bacteria cell in solution and the rate of phosphate leached. The results show that Tween 20, 60 and 80 all can improve the leaching of the ore and the optimal dosages are 10, 10 and 100 g/m3, respectively. The effect of Tween 60 is the best with about 15% increase of the rate of phosphate leached with a dosage of 10 g/cm3.
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