Dr Girish Choppala

Dr Girish Choppala

Research Associate

School of Environmental and Life Sciences

Career Summary

Biography

Girish conducts research in the broad fields of environmental geochemistry, mineralogy, contaminant transport, and transformation.  In particular, he is interested in

  • Understanding the fundamental processes of iron minerals and associated toxic metals and metalloids in soils, mine waste and sediments.
  • Cycling of trace elements and nutrients in estuarine sediments. 
  • Dissolution kinetics of toxic metals bearing iron minerals under variable environmental conditions.
  • Development of ecological guideline values and ligand models for toxic metals and metalloids.
  • Application of synchrotron-based XAS techniques in resolving biogeochemical transformation of iron, sulfur, and trace metals at the mineral-water interface.



Qualifications

  • Doctor of Philosophy, University of South Australia

Keywords

  • Contamination
  • Environmental Geochemistry
  • Environmental Impact Assessment
  • Mineralogy
  • X-ray Absorption Spectroscopy

Languages

  • English (Fluent)
  • Telugu (Mother)

Fields of Research

Code Description Percentage
370302 Inorganic geochemistry 50
410599 Pollution and contamination not elsewhere classified 30
410402 Environmental assessment and monitoring 20

Professional Experience

UON Appointment

Title Organisation / Department
Research Associate University of Newcastle
School of Environmental and Life Sciences
Australia

Professional appointment

Dates Title Organisation / Department
20/9/2022 -  Editor Soil Systems
Switzerland
25/8/2020 -  Editor Journal of Soils and Sediments
Australia
13/12/2017 -  Editor Journal of Contaminant Hydrology
Netherlands
Edit

Publications

For publications that are currently unpublished or in-press, details are shown in italics.

Highlighted Publications

Year Citation Altmetrics Link
2021 Burton ED, Karimian N, Johnston SG, Schoepfer VA, Choppala G, Lamb D, 'Arsenic-Imposed Effects on Schwertmannite and Jarosite Formation in Acid Mine Drainage and Coupled Impacts on Arsenic Mobility', ACS EARTH AND SPACE CHEMISTRY, 5, 1418-1435 (2021) [C1]
DOI 10.1021/acsearthspacechem.1c00047
Citations Scopus - 5Web of Science - 43
2022 Choppala G, Karimian N, Burton ED, 'An X-ray absorption spectroscopic study of the Fe(II)-induced transformation of Cr(VI)-substituted schwertmannite', JOURNAL OF HAZARDOUS MATERIALS, 431 (2022) [C1]

The environmental chemistry of Cr is of widespread interest due to the hazardous nature of Cr(VI). Because of similar atomic size and charge, CrVIO42- can substitute for SO42- wit... [more]

The environmental chemistry of Cr is of widespread interest due to the hazardous nature of Cr(VI). Because of similar atomic size and charge, CrVIO42- can substitute for SO42- within schwertmannite - an Fe(III) oxyhydroxysulfate mineral that occurs widely in acidic and sulfate-rich systems. The presence of aqueous Fe(II) can induce transformation of schwertmannite to more stable Fe(III) phases (e.g. goethite) which may potentially impact the behaviour of co-associated Cr(VI). Here, we investigate the Fe(II)-induced transformation of Cr(VI)-substituted schwertmannite as a function of pH (4-8) and the degree of Cr(VI) substitution (0.16¿13 mol% CrVIO42--for-SO42- substitution). Iron K-edge EXAFS spectroscopy revealed that higher levels of Cr(VI) substitution inhibited Fe(II)-induced schwertmannite transformation. Chromium K-edge XANES spectroscopy indicated that this outcome could be partly attributed to consumption of Fe(II) by reaction with Cr(VI), and the resulting formation of a passivating Cr(III)-Fe(III) hydroxide phase which stabilizes schwertmannite at greater levels of Cr(VI) substitution and at higher pH while also decreasing further reduction of structural Cr(VI). Overall, this study enriches our understanding of interactions between hazardous Cr(VI) and schwertmannite in environmental and engineered systems.

DOI 10.1016/j.jhazmat.2022.128580
Citations Scopus - 1Web of Science - 13

Book (1 outputs)

Year Citation Altmetrics Link
2018 Bolan N, Spoil to Soil: Mine Site Rehabilitation and Revegetation 1st Edition by N.S. Bolan (Editor), M.B. Kirkham (Editor), Y.S. Ok (Editor), CRC Press, USA (2018)
Co-authors Balaji Seshadri, Ravi Naidu

Chapter (7 outputs)

Year Citation Altmetrics Link
2025 Choppala G, Naidu R, 'Derelict mine sites-Australian perspective', 37-56 (2025) [B1]
DOI 10.1201/9781315141855-3
Co-authors Ravi Naidu
2017 Bolan N, 'Spoil to Soil: Mine Site Rehabilitation and Revegetation 1st Edition by N.S. Bolan (Editor), M.B. Kirkham (Editor), Y.S. Ok (Editor)', USA-USA (2017)
Citations Scopus - 1
Co-authors Balaji Seshadri, Ravi Naidu
2017 Kunhikrishnan A, Bolan NS, Chowdhury S, Park JH, Kim HS, Choppala G, Singh BP, Kim W, 'Dynamics of heavy metal(loid)s in mine soils', 259-288 (2017)

Mine sites can be a potential threat to public health due to the risk of polluting nearby groundwater and soils. During the early mining period, mining companies had less strict r... [more]

Mine sites can be a potential threat to public health due to the risk of polluting nearby groundwater and soils. During the early mining period, mining companies had less strict remediation codes than those in place now, and waste material was customarily disposed in heaps (tailings) in the direct vicinity of the mine (Johnson et al. 2016; Pascaud et al. 2015). Once the ore was exhausted, companies either closed down or moved out, many of them leaving their mining waste behind. These abandoned wastes are considered among the worst environmental problems and a serious hazard to ecosystems and human health (Anawar 2015; Fields 2003; Hudson-Edwards et al. 2011). Tailing deposits generated from mining activities pose a potential risk for the soil and aquatic environments through the release of potentially toxic metal(loid)s occurring in a variety of minerals present in the tailings (Anawar 2015; Hudson-Edwards et al. 2011). Heavy metal(loid)s include both biologically essential (e.g., cobalt [Co], copper [Cu], chromium [Cr], manganese [Mn], and zinc [Zn]) and nonessential (e.g., arsenic [As], cadmium [Cd], lead [Pb], and mercury [Hg]) elements. The nonessential elements are highly toxic; however, at excessive concentrations, both groups are toxic to plants, animals, and/or humans (Adriano 2001; Alloway 1990)

DOI 10.1201/9781351247337-15
Citations Scopus - 2
2017 Kunhikrishnan A, Choppala G, Seshadri B, Park JH, Mbene K, Yan Y, Bolan NS, 'Biotransformation of heavy metal(loid)s in relation to the remediation of contaminated soils', 67-86 (2017)

The dynamics of trace elements in soils is dependent on both their physicochemical interactions with inorganic and organic soil constituents and their biological interactions link... [more]

The dynamics of trace elements in soils is dependent on both their physicochemical interactions with inorganic and organic soil constituents and their biological interactions linked to the microbial activities of soil-plant systems. Microorganisms control the transformation (microbial or biotransformation) of trace elements by several mechanisms that include oxidation, reduction, methylation, demethylation, complex formation, and biosorption. Microbial transformation plays a major role in the behavior and fate of toxic elements, especially arsenic (As), chromium (Cr), mercury (Hg), and selenium (Se) in soils and sediments. Biotransformation processes can alter the speciation and redox state of these elements and hence control their solubility and subsequent mobility. These processes play an important role in the bioavailability, mobility, ecotoxicity, and environmental health of these trace elements. A greater understanding of biotransformation processes is necessary to efficiently manage and utilize them for contaminant removal and to develop in situ bioremediation technologies. In this chapter, the key microbial transformation processes, including biosorption, redox reactions, and methylation/demethylation reactions controlling the fate and behavior of As, Cr, Hg, and Se, are addressed. The factors affecting these processes in relation to the bioavailability and remediation of trace elements in the environment are also examined, and possible future research directions are recommended.

DOI 10.1201/9781315153353
Citations Scopus - 4
Co-authors Balaji Seshadri
2016 Niazi NK, Murtaza B, Bibi I, Shahid M, White JC, Nawaz MF, Bashir S, Shakoor MB, Choppala G, Murtaza G, Wang H, 'Removal and Recovery of Metals by Biosorbents and Biochars Derived From Biowastes', 149-177 (2016)

The production of biosorbents and biochars from various biowastes (such as the agricultural and food industries and algal and fungal biomass) has received considerable attention b... [more]

The production of biosorbents and biochars from various biowastes (such as the agricultural and food industries and algal and fungal biomass) has received considerable attention because of their potential use in the removal and recovery of elements, such as precious metals and heavy metals from water and wastewater. Recovery of these metals from their aqueous solutions has emerged as an exciting area of research as a result of increasing or fluctuating prices of metals (eg, precious metals), limited availability of their deposits, and the ever-increasing demand and time- and energy-consuming processes needed to mine metal deposits. This review will summarize the various sources of metals, the available biowastes of the agricultural and food industries, and preparation methods for biosorbents and biochars from biowastes. We will focus on metal and heavy metal removal and recovery from waste and wastewater, methods for metal recovery, pretreatment and modification of biosorbents and biochars for enhanced metal sequestration, and strategies to provide stability to biosorbents and biochars to maximize resource recovery.

DOI 10.1016/B978-0-12-803837-6.00007-X
Citations Scopus - 54
2015 Thangarajan R, Bolan N, Mandal S, Kunhikrishnan A, Choppala G, Karunanithi R, Qi F, 'Biochar for inorganic contaminant Management in Soil' (2015)
Citations Scopus - 6
2015 Kunhikrishnan A, Bibi I, Bolan N, Seshadri B, Choppala G, Niazi NK, Kim WI, Sik YS, 'Biochar for inorganic contaminant management in waste and wastewater' (2015)
Citations Scopus - 2
Co-authors Balaji Seshadri
Show 4 more chapters

Conference (1 outputs)

Year Citation Altmetrics Link
2019 Yeasmin M, Abbasi S, Choppala G, Lamb D, Rahman M, Naidu R, 'Are root elongation assays suitable for metallic anion ecotoxicity thresholds?' (2019)
Co-authors Liang Wang, Mahmud Rahman, Ravi Naidu

Journal article (53 outputs)

Year Citation Altmetrics Link
2024 Bari ASMF, Choppala G, Lamb D, Hamilton JL, Sathish C, Rahman MM, Naidu R, Aughterson R, Burton ED, 'Is beudantite a stable host phase of arsenic and lead? New insights from molecular-scale kinetic analyses', JOURNAL OF HAZARDOUS MATERIALS, 480 (2024) [C1]

Beudantite, an As-Pb containing Fe(III) sulfate secondary mineral, is formed via the oxidation of sulfide-rich tailings in mining-impacted regions. The geochemical stability of be... [more]

Beudantite, an As-Pb containing Fe(III) sulfate secondary mineral, is formed via the oxidation of sulfide-rich tailings in mining-impacted regions. The geochemical stability of beudantite plays a key role in controlling the cycling and transport of As and Pb in mine sites. However, the fate of beudantite under dynamic pH conditions and its effect on As and Pb mobility remain elusive. We investigated the mobility dynamics of As and Pb during the dissolution of beudantite under variable pH conditions (2-8) relevant to mine sites by using a complementary suite of analytical methods. Results demonstrate that under acidic pH conditions, aqueous As and Pb content increased slightly, with just 0.7 % and 6.7 % of As and Pb partitioned from the beudantite crystal structure over 56 days. Notably, the rate at which the dissolution of beudantite led to solubilization of elements followed the order Fe > As > Pb within the first 2 h of dissolution. In contrast, the order shifted to Pb > Fe > As after 2 h. Arsenic K-edge X-ray absorption spectroscopy analyses revealed no shifts in As speciation or secondary mineralogical transformation. Here, we show for the first time that beudantite could be considered a relatively stable mineral host for As and Pb over a broad spectrum of environmental conditions. Beudantite can be expected to immobilise metals liberated by the primary weathering of sulfide-rich mine wastes, thereby lowering the risk to the environment and human health resulting from their discharge into the surrounding environment and aquifer.

DOI 10.1016/j.jhazmat.2024.136382
Citations Scopus - 1
Co-authors Sathish Ci, Ravi Naidu, Mahmud Rahman
2024 Rastegari M, Karimian N, Johnston SG, Choppala G, Moghaddam MH, Burton ED, 'Antimony sorption to schwertmannite in acid sulfate environments', Journal of Hazardous Materials, 478 (2024) [C1]

Schwertmannite is a poorly-crystalline Fe(III) oxyhydroxysulfate mineral that may control Sb(V) mobility in acid sulfate environments, including acid mine drainage and acid sulfat... [more]

Schwertmannite is a poorly-crystalline Fe(III) oxyhydroxysulfate mineral that may control Sb(V) mobility in acid sulfate environments, including acid mine drainage and acid sulfate soils. However, the mechanisms that govern uptake of aqueous Sb(V) by schwertmannite in such environments are poorly understood. To address this issue, we examined Sb(V) sorption to schwertmannite across a range of environmentally-relevant Sb(V) loadings at pH 3 in sulfate-rich solutions. Antimony K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy revealed that Sb(V) sorption (at all loadings) involved edge and double-corner sharing linkages between SbVO6 and FeIIIO6 octahedra. The coordination numbers for these linkages indicate that sorption occurred by Sb(V) incorporation into the schwertmannite structure via heterovalent Sb(V)-for-Fe(III) substitution. As such, Sb(V) sorption to schwertmannite was not limited by the abundance of surface complexation sites and was strongly resistant to desorption when exposed to 0.1 M PO43-. Sorption of Sb(V) also conferred increased stability to schwertmannite, based on changes in the schwertmannite dissolution rate during extraction with an acidic ammonium oxalate solution. This study provides new insights into Sb(V) sorption to schwertmannite in acid sulfate environments, and highlights the role that schwertmannite can play in immobilizing Sb(V) within its crystal structure.

DOI 10.1016/j.jhazmat.2024.135545
Citations Scopus - 7
2024 Hosseinpour Moghaddam M, Karimian N, Johnston SG, Choppala G, Rastegari M, Burton ED, 'Antimony(V) sorption and coprecipitation with ferrihydrite: An examination of retention mechanisms and the selectivity of commonly-applied extraction procedures', Journal of Hazardous Materials, 480 (2024) [C1]

We investigated the mechanisms that control Sb(V) sorption and coprecipitation with ferrihydrite across a range of Sb(V) loadings, and examined the associated effects on Sb(V) ext... [more]

We investigated the mechanisms that control Sb(V) sorption and coprecipitation with ferrihydrite across a range of Sb(V) loadings, and examined the associated effects on Sb(V) extractability during the commonly-applied 1 M HCl extraction scheme and the BCR and Wenzel sequential extraction schemes. EXAFS spectroscopy reveals that Sb(V) sorption and coprecipitation mainly involved Sb(V) incorporation into the ferrihydrite structure via edge sharing and double-corner sharing between SbO6 and FeO6 octahedra. Large amounts of these linkages partially stabilized ferrihydrite against extraction with 1 M HCl. Negligible (< 0.5 %) ferrihydrite-bound Sb(V) was recovered in the "acid extractable" and "reducible" fractions of the BCR scheme, while 1¿16 % was recovered in the "oxidizable" fraction. As such, the BCR scheme risks ferrihydrite-bound Sb(V) being misidentified as Sb residing mainly in "residual" phases. In contrast, in the Wenzel scheme, almost all sorbed- and coprecipitated-Sb(V) was recovered in the "amorphous hydrous oxide-bound" fraction, with only 0.6¿3.3 % in the "specifically-bound" fraction (consistent with our finding of Sb(V) retention via incorporation into ferrihydrite, as opposed to adsorption by the ferrihydrite surface). Collectively, the results provide new insights into the retention mechanisms and extraction behaviour of ferrihydrite-bound Sb(V), enhancing our ability to assess Sb contamination in soils, sediments and geogenic wastes.

DOI 10.1016/j.jhazmat.2024.136297
Citations Scopus - 2
2024 Rastegari M, Karimian N, Johnston SG, Choppala G, Hosseinpour Moghaddam M, Burton ED, 'Antimony-bearing schwertmannite transformation to goethite: A driver of antimony mobilization in acid mine drainage', Journal of Hazardous Materials, 480 (2024) [C1]

Antimony(V) mobility in acid mine drainage (AMD) is often controlled by sorption and coprecipitation with schwertmannite ¿ a poorly-ordered Fe(III) oxyhydroxysulfate mineral. Howe... [more]

Antimony(V) mobility in acid mine drainage (AMD) is often controlled by sorption and coprecipitation with schwertmannite ¿ a poorly-ordered Fe(III) oxyhydroxysulfate mineral. However, due to its metastable nature, schwertmannite transforms over time to more thermodynamically stable Fe(III) phases, such as goethite. This study examines how transformation of Sb(V)-bearing schwertmannite to goethite impacts Sb(V) mobility, while also assessing the role that Sb(V) may play in stabilizing schwertmannite against such transformation. To address these aims, Sb(V)-free, Sb(V)-sorbed and Sb(V)-coprecipitated schwertmannite were allowed to undergo partial transformation to goethite under acid sulfate conditions. Iron K-edge EXAFS spectroscopy revealed that sorbed and coprecipitated Sb(V) partly stabilized schwertmannite against transformation. The onset of schwertmannite transformation to goethite was found to drive clear mobilization of Sb(V) into solution, regardless of the Sb(V) loading or whether Sb(V) was initially sorbed or coprecipitated with the precursor schwertmannite. This initial phase of Sb(V) mobilization was followed by subsequent solid-phase recapture of the released Sb(V), with Sb K-edge EXAFS spectroscopy revealing that this process involved Sb(V) incorporation into the newly-formed goethite. Our findings show that, although schwertmannite transformation to goethite is partially inhibited by co-existing Sb(V), the initial stage of this transformation process drives significant Sb(V) mobilization in AMD systems.

DOI 10.1016/j.jhazmat.2024.136487
Citations Scopus - 2
2022 Yeasmin M, Lamb D, Choppala G, Rahman MM, 'Selenium Accumulation and Speciation in Chickpea (Cicer arietinum) Impacted by S in Soils: Potential for Biofortification', ACS AGRICULTURAL SCIENCE & TECHNOLOGY, 2, 135-143 (2022) [C1]

Dietary selenium (Se) deficiency is a well-known global problem originating from food crops grown in Se-deficient soil. Agronomic Se biofortification is one of the suitable option... [more]

Dietary selenium (Se) deficiency is a well-known global problem originating from food crops grown in Se-deficient soil. Agronomic Se biofortification is one of the suitable options to minimize Se deficiency. Sulfur (S) is chemically similar to Se, and the role of S on the uptake and transformation of Se in grain has not been resolved. Considering this, our study examines the influence of S on the speciation and accumulation of Se in two chickpea cultivars (Amber and PBA sheamer) grown in Se-deficient soil under glasshouse conditions. Two doses of S (0 and 14 mg kg-1) as sulfate and three doses of Se (0, 1, and 2 mg kg-1) as selenate (SeVI) were used in a randomized factorial design. The addition of SeVI increased the Se content in grain in both cultivars compared to the control treatment. Speciation of Se analysis in grain showed that most (85%) of the Se accumulated in chickpea grain in the organic forms of Se as SeCys and MeSeCys. At 2 mg/kg Se addition, the biomass and grain yield was significantly reduced (P < 0.01), while S addition tended to increase the yield. Inorganic Se was below 15%, primarily as SeVI. PBA Sheamer, a desi type and widely grown chickpea cultivar, showed the most significant proportion of organic Se species, SeCys (57%) and SeMeCys (40%). Application of S contemporarily with Se showed increased SeMeCys production in the grain of PBA Sheamer cultivar. These findings indicated that the accumulation and speciation of Se in chickpea grain was dependent on both Se and S fertilization.

DOI 10.1021/acsagscitech.1c00237
Citations Scopus - 6Web of Science - 4
Co-authors Mahmud Rahman
2022 Choppala G, Lamb D, Aughterson R, Burton ED, 'Tooeleite Transformation and Coupled As(III) Mobilization Are Induced by Fe(II) under Anoxic, Circumneutral Conditions', ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022) [C1]
DOI 10.1021/acs.est.2c02130
Citations Scopus - 8Web of Science - 5
2022 Rastegari M, Karimian N, Johnston SG, Doherty SJ, Hamilton JL, Choppala G, Moghaddam MH, Burton ED, 'Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 56, 17776-17784 (2022) [C1]
DOI 10.1021/acs.est.2c07341
Citations Scopus - 2Web of Science - 21
2022 Choppala G, Karimian N, Burton ED, 'An X-ray absorption spectroscopic study of the Fe(II)-induced transformation of Cr(VI)-substituted schwertmannite', JOURNAL OF HAZARDOUS MATERIALS, 431 (2022) [C1]

The environmental chemistry of Cr is of widespread interest due to the hazardous nature of Cr(VI). Because of similar atomic size and charge, CrVIO42- can substitute for SO42- wit... [more]

The environmental chemistry of Cr is of widespread interest due to the hazardous nature of Cr(VI). Because of similar atomic size and charge, CrVIO42- can substitute for SO42- within schwertmannite - an Fe(III) oxyhydroxysulfate mineral that occurs widely in acidic and sulfate-rich systems. The presence of aqueous Fe(II) can induce transformation of schwertmannite to more stable Fe(III) phases (e.g. goethite) which may potentially impact the behaviour of co-associated Cr(VI). Here, we investigate the Fe(II)-induced transformation of Cr(VI)-substituted schwertmannite as a function of pH (4-8) and the degree of Cr(VI) substitution (0.16¿13 mol% CrVIO42--for-SO42- substitution). Iron K-edge EXAFS spectroscopy revealed that higher levels of Cr(VI) substitution inhibited Fe(II)-induced schwertmannite transformation. Chromium K-edge XANES spectroscopy indicated that this outcome could be partly attributed to consumption of Fe(II) by reaction with Cr(VI), and the resulting formation of a passivating Cr(III)-Fe(III) hydroxide phase which stabilizes schwertmannite at greater levels of Cr(VI) substitution and at higher pH while also decreasing further reduction of structural Cr(VI). Overall, this study enriches our understanding of interactions between hazardous Cr(VI) and schwertmannite in environmental and engineered systems.

DOI 10.1016/j.jhazmat.2022.128580
Citations Scopus - 1Web of Science - 13
2022 Yeasmin M, Lamb D, Choppala G, Rahman MM, 'Impact of Sulfur on Biofortification and Speciation of Selenium in Wheat Grain Grown in Selenium-Deficient Soils', JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION, 22, 3243-3253 (2022) [C1]
DOI 10.1007/s42729-022-00882-0
Citations Scopus - 6Web of Science - 5
Co-authors Mahmud Rahman
2022 Abbasi S, Lamb DT, Choppala G, Burton ED, Megharaj M, 'Antimony speciation, phytochelatin stimulation and toxicity in plants', ENVIRONMENTAL POLLUTION, 305 (2022) [C1]
DOI 10.1016/j.envpol.2022.119305
Citations Scopus - 2Web of Science - 14
Co-authors Megh Mallavarapu
2021 Hoang SA, Lamb D, Seshadri B, Sarkar B, Choppala G, Kirkham MB, Bolan NS, 'Rhizoremediation as a green technology for the remediation of petroleum hydrocarbon-contaminated soils', Journal of Hazardous Materials, 401 (2021) [C1]
DOI 10.1016/j.jhazmat.2020.123282
Citations Scopus - 1Web of Science - 1
Co-authors Balaji Seshadri
2021 Bari ASMF, Lamb D, Choppala G, Seshadri B, Islam MR, Sanderson P, Rahman MM, 'Arsenic bioaccessibility and fractionation in abandoned mine soils from selected sites in New South Wales, Australia and human health risk assessment', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 223 (2021) [C1]
DOI 10.1016/j.ecoenv.2021.112611
Citations Scopus - 2Web of Science - 19
Co-authors Balaji Seshadri, Ravi Naidu, Mdrashidul Islam, Mahmud Rahman
2021 Gerdelidani AF, Towfighi H, Shahbazi K, Lamb DT, Choppala G, Abbasi S, Bari ASMF, Naidu R, Rahman MM, 'Arsenic geochemistry and mineralogy as a function of particle-size in naturally arsenic-enriched soils', Journal of Hazardous Materials, 403 (2021) [C1]
DOI 10.1016/j.jhazmat.2020.123931
Citations Scopus - 5Web of Science - 4
Co-authors Ravi Naidu, Mahmud Rahman
2021 Lamb D, Choppala G, Yeasmin M, Abbasi S, Wang L, Naidu R, Reichman S, McGrath S, 'Are root elongation assays suitable for establishing metallic anion ecotoxicity thresholds?', Journal of Hazardous Materials Letters, 2 (2021) [C1]
DOI 10.1016/j.hazl.2021.100024
Citations Scopus - 3Web of Science - 3
Co-authors Ravi Naidu, Liang Wang
2021 Burton ED, Karimian N, Johnston SG, Schoepfer VA, Choppala G, Lamb D, 'Arsenic-Imposed Effects on Schwertmannite and Jarosite Formation in Acid Mine Drainage and Coupled Impacts on Arsenic Mobility', ACS EARTH AND SPACE CHEMISTRY, 5, 1418-1435 (2021) [C1]
DOI 10.1021/acsearthspacechem.1c00047
Citations Scopus - 5Web of Science - 43
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)
DOI 10.1016/j.hazl.2021.100024
Co-authors Ravi Naidu, Liang Wang
2020 Fazle Bari ASM, Lamb D, Choppala G, Bolan N, Seshadri B, Rahman MA, Rahman MM, 'Geochemical fractionation and mineralogy of metal(loid)s in abandoned mine soils: Insights into arsenic behaviour and implications to remediation', Journal of Hazardous Materials, 399 (2020) [C1]
DOI 10.1016/j.jhazmat.2020.123029
Citations Scopus - 4Web of Science - 4
Co-authors Balaji Seshadri, Mahmud Rahman
2019 Burton ED, Choppala G, Vithana CL, Karimian N, Hockmann K, Johnston SG, 'Chromium(VI) formation via heating of Cr(III)-Fe(III)-(oxy)hydroxides: A pathway for fire-induced soil pollution', CHEMOSPHERE, 222, 440-444 (2019) [C1]
DOI 10.1016/j.chemosphere.2019.01.172
Citations Scopus - 3Web of Science - 23
2019 Burton ED, Choppala G, Karimian N, Johnston SG, 'A new pathway for hexavalent chromium formation in soil: Fire-induced alteration of iron oxides', ENVIRONMENTAL POLLUTION, 247, 618-625 (2019) [C1]
DOI 10.1016/j.envpol.2019.01.094
Citations Scopus - 3Web of Science - 27
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]
DOI 10.1016/j.jenvman.2019.02.122
Citations Scopus - 3Web of Science - 3
Co-authors Ravi Naidu, Balaji Seshadri
2019 Karimian N, Burton ED, Johnston SG, Hockmann K, Choppala G, 'Humic acid impacts antimony partitioning and speciation during iron(II)-induced ferrihydrite transformation', Science of The Total Environment, 683, 399-410 (2019) [C1]
DOI 10.1016/j.scitotenv.2019.05.305
Citations Scopus - 6Web of Science - 5
2018 Choppala G, Kunhikrishnan A, Seshadri B, Park J, Bush R, Bolan N, 'Comparative sorption of chromium species as influenced by amendments in contaminated soils', Journal of Geochemical Exploration (2018) [C1]
DOI 10.1016/j.gexplo.2016.07.012
Citations Scopus - 1Web of Science - 1
Co-authors Balaji Seshadri
2018 Bibi I, Niazi NK, Choppala G, Burton ED, 'Chromium(VI) removal by siderite (FeCO3) in anoxic aqueous solutions: An X-ray absorption spectroscopy investigation', SCIENCE OF THE TOTAL ENVIRONMENT, 640, 1424-1431 (2018) [C1]
DOI 10.1016/j.scitotenv.2018.06.003
Citations Scopus - 6Web of Science - 55
2018 Tripathi N, Choppala G, Singh RS, Hills CD, 'Impact of modified chitosan on pore water bioavailability of zinc in contaminated soils', JOURNAL OF GEOCHEMICAL EXPLORATION, 186, 94-99 (2018) [C1]

The present work examines the utilisation potential of the bio-waste, chitosan for the remediation of soils contaminated with zinc (Zn). The mechanism involved was elucidated via ... [more]

The present work examines the utilisation potential of the bio-waste, chitosan for the remediation of soils contaminated with zinc (Zn). The mechanism involved was elucidated via a study of Zn sorption kinetics on pure and modified chitosan beads, the latter containing molybdate and phosphate compounds. The effect of equilibration time on adsorption was explained with reference to chemical sorption and intra-particle diffusion mechanisms. The findings showed that chitosan acts upon freely dissolved zinc in soil pore water. The use of modified chitosan beads resulted in a significant decrease in Zn bioavailability, which may be attributed to a combination of Zn complexation, the sorbent's high surface area and cation exchange capacity (CEC). This study provides an insight into issues associated with zinc contaminated soils and the amelioration of nutrient-deficient soil through modified chitosan amendments. Capsule abstract Modified chitosan has potential to remediate Zn-contaminated soil. The bioavailability of zinc in the pore water of contaminated soils decreased upon the application of chitosan beads.

DOI 10.1016/j.gexplo.2017.12.005
Citations Scopus - 2Web of Science - 2
2018 Choppala G, Burton ED, 'Chromium(III) substitution inhibits the Fe(II)-accelerated transformation of schwertmannite', PLOS ONE, 13 (2018) [C1]
DOI 10.1371/journal.pone.0208355
Citations Scopus - 2Web of Science - 25
2018 Choppala G, Moon E, Bush R, Bolan N, Carroll N, 'Dissolution and redistribution of trace elements and nutrients during dredging of iron monosulfide enriched sediments', CHEMOSPHERE, 201, 380-387 (2018) [C1]

The increased use of estuarine waters for commercial and recreational activities is one consequence of urbanisation. Western Australia&apos;s Peel-Harvey Estuary highlights the im... [more]

The increased use of estuarine waters for commercial and recreational activities is one consequence of urbanisation. Western Australia's Peel-Harvey Estuary highlights the impacts of urbanisation, with a rapidly developing boating industry and periodic dredging activity. The aim of this research is to evaluate the potential mobility of nutrients and trace elements during dredging, and the influence of flocculation on iron and sulfur partitioning in iron monosulfide enriched sediments. Our findings indicate a short-term increase in nitrate, phosphate and ammonium, during dredging through the resuspension of sediments. However, no increase in metal mobilisation during dredging was observed except copper (Cu) and zinc (Zn). Flocculant addition increased the release of nutrients, zinc (Zn) and arsenic (As) from sediments, had no effect on acid volatile sulfides and pyritic sulfur, but corresponded with an initial sharp rise in elemental sulfur concentrations. The run-off water from geofabric bags should be treated to decrease the concentrations of Zn and As to their background levels before releases into the estuary. Long-term impact of dredging on organic matter mineralisation and its subsequent effect on nutrients and trace elements dynamics needs further investigation.

DOI 10.1016/j.chemosphere.2018.01.164
Citations Scopus - 1Web of Science - 16
2018 Qi F, Lamb D, Naidu R, Bolan NS, Yan Y, Ok YS, Rahman MM, Choppala G, 'Cadmium solubility and bioavailability in soils amended with acidic and neutral biochar', SCIENCE OF THE TOTAL ENVIRONMENT, 610, 1457-1466 (2018) [C1]
DOI 10.1016/j.scitotenv.2017.08.228
Citations Scopus - 9Web of Science - 78
Co-authors Ravi Naidu, Mahmud Rahman
2017 Tripathi N, Choppala G, Singh RS, 'Evaluation of modified chitosan for remediation of zinc contaminated soils', JOURNAL OF GEOCHEMICAL EXPLORATION, 182, 180-184 (2017) [C1]
DOI 10.1016/j.gexplo.2016.08.011
Citations Scopus - 2Web of Science - 24
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]
DOI 10.1016/j.scitotenv.2017.02.064
Citations Scopus - 18Web of Science - 16
Co-authors Ravi Naidu
2017 Seshadri B, Bolan NS, Choppala G, Kunhikrishnan A, Sanderson P, Wang H, Currie LD, Tsang DCW, Ok YS, Kim G, 'Potential value of phosphate compounds in enhancing immobilization and reducing bioavailability of mixed heavy metal contaminants in shooting range soil', CHEMOSPHERE, 184, 197-206 (2017) [C1]

Shooting range soils contain mixed heavy metal contaminants including lead (Pb), cadmium (Cd), and zinc (Zn). Phosphate (P) compounds have been used to immobilize these metals, pa... [more]

Shooting range soils contain mixed heavy metal contaminants including lead (Pb), cadmium (Cd), and zinc (Zn). Phosphate (P) compounds have been used to immobilize these metals, particularly Pb, thereby reducing their bioavailability. However, research on immobilization of Pb's co-contaminants showed the relative importance of soluble and insoluble P compounds, which is critical in evaluating the overall success of in situ stabilization practice in the sustainable remediation of mixed heavy metal contaminated soils. Soluble synthetic P fertilizer (diammonium phosphate; DAP) and reactive (Sechura; SPR) and unreactive (Christmas Island; CPR) natural phosphate rocks (PR) were tested for Cd, Pb and Zn immobilization and later their mobility and bioavailability in a shooting range soil. The addition of P compounds resulted in the immobilization of Cd, Pb and Zn by 1.56¿76.2%, 3.21¿83.56%, and 2.31¿74.6%, respectively. The reactive SPR significantly reduced Cd, Pb and Zn leaching while soluble DAP increased their leachate concentrations. The SPR reduced the bioaccumulation of Cd, Pb and Zn in earthworms by 7.13¿23.4% and 14.3¿54.6% in comparison with earthworms in the DAP and control treatment, respectively. Bioaccessible Cd, Pb and Zn concentrations as determined using a simplified bioaccessibility extraction test showed higher long-term stability of P-immobilized Pb and Zn than Cd. The differential effect of P-induced immobilization between P compounds and metals is due to the variation in the solubility characteristics of P compounds and nature of metal phosphate compounds formed. Therefore, Pb and Zn immobilization by P compounds is an effective long-term remediation strategy for mixed heavy metal contaminated soils.

DOI 10.1016/j.chemosphere.2017.05.172
Citations Scopus - 1Web of Science - 124
Co-authors Balaji Seshadri
2017 Kunhikrishnan A, Choppala G, Seshadri B, Wijesekara H, Bolan NS, Mbene K, Kim W-I, 'Impact of wastewater derived dissolved organic carbon on reduction, mobility, and bioavailability of As(V) and Cr(VI) in contaminated soils', JOURNAL OF ENVIRONMENTAL MANAGEMENT, 186, 183-191 (2017) [C1]
DOI 10.1016/j.jenvman.2016.08.020
Citations Scopus - 4Web of Science - 36
Co-authors Balaji Seshadri
2017 Choppala G, Bush R, Moon E, Ward N, Wang Z, Bolan N, Sullivan L, 'Oxidative transformation of iron monosulfides and pyrite in estuarine sediments: Implications for trace metals mobilisation', Journal of Environmental Management, 186, 158-166 (2017) [C1]
DOI 10.1016/j.jenvman.2016.06.062
Citations Scopus - 2Web of Science - 1
Co-authors Zhaohui Wang
2017 Bolan S, Kunhikrishnan A, Seshadri B, Choppala G, Naidu R, Bolan NS, Ok YS, Zhang M, Li C-G, Li F, Noller B, Kirkham MB, 'Sources, distribution, bioavailability, toxicity, and risk assessment of heavy metal(loid)s in complementary medicines', ENVIRONMENT INTERNATIONAL, 108, 103-118 (2017) [C1]
DOI 10.1016/j.envint.2017.08.005
Citations Scopus - 9Web of Science - 70
Co-authors Balaji Seshadri, Ravi Naidu
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]
DOI 10.1021/acs.est.6b03195
Citations Scopus - 1Web of Science - 16
Co-authors Ravi Naidu, Liang Wang, Mahmud Rahman, Megh Mallavarapu
2016 Mandal S, Sarkar B, Bolan N, Novak J, Ok YS, Van Zwieten L, Singh BP, Kirkham MB, Choppala G, Spokas K, Naidu R, '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.

DOI 10.1080/10643389.2016.1239975
Citations Scopus - 9Web of Science - 80
Co-authors Ravi Naidu
2016 Choppala RA, 'Differential effect of biochar upon reduction-induced mobility and bioavailability of arsenate and chromate', Chemosphere, 144, 374-381 (2016) [C1]

Heavy metals such as chromium (Cr) and arsenic (As) occur in ionic form in soil, with chromate [Cr(VI)] and arsenate As(V) being the most pre-dominant forms. The application of bi... [more]

Heavy metals such as chromium (Cr) and arsenic (As) occur in ionic form in soil, with chromate [Cr(VI)] and arsenate As(V) being the most pre-dominant forms. The application of biochar to Cr(VI) and As(V) spiked and field contaminated soils was evaluated on the reduction processes [(Cr(VI) to Cr(III)] and [As(V) to As(III))], and subsequent mobility and bioavailability of both As(V) and Cr(VI). The assays used in this study included leaching, soil microbial activity and XPS techniques. The reduction rate of As(V) was lower than that of Cr(VI) with and without biochar addition, however, supplementation with biochar enhanced the reduction process of As(V). Leaching experiments indicated Cr(VI) was more mobile than As(V). Addition of biochar reversed the effect by reducing the mobility of Cr and increasing that of As. The presence of Cr and As in both spiked and contaminated soils reduced microbial activity, but with the addition of biochar to these soils, the microbial activity increased in the Cr(VI) contaminated soils, while it was further decreased with As(V) contaminated soils. The addition of biochar was effective in mitigating Cr toxicity by reducing Cr(VI) to Cr(III). In contrast, the conversion process of As(V) to As(III) hastened by biochar was not favourable, as As(III) is more toxic in soils. Overall, the presence of functional groups on biochar promotes reduction by providing the electrons required for reduction processes to occur as determined by XPS data.

DOI 10.1016/j.chemosphere.2015.08.043
Citations Scopus - 1Web of Science - 1
2016 Tripathi N, Choppala G, Singh RS, Srivastava P, Seshadri B, 'Sorption kinetics of zinc and nickel on modified chitosan', ENVIRONMENTAL MONITORING AND ASSESSMENT, 188 (2016) [C1]
DOI 10.1007/s10661-016-5499-5
Citations Scopus - 14Web of Science - 12
Co-authors Balaji Seshadri
2015 Choppala G, Bolan N, Kunhikrishnan A, Skinner W, Seshadri B, 'Concomitant reduction and immobilization of chromium in relation to its bioavailability in soils', Environmental Science and Pollution Research, 22, 8969-8978 (2015) [C1]
DOI 10.1007/s11356-013-1653-6
Citations Scopus - 2Web of Science - 6
Co-authors Balaji Seshadri
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]
DOI 10.1080/10643389.2012.728823
Citations Scopus - 57Web of Science - 40
Co-authors Ravi Naidu
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]
DOI 10.1007/s11270-013-1777-9
Citations Scopus - 6Web of Science - 4
Co-authors Ravi Naidu, Balaji Seshadri
2014 Choppala G, Saifullah , Bolan N, Bibi S, Iqbal M, Rengel Z, Kunhikrishnan A, Ashwath N, Ok YS, 'Cellular Mechanisms in Higher Plants Governing Tolerance to Cadmium Toxicity', Critical Reviews in Plant Sciences, 33, 374-391 (2014) [C1]
DOI 10.1080/07352689.2014.903747
Citations Scopus - 3Web of Science - 1
2013 Choppala G, Bolan N, Lamb D, Kunhikrishnan A, 'Comparative sorption and mobility of Cr(III) and Cr(VI) species in a range of soils: Implications to bioavailability topical collection on remediation of site contamination', Water, Air, and Soil Pollution, 224 (2013) [C1]

The sorption of chromium (Cr) species to soil has become the focus of research as it dictates the bioavailability and also the magnitude of toxicity of Cr. The sorption of two env... [more]

The sorption of chromium (Cr) species to soil has become the focus of research as it dictates the bioavailability and also the magnitude of toxicity of Cr. The sorption of two environmentally important Cr species [Cr(III) and Cr(VI)] was examined using batch sorption, and the data were fitted to Langmuir and Freundlich adsorption isotherms. The effects of soil properties such as pH, CEC, organic matter (OM), clay, water-extractable SO42- and PO43-, surface charge, and different iron (Fe) fractions of 12 different Australian representative soils on the sorption, and mobility of Cr(III) and Cr(VI) were examined. The amount of sorption as shown by K f was higher for Cr(III) than Cr(VI) in all tested soils. Further, the amount of Cr(III) sorbed increased with an increase in pH, CEC, clay, and OM of soils. Conversely, the chemical properties of soil such as positive charge and Fe (crystalline) had a noticeable influence on the sorption of Cr(VI). Desorption of Cr(VI) occurred rapidly and was greater than desorption of Cr(III) in soils. The mobility of Cr species as estimated by the retardation factor was higher for Cr(VI) than for Cr(III) in all tested soils. These results concurred with the results from leaching experiments which showed higher leaching of Cr(VI) than Cr(III) in both acidic and alkaline soils indicating the higher mobility of Cr(VI) in a wide range of soils. This study demonstrated that Cr(VI) is more mobile and will be bioavailable in soils regardless of soil properties and if not remediated may eventually pose a severe threat to biota. © 2013 Springer Science+Business Media Dordrecht.

DOI 10.1007/s11270-013-1699-6
Citations Scopus - 5Web of Science - 5
2013 Bolan N, Mahimairaja S, Kunhikrishnan A, Choppala G, 'Phosphorus-arsenic interactions in variable-charge soils in relation to arsenic mobility and bioavailability', Science of the Total Environment, 463-464, 1154-1162 (2013) [C1]
DOI 10.1016/j.scitotenv.2013.04.016
Citations Scopus - 1Web of Science - 1
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)
DOI 10.1007/978-1-4614-6470-9_1
Citations Scopus - 9Web of Science - 64
Co-authors Ravi Naidu
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]
DOI 10.1016/j.jhazmat.2013.04.051
Citations Scopus - 1Web of Science - 6
Co-authors Ravi Naidu, Balaji Seshadri
2013 Choppala G, Bolan N, Seshadri B, 'Chemodynamics of chromium reduction in soils: Implications to bioavailability', Journal of Hazardous Materials, 261, 718-724 (2013) [C1]
DOI 10.1016/j.jhazmat.2013.03.040
Citations Scopus - 4Web of Science - 4
Co-authors Balaji Seshadri
2013 Park JH, Choppala G, Lee SJ, Bolan N, Chung JW, Edraki M, 'Comparative sorption of Pb and Cd by biochars and its implication for metal immobilization in soils', Water, Air, and Soil Pollution, 224 1-12 (2013)

Biochar has great potential as a soil amendment to immobilize heavymetals, thereby reducing their bioavailability. In this study, biochars derived from chicken manure and green wa... [more]

Biochar has great potential as a soil amendment to immobilize heavymetals, thereby reducing their bioavailability. In this study, biochars derived from chicken manure and green waste were compared with commercial activated carbon (AC) and laboratory produced black carbon (BC) for the sorption of Pb and Cd. Sorption kinetics and equilibrium sorption isotherms for Pb and Cd were obtained for the char materials and the data were fitted to kinetic and sorption isotherm models.. Chicken manure-derived biochar (CM) showed the highest sorption capacity for both Pb and Cd, and the Pb sorption by biochars was higher than the Cd sorption because of the precipitation of Pb with various ions released from the biochars such as carbonate, phosphate, and sulfate. The sorption data for both Pb and Cd were better represented by the pseudo-second order kinetic model than the pseudo-first order kinetic model, which indicates chemical sorption between biochar and metals. For the isotherm studies, char materials was mixed with various amount of Pb or Cd solutions and the remaining metal concentration was measured. The equilibrium sorption data followed a Langmuir isotherm with a maximum sorption capacity of 6.8-11 and 1.7-8.0 mg/g by biochars for Pb and Cd, respectively. Furthermore, CM immobilized Pb and Cd up to 93.5 and 88.4 %, respectively, while BC was not effective in the immobilization of Pb in soil. Overall, the sorption experiments in solution and the immobilization experiment in soil showed that biochars are more effective than AC in the sorption of Pb and Cd, and that they have the potential to be used as a soil amendment to remediate metal-contaminated soil. © Springer Science+Business Media Dordrecht 2013.

DOI 10.1007/s11270-013-1711-1
Citations Scopus - 19
2013 Park JH, Choppala G, Lee SJ, Bolan N, Chung JW, Edraki M, 'Comparative sorption of Pb and Cd by biochars and its implication for metal immobilization in soils topical collection on remediation of site contamination', Water, Air, and Soil Pollution, 224 (2013) [C1]
DOI 10.1007/s11270-013-1711-1
Citations Scopus - 1Web of Science - 1
2013 Panneerselvam P, Choppala G, Kunhikrishnan A, Bolan N, 'Potential of novel bacterial consortium for the remediation of chromium contamination', Water, Air, and Soil Pollution, 224 (2013) [C1]
DOI 10.1007/s11270-013-1716-9
Citations Scopus - 2Web of Science - 1
2012 Bolan NS, Kunhikrishnan A, Choppala GK, Thangarajan R, Chung JW, 'Stabilization of carbon in composts and biochars in relation to carbon sequestration and soil fertility', Science of the Total Environment, 424, 264-270 (2012) [C1]
DOI 10.1016/j.scitotenv.2012.02.061
Citations Scopus - 1Web of Science - 1
2012 Choppala GK, Bolan NS, Megharaj M, Chen Z, Naidu R, 'The Infl uence of Biochar and Black Carbon on Reduction and Bioavailability of Chromate in Soils', Journal of Environmental Quality, 41, 1175-1184 (2012) [C1]
DOI 10.2134/jeq2011.0145
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu, Megh Mallavarapu
2011 Park JH, Choppala GK, Bolan NS, Chung JW, Chuasavathi T, 'Biochar reduces the bioavailability and phytotoxicity of heavy metals', Plant and Soil, 348, 439-451 (2011) [C1]
DOI 10.1007/s11104-011-0948-y
Citations Scopus - 1Web of Science - 8
2011 Park JH, Lamb D, Paneerselvam P, Choppala G, Bolan N, Chung JW, 'Role of organic amendments on enhanced bioremediation of heavy metal(loid) contaminated soils', Journal of Hazardous Materials, 185, 549-574 (2011) [C1]

As land application becomes one of the important waste utilization and disposal practices, soil is increasingly being seen as a major source of metal(loid)s reaching food chain, m... [more]

As land application becomes one of the important waste utilization and disposal practices, soil is increasingly being seen as a major source of metal(loid)s reaching food chain, mainly through plant uptake and animal transfer. With greater public awareness of the implications of contaminated soils on human and animal health there has been increasing interest in developing technologies to remediate contaminated sites. Bioremediation is a natural process which relies on soil microorganisms and higher plants to alter metal(loid) bioavailability and can be enhanced by addition of organic amendments to soils. Large quantities of organic amendments, such as manure compost, biosolid and municipal solid wastes are used as a source of nutrients and also as a conditioner to improve the physical properties and fertility of soils. These organic amendments that are low in metal(loid)s can be used as a sink for reducing the bioavailability of metal(loid)s in contaminated soils and sediments through their effect on the adsorption, complexation, reduction and volatilization of metal(loid)s. This review examines the mechanisms for the enhanced bioremediation of metal(loid)s by organic amendments and discusses the practical implications in relation to sequestration and bioavailability of metal(loid)s in soils. © 2010 Elsevier B.V.

DOI 10.1016/j.jhazmat.2010.09.082
Citations Scopus - 8Web of Science - 6
Show 50 more journal articles

Review (1 outputs)

Year Citation Altmetrics Link
2013 Choppala G, Bolan N, Park JH, 'Chromium Contamination and Its Risk Management in Complex Environmental Settings', 120, 129-172 (2013) [B1]
DOI 10.1016/B978-0-12-407686-0.00002-6
Citations Scopus - 1Web of Science - 1
Edit

Grants and Funding

Summary

Number of grants 17
Total funding $2,982,102

Click on a grant title below to expand the full details for that specific grant.


20231 grants / $979,840

Evaluation of agronomic benefits of biosolids biochar$979,840

Funding body: CRC for High Performance Soils

Funding body CRC for High Performance Soils
Project Team Professor Ravi Naidu, Professor Megh Mallavarapu, Doctor Yanju Liu, Doctor Girish Choppala, Aravind Surapaneni, Dr Lukas Van Zwieten, Mr Bret Ryan, Professor Ravi Naidu
Scheme Major Investment Round
Role Investigator
Funding Start 2023
Funding Finish 2027
GNo G2300116
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

20222 grants / $847,957

The effect of bushfire on the structural characteristics of asbestos$717,957

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Doctor Girish Choppala, Professor Ravi Naidu, Doctor Liang Wang
Scheme Research Grant
Role Lead
Funding Start 2022
Funding Finish 2024
GNo G2200274
Type Of Funding C3100 – Aust For Profit
Category 3100
UON Y

Reconciling carbon sequestration with fertiliser value of biowastes in farming systems through nanostabilisation of biowastes.$130,000

Funding body: CRC for High Performance Soils

Funding body CRC for High Performance Soils
Project Team Professor Ajayan Vinu, Doctor Girish Choppala, Dr Lukas Van Zwieten, Professor Edward Burton, Mr Vibin Perumalsamy, Professor Jiabao Yi
Scheme PhD Scholarship
Role Investigator
Funding Start 2022
Funding Finish 2024
GNo G2200119
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

20215 grants / $662,039

The value of organic amendments in unlocking soil nutrients and improving nutrient use efficiency$424,151

Funding body: CRC for High Performance Soils

Funding body CRC for High Performance Soils
Project Team Doctor Balaji Seshadri, Professor Ravi Naidu, Professor Ravi Naidu, Professor Nanthi Bolan, Doctor Girish Choppala, John Bennett, Doctor Dane Lamb, Doctor Girish Choppala, Ms Diana Fear, Doctor Anitha Kunhikrishnan, Helen McMillan, Aravind Surapaneni, Dr Amanda Schapel, Diana Fear, Mr Angus Johnston, Lawrence Di Bella, Lawrence Di Bella, Amanda Schapel, Angus Johnston, Dr Surinder Saggar, Dr Surinder Saggar
Scheme Major Investment Round
Role Investigator
Funding Start 2021
Funding Finish 2023
GNo G2000156
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

Transformations of antimony at organic carbon solid-solution interfaces in abandoned mining environments$98,352

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Dane Lamb, Girish Choppala, Edward D Burton, Md. Aminur Rahman

Scheme Australian Synchrotron Research Program
Role Investigator
Funding Start 2021
Funding Finish 2021
GNo
Type Of Funding C1500 - Aust Competitive - Commonwealth Other
Category 1500
UON N

Using X-ray absorption spectroscopy to resolve the reductive transformation of tooeleite. Part 1: As K-edge XAS$65,568

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Girish Choppala, Dane Lamb, Edward D Burton

Scheme Australian Synchrotron Research Program
Role Lead
Funding Start 2021
Funding Finish 2021
GNo
Type Of Funding C1500 - Aust Competitive - Commonwealth Other
Category 1500
UON N

Using X-ray absorption spectroscopy to resolve the reductive transformation of tooeleite. Part 2: Fe K-edge XAS $65,568

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Girish Choppala, Dane Lamb, Edward D Burton

Scheme Australian Synchrotron Research Program
Role Lead
Funding Start 2021
Funding Finish 2021
GNo
Type Of Funding C1500 - Aust Competitive - Commonwealth Other
Category 1500
UON N

Resolving the secondary mineralogical pathways and products of tooeleite during the Fe(II) induced reductive transformation in mine sites: TEM investigation $8,400

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Rob Aughterson, Girish Choppala, Dane Lamb, Edward D Burton

Scheme Access to Major Research Facilities Program
Role Investigator
Funding Start 2021
Funding Finish 2021
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

20203 grants / $123,152

The environmental stability of tooeleite in mining-impacted systems: Part 1. As K-edge XAS$98,352

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Girish Choppala, Dane Lamb, Edward D Burton

Scheme Australian Synchrotron Research Program
Role Lead
Funding Start 2020
Funding Finish 2020
GNo
Type Of Funding C1500 - Aust Competitive - Commonwealth Other
Category 1500
UON N

X-ray spectroscopic investigation on phosphorus interactions with rare earth elements. Phosphorus K-edge XAS$16,400

Funding body: NSRRC (National Synchrotron Radiation Research Centre)

Funding body NSRRC (National Synchrotron Radiation Research Centre)
Project Team

Girish Choppala, Dane Lamb, Anitha Kunhikrishnan, Andrew Rose

Scheme Synchrotron Beamtime
Role Lead
Funding Start 2020
Funding Finish 2020
GNo
Type Of Funding International - Competitive
Category 3IFA
UON N

Resolving tooeleite's secondary mineralogical transformation pathways during oxidative dissolution in mine sites$8,400

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Rob Aughterson, Girish Choppala, Dane Lamb, Fazle Bari

Scheme Access to Major Research Facilities Program
Role Investigator
Funding Start 2020
Funding Finish 2020
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

20182 grants / $131,136

: Closer look at geochemical behaviour of antimony in iron and natural organic matter-rich wetlands: 2. Iron K-edge XAS$65,568

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

NIloofar Karimian, Edward D Burton, Scott Johnston, Girish Choppala

Scheme Australian Synchrotron Research Program
Role Investigator
Funding Start 2018
Funding Finish 2018
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

Closer look at geochemical behaviour of antimony in iron and natural organic matter-rich wetlands: 1. Antimony K-edge XAS$65,568

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Niloofar Karimian, Edward D Burton, Scott Johnston, Girish Choppala

Scheme Australian Synchrotron Research Program
Role Investigator
Funding Start 2018
Funding Finish 2018
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

20173 grants / $229,578

An integrated Fe and Cr K-edge XAS study of the Fe(II)-catalysed transformation of Cr(VI)-incorporated schwertmannite$98,352

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Girish Choppala, Edward D Burton, Niloofar Karimain

Scheme Australian Synchrotron Research Program
Role Lead
Funding Start 2017
Funding Finish 2017
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

Competitive sorption and redox transformations of chromate and arsenite on schwertmannite: an integrated As, Cr and Fe K-edge XAS study’ $65,658

Funding body: NSRRC (National Synchrotron Radiation Research Centre)

Funding body NSRRC (National Synchrotron Radiation Research Centre)
Project Team

Girish Choppala, Edward Burton

Scheme Synchrotron Beamtime
Role Lead
Funding Start 2017
Funding Finish 2017
GNo
Type Of Funding International - Competitive
Category 3IFA
UON N

Using XANES spectroscopy to quantify Cr(VI) formation during thermal transformation of Cr(III)-Fe(III) (oxy)hydroxides$65,568

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Edward Burton, Girish Choppala

Scheme Australian Synchrotron Research Program
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

20161 grants / $8,400

Resolving synergistic effect of mackinawite on oxidative dynamics of nano-pyrite$8,400

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Girish Choppala, Edward D Burton

Scheme Access to Major Research Facilities Program
Role Lead
Funding Start 2016
Funding Finish 2016
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N
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Research Supervision

Number of supervisions

Completed0
Current2

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2023 PhD Legacy cadmium-phosphate interaction in long-term fertilized soil PhD (Environment Remediation), College of Engineering, Science and Environment, The University of Newcastle Co-Supervisor
2021 PhD Micronutrient Dynamics Under Climate Change: The Atmosphere-Plant-Soil Nexus PhD (Environment Remediation), College of Engineering, Science and Environment, The University of Newcastle Co-Supervisor
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Research Collaborations

The map is a representation of a researchers co-authorship with collaborators across the globe. The map displays the number of publications against a country, where there is at least one co-author based in that country. Data is sourced from the University of Newcastle research publication management system (NURO) and may not fully represent the authors complete body of work.

Country Count of Publications
Australia 61
Korea, Republic of 24
Bangladesh 6
China 6
United Kingdom 6
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Dr Girish Choppala

Position

Research Associate
School of Environmental and Life Sciences
College of Engineering, Science and Environment

Contact Details

Email girish.choppala@newcastle.edu.au
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