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Research Themes > Biogeochemistry of Arsenic

Biogeochemistry of Arsenic and Trace Metals


      

    Through our research activities on arsenic in the environment, we have made studies (with Prof Dave Polya, also of SEAES) of solid phase and aqueous phase speciation of this toxic metalloid using XAS and in house developed IC-ICP-MS respectively,with application to the bigoeochemical behaviour of arsenic in groundwaters, geothermal areas, acid mine drainage and polluted urban waterways. We have also used microbiological and molecular ecology techniques to make pioneering studies on the microorganisms involved in arsenic biotransformations, mobilization and immobilization in a range of aquifer systems, most notably those in W. Bengal and Cambodia. Recent work has moved towards the use of metagenomics techniques to improve our understanding of these processes, and also (with Drs Rich Pancost and Bart van Dongen) the role of organics in promoting microbially-mediated As release from sediments. This work has been supported by major grants from NERC and the EU.

Recent Publications



Hery, M., Van Dongen, B.E., Gill, F., Mondal, D., Vaughan, D.J., Pancost, R.D., Polya, D.A. and Lloyd, J.R. (2010) Arsenic release and attenuation in low organic carbon aquifer sediments from West Bengal. Geobiology 8, 155–168 DOI: 10.1111/j.1472-4669.2010.00233.x
Gupta, S. Prakash, R. Prakash, N.T., Pearce, C.; Pattrick, R. Hery, M., Lloyd, J. (2010) Selenium Mobilization by Pseudomonas aeruginosa (SNT-SG1) Isolated from Seleniferous Soils from India. Geomicrobiology Journal 27 1 35 – 42 DOI; 10.1080/01490450903232173
Reyes, C., Lloyd, J.R. and Saltikov, C.W. (2009) Geomicrobiology of Iron and Arsenic In Anoxic Sediments; Biogeochemical Processes That Release Arsenic. In “Arsenic Contamination in Groundwater: Mechanism, Analysis, and Remediation” Editor S. Ahuja Wiley InterScience pp 123-146 10.1002/9780470371046
Prakash, N.T., Neetu Sharma, Ranjana Prakash, Kuldeep K.Raina, Jonathan Fellowes, Carolyn I Pearce, Jonathan R. Lloyd, Richard A.D. Pattrick (2009) Aerobic microbial manufacture of nanoscale selenium: exploiting nature’s bio-nanomineralization potential. Biotechnology Letters 31 12 1857-1862 DOI 10.1007/s10529-009-0096-0
Rowland, H.A.L., Boothman, C., Pancost, R.., Gault, A.G., Polya, D.A. and Lloyd, J.R. (2009) Microbiological transformations of petroleum and metals leading to arsenic release from West Bengal aquifer sediments. Journal of Environmental Quality 38 1598-1607
Handley, K.M., Hery, M. and Lloyd, J.R. (2009) Marinobacter santoriniensissp. nov., a novel arsenate-respiring and arsenite-oxidizing bacterium isolated from hydrothermal sediment. International Journal of Systematic and Evolutionary Microbiology 59(Pt 4): 886-92
Héry, M., A.G. Gault, H.A. L. Rowland, Gavin Lear, D.A. Polya and JR. Lloyd (2008) Molecular and cultivation-dependent analysis of metal-reducing bacteria implicated in arsenic mobilisation in South East Asian aquifers. Applied Geochemistry 23 3215–3223 DOI: 10.1016/j.apgeochem.2008.07.003
Corkhill, C.L., Wincott, P.L., Lloyd, J.R. and Vaughan, D.J. (2008) The oxidative dissolution of arsenopyrite (FeAsS) and enargite (Cu3AsS4) by Leptospirillum ferrooxidans. Geochimica et Cosmochimica Acta 72 5616-5633
Pederick, R.L., Gault, A.G. , Charnock, J.M., Polya, D.A., and Lloyd, J.R. (2007) Probing the Biogeochemistry of Arsenic: Response of Two Contrasting Aquifer Sediments from Cambodia to Stimulation by Arsenate and Ferric Iron. Environmental Science & Health 42, 1763–1774
Rowland, H.A.L., R.L. Pederick, D.A. Polya, R.D. Pancost, B.E. van Dongen, A.G. Gault, D.J. Vaughan, C. Bryant, B. Anderson and J.R. Lloyd (2007) Organic matter as a critical control in arsenic contamination of drinking water from shallow aquifers. Geobiology 5 281-292
Patel, P.C. Goulhen, F., Boothman, C., Gault, A.G., Kalia, K. and Lloyd, J.R. (2007) Arsenate detoxification in a Pseudomonad hypertolerant to arsenic. Archive for Microbiology 187 171-183
Lear, G., Song, B., Gault, A.G., Polya, D.A. and J.R. Lloyd (2007) Molecular Analysis of Arsenate-Reducing Bacteria within Cambodian Sediments Following Amendment with Acetate. Applied and Environmental Microbiology 731041-1048
Ahmed, M. F., S. Ahuja, M. Alauddin, S. J. Hug, J. R. Lloyd, A. Pfaff, T. Pichler, C. Saltikov, M. Stute, and A. v. Geen. (2006). Ensuring Safe Drinking Water in Bangladesh. Science 314 1687 - 1688.
Coker, V.S., A. G. Gault, C. I. Pearce,, G. van der Laan, N. D. Telling, J. M. Charnock,, D. A. Polya, J. R. Lloyd (2006) XAS and XMCD evidence for species dependant partitioning of arsenic during microbial reduction of ferrihydrite to magnetite: implications for arsenic mobilization in reducing aquifers. Environmental Science and Technology 40 7745-7750
Rowland, H.A. et al. (2006) Characterisation of organic matter in a shallow, reducing, arsenic-rich aquifer, West Bengal. Applied Geochemistry 37 1101-1114
Lloyd, J.R. and Oremland, R.S (2006) Microbial transformations of arsenic in the environment; from soda lakes to aquifers. Elements 2 85-90
Islam, F.S., Pederick, R.L, Gault, A.G., Adams, L.K., Polya, D.A., Charnock, J.M. and Lloyd, J.R. (2005) Interactions between the Fe(III)-reducing bacterium Geobacter sulfurreducens and arsenate, and capture of the metalloid by biogenic Fe(II). Applied and Environmental Microbiology 71 8642-8648
Gault, A.G., F. S. Islam, D. A. Polya, J. M. Charnock, C. Boothman, D. Chatterjee and J. R. Lloyd (2005) Microcosm depth profiles of arsenic release in an arsenic contaminated aquifer. Min. Mag. 69 855-863
Islam, F.S., Gault, A.G., Boothman, C., Polya, D.A., Charnock, J.M., Chatterjee, D. and Lloyd, J.R. (2004) Role of metal-reducing bacteria in arsenic release from Bengal Delta sediments. Nature 430 68-71

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