Probing the biogeochemistry of arsenic: response of two contrasting aquifer sediments from Cambodia to stimulation by arsenate and ferric iron.

Probing the biogeochemistry of arsenic: response of two contrasting aquifer sediments from Cambodia to stimulation by arsenate and ferric iron. Research Abstract Details 

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Probing the biogeochemistry of arsenic: response of two contrasting aquifer sediments from Cambodia to stimulation by arsenate and ferric iron. Abstract Text:

R L Pederick,A G Gault,J M Charnock,D A Polya,J R Lloyd,

Many millions of people worldwide are at risk of severe poisoning through exposure to groundwater contaminated with sediment-derived arsenic. An ever-increasing body of work is reinforcing the link between microbially-mediated redox cycling in aquifer sediments and the mobilisation of sorbed As(V) into groundwaters as the potentially more mobile and toxic As(III) anion. However, to date, few studies have examined the biogeochemical cycling of Fe and As species by microbes indigenous to Cambodian sediments. In this study two contrasting sediments, taken from a shallow As-rich reducing aquifer in the Kien Svay district of Cambodia, were used in a laboratory microcosm study. We present evidence to show that microbes present in these sediments are able to reduce Fe(III) and As(V) when provided with an electron donor, and that the two sediments respond differently to stimulation with Fe(III) and As(V). Shifts in the community composition of the two sediments after stimulation with As(V) suggest a potential role for members of the beta-Proteobacteria in As(V) reduction, a phylogenetic grouping known to contain microorganisms capable of As(III) oxidation, but not previously implicated in As(V) reduction. PCR-based analysis of the sediment microbial DNA using primers specific to the arrA gene, (a gene essential for microbial As(V) respiration), indicates the presence of microorganisms capable of dissimilatory As(V) reduction.

Probing the biogeochemistry of arsenic: response of two contrasting aquifer sediments from Cambodia to stimulation by arsenate and ferric iron. Publishing Authors By Initials

RL Pederick,AG Gault,JM Charnock,DA Polya,JR Lloyd,

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Probing the biogeochemistry of arsenic: response of two contrasting aquifer sediments from Cambodia to stimulation by arsenate and ferric iron. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of environmental science and health. Part

VOLUME: 42

Page Numbers: 1763-74

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ISSN: 1093-4529

DAY: 22

MONTH: Oct

YEAR: 2007

Probing the biogeochemistry of arsenic: response of two contrasting aquifer sediments from Cambodia to stimulation by arsenate and ferric iron. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Probing the biogeochemistry of arsenic: response of two contrasting aquifer sediments from Cambodia to stimulation by arsenate and ferric iron.

AFFILIATION: School of Earth, Atmospheric and Environmental Sciences & Williamson Research Centre for Molecular Environmental Science, University of Manchester, UK.

Country: United States

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MEDLINETA: J Environ Sci Health A Tox Haz

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