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Mineralogical Magazine; October 2005; v. 69; no. 5; p. 855-863; DOI: 10.1180/0026461056950293
© 2005 Mineralogical Society of Great Britain and Ireland
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Microcosm depth profiles of arsenic release in a shallow aquifer, West Bengal

A. G. Gault1,*, F. S. Islam1, D. A. Polya1, J. M. Charnock1,2, C. Boothman1, D. Chatterjee3 and J. R. Lloyd1

1 School of Earth, Atmospheric and Environmental Sciences and Williamson Research Centre for Molecular Environmental Science, University of Manchester, Oxford Road, Manchester M13 9PL, UK
2 CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK
3 Department of Chemistry, University of Kalyani, Kalyani, West Bengal, 741 235, India

* E-mail: Andrew.gault{at}manchester.ac.uk

Arsenic mobilization and Fe(III) reduction in acetate-amended sediments collected from a range of depths from an aquifer with elevated groundwater arsenic concentrations in West Bengal were monitored over a 1 month period. Significant arsenic release was noted in sediment collected from 24 m and 45 m depth, with some Fe(III) reduction also observed in the 24 m sample. The structure of the microbial communities present in the sediments prior to incubation showed marked differences down the sediment column. Profiling of the microbial community in the 24 m and 45 m samples revealed a relatively complex make-up, with Acinetobacter species comprising the bulk of the 24 m sedimentary bacterial population, but no previously characterized As(V)-reducers were detected in either sample.

KEYWORDS: microcosm, aquifer, Bengal, Acinetobacter




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