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Nature and origin of arsenic carriers in shallow aquifer sediments of Bengal Delta, India

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Environmental Geology

Abstract

Sediments from shallow aquifers in Bengal Delta, India have been found to contain arsenic. Rivers of Ganga-Brahmaputra system, responsible for depositing these sediments in the delta, have created a store of arsenic. Geomorphological domains with different depositional styles regulate the pattern of distribution of zones with widely different content of groundwater arsenic. The high arsenic zones occur as narrow sinuous strips confined to channel deposits. A few iron-bearing clastic minerals and two post-depositional secondary products are arsenic carriers. Secondary siderite concretions have grown on the surface of the clastic carriers in variable intensity. The quantity of arsenic in all clastic carriers is in excess of what is generally expected. Excess arsenic is contributed by the element adsorbed on the concretion grown on the surface of the carriers, which adds up to the arsenic in the structure of the minerals. Variable abundance of concretions is responsible for the variable quantity of arsenic in the carriers and the sediment samples. Fe2+ for the growth of siderite concretions is obtained from the iron-bearing clastic carriers. The reaction involves reduction of trivalent iron to bivalent and the required electron is obtained by transformation of As3+ to As5+. It is suggested that oxidation of As3+ to As5+ is microbially mediated. In the Safe zone arsenic is retained in the carriers and groundwater arsenic is maintained below 0.05 mg/l. In the Unsafe zone sorbed arsenic is released from the carriers in the water through desorption and dissolution of concretion, thereby elevating the groundwater arsenic level to above 0.05 mg/l.

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Acknowledgements

The authors are grateful to the Director General, Geological Survey of India for permission to publish this paper. We thank Dr Prosun Bhattacharya of Department of Land and Water Resources, Stockholm for reviewing the paper and suggesting improvements.

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  1. Geological Survey of India, 15 A & B Kyd Street, 700016, Calcutta, India

    S. Sengupta, P. K. Mukherjee, T. Pal & S. Shome

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  1. S. Sengupta
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  2. P. K. Mukherjee
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  3. T. Pal
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  4. S. Shome
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Correspondence to S. Sengupta.

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Sengupta, S., Mukherjee, P.K., Pal, T. et al. Nature and origin of arsenic carriers in shallow aquifer sediments of Bengal Delta, India. Env Geol 45, 1071–1081 (2004). https://doi.org/10.1007/s00254-004-0965-8

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