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Geochemistry of arsenic in the deltaic environment: Shallow versus deeper aquifer levels

Authors: Chatterjee, D., Biswas, A., Majumder, S., Berner, Z. and Neidhardt, H.

Journal: Water Rock Interaction Proceedings of the 13th International Conference on Water Rock Interaction Wri 13

Pages: 437-440

Abstract:

This study deals with groundwater quality and As mobilization behavior in the shallow (up to -50 m) and deeper (below -100 m) aquifer levels in Bengal Delta Plain. The groundwaters from shallow aquifer levels are enriched with redox sensitive species, HCO 3 ^-, DOC, PO 4 ^-3 and NH 4 ⁺, whereas the deeper aquifer level contains relatively low As, PO 4 ^-3, DOCand NH 4 ⁺, low to very low Fe (II), and high HCO 3 ^-. In the shallow aquifer levels, As release to the groundwater is a combination of Fe reduction, local recharge and ion-exchange processes. However, in the deeper aquifer As mobilization is mostly governed by carbonate dissolution and chloride exchange processes. © 2010 Taylor & Francis Group, London.

Source: Scopus