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Influences of groundwater extraction on the distribution of dissolved As in shallow aquifers of West Bengal, India

Authors :
Harald Neidhardt
Ashis Biswas
Dominik Freikowski
Zsolt Berner
Josef Winter
Debashis Chatterjee
Stefan Norra
Source :
Journal of Hazardous Materials. 262:941-950
Publication Year :
2013
Publisher :
Elsevier BV, 2013.

Abstract

Here we report temporal changes of As concentrations in shallow groundwater of the Bengal Delta Plain (BDP). Observed fluctuations are primarily induced by seasonally occurring groundwater movement, but can also be connected to anthropogenic groundwater extraction. Between December 2009 and July 2010, pronounced variations in the groundwater hydrochemistry were recorded in groundwater samples of a shallow monitoring well tapping the aquifer in 22-25 m depth, where Astot concentrations increased within weeks from 100 to 315 μg L(-1). These trends are attributed to a vertically shift of the hydrochemically stratified water column at the beginning of the monsoon season. This naturally occurring effect can be additionally superimposed by groundwater extraction, as demonstrated on a local scale by an in situ experiment simulating extensive groundwater withdrawal during the dry post-monsoon season. Results of this experiment suggest that groundwater extraction promoted an enduring change within the distribution of dissolved As in the local aquifer. Presented outcomes contribute to the discussion of anthropogenic pumping influences that endanger the limited and yet arsenic-free groundwater resources of the BDP.

Details

ISSN :
03043894
Volume :
262
Database :
OpenAIRE
Journal :
Journal of Hazardous Materials
Accession number :
edsair.doi.dedup.....b7c27008a072bf7174b34801c1c37b8a
Full Text :
https://doi.org/10.1016/j.jhazmat.2013.01.044