Influences of groundwater extraction on the distribution of dissolved As in shallow aquifers of West Bengal, India
2013 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 262, 941-950 p.Article in journal (Refereed) Published
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 22-25m depth, where Astot concentrations increased within weeks from 100 to 315μgL-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.
Place, publisher, year, edition, pages
2013. Vol. 262, 941-950 p.
Arsenic, Bengal Delta Plain, Groundwater, Monitoring, Pumping, Spatiotemporal trends
Other Earth and Related Environmental Sciences Water Engineering
IdentifiersURN: urn:nbn:se:kth:diva-139925DOI: 10.1016/j.jhazmat.2013.01.044ISI: 000329595500113ScopusID: 2-s2.0-84887607901OAI: oai:DiVA.org:kth-139925DiVA: diva2:688558
QC 201401172014-01-172014-01-152014-02-17Bibliographically approved