Do Ponds Cause Arsenic-Pollution of Groundwater in the Bengal Basin? An Answer from West Bengal
We report time-series data collected over two years for δ18O, δ2H, and Ca, Mg, K, and Cl, concentrations for 10 ponds in, and upflow of, an As-polluted region of southern West Bengal. We compare the compositions of As-polluted groundwaters from wells with the compositions of waters in ponds upflow,...
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Published in | Environmental science & technology Vol. 42; no. 14; pp. 5156 - 5164 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
15.07.2008
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Subjects | |
Online Access | Get full text |
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Summary: | We report time-series data collected over two years for δ18O, δ2H, and Ca, Mg, K, and Cl, concentrations for 10 ponds in, and upflow of, an As-polluted region of southern West Bengal. We compare the compositions of As-polluted groundwaters from wells with the compositions of waters in ponds upflow, and within the range of influence, of the wells. Conservative tracers (δ18O, δ2H, K), and other tracers (Ca, Mg) that are likely conservative in the waters, show that pondwater and groundwater are distinct and do not overlap in composition. These data show that water from ponds cannot be identified in As-polluted groundwater, so putative DOC in pondwater cannot be mixing into the As-polluted groundwater we have sampled. Separate estimates of the degree of recharge from ponds to groundwater, using calculations based on temporal variations in salt content and isotopic composition in ponds, and salt-balance, show that insignificant amounts of As-polluted groundwater are derived via pond recharge. It follows that pondwater in the study area does not contribute significant mass to arsenic-polluted groundwater and so does not provide organic matter to aquifers in amounts sufficient to drive reduction of iron oxyhydroxides and hence arsenic pollution. |
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Bibliography: | istex:175C49BB58DCF7DAEF2240FBDDE68FAD3CC0A6B4 ark:/67375/TPS-JSG3XFCM-0 Table S1 (time-series data on pondwaters), Table S2 (groundwater compositions), Table S3 (piezometer waters), and Figure S1. This material is available free of charge via the Internet at http://pubs.acs.org. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0013-936X 1520-5851 |
DOI: | 10.1021/es702988m |