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Hydrogeochemical behavior of arsenic-enriched groundwater in the deltaic environment: Comparison between two study sites in West Bengal, India
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2008 (English)In: Journal of Contaminant Hydrology, ISSN 0169-7722, E-ISSN 1873-6009, Vol. 99, no 1-4, 22-30 p.Article in journal (Refereed) Published
Abstract [en]

Groundwaters have been collected from deltaic areas of West Bengal (Chakdaha and Baruipur blocks) to record their hydrogeochemical characteristics, and to verify the mechanism of arsenic (As) release. The data reveals that shallow (< 70 m) groundwaters in both areas are of Ca-Mg-HCO3 type; however deeper (> 70 m) groundwaters in Baruipur areas are slightly enriched with Na, Cl and 504, indicating possible saline water intrusion. The groundwater is anoxic (mean Eh: - 124 and - 131 mV) with high levels of As (mean: 116 and 293 mu g/L), Fe (mean: 4.74 and 3.83 mg/L), PO4 (mean: 3.73 and 3.21 mg/L) and Mn (mean: 0.37 and 0.49 mg/L), respectively for Chakdaha and Baruipur areas. The observed values of As and bicarbonate (mean: 409 and 499 mg/L) in the shallow aquifer are indicative of redox processes (e.g., oxidation of organic matter) favouring the release of As. Moreover, the presence of DOC in the shallow aquifer suggests that organic matter is young and reactive, and may actively engage in redox driven processes. Our study further confirms that both Fe- and Mn-reduction processes are the dominant mechanisms for As release in these groundwaters.

Place, publisher, year, edition, pages
2008. Vol. 99, no 1-4, 22-30 p.
Keyword [en]
Bengal Delta Plain, arsenic mobility, geochemistry, redox behavior, aquifer
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-36400DOI: 10.1016/j.jconhyd.2008.04.004ISI: 000259055100003Scopus ID: 2-s2.0-48349086104OAI: oai:DiVA.org:kth-36400DiVA: diva2:430698
Note

QC 20110712.

Correction:  Journal of contaminant hydrology Volume: 131   Issue: 1-4   Pages: 119-120   2012  DOI: 10.1016/j.jconhyd.2012.02.006   

ISI 000302845800010

Retraction:  Journal of contaminant hydrology Volume: 146   Pages: 74-74  2013   DOI: 10.1016/j.jconhyd.2012.11.002   

ISI 000318824600007

 

 

Available from: 2011-07-12 Created: 2011-07-12 Last updated: 2017-12-11Bibliographically approved

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Bhattacharya, Prosun

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