Hydrogeochemical behavior of arsenic-enriched groundwater in the deltaic environment: Comparison between two study sites in West Bengal, India
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
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.
Bengal Delta Plain, arsenic mobility, geochemistry, redox behavior, aquifer
IdentifiersURN: urn:nbn:se:kth:diva-36400DOI: 10.1016/j.jconhyd.2008.04.004ISI: 000259055100003ScopusID: 2-s2.0-48349086104OAI: oai:DiVA.org:kth-36400DiVA: diva2:430698
Correction: Journal of contaminant hydrology Volume: 131 Issue: 1-4 Pages: 119-120 2012 DOI: 10.1016/j.jconhyd.2012.02.006
Retraction: Journal of contaminant hydrology Volume: 146 Pages: 74-74 2013 DOI: 10.1016/j.jconhyd.2012.11.002