Change search
ReferencesLink to record
Permanent link

Direct link
Hydrogeochemical comparison and effects of overlapping redox zones on groundwater arsenic near the Western (Bhagirathi sub-basin, India) and Eastern (Meghna sub-basin, Bangladesh) margins of the Bengal Basin
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology. (KTH-International Groundwater Arsenic Research Group)ORCID iD: 0000-0003-4350-9950
Show others and affiliations
2008 (English)In: Journal of Contaminant Hydrology, ISSN 0169-7722, E-ISSN 1873-6009, Vol. 99, no 1-4, 31-48 p.Article in journal (Refereed) Published
Abstract [en]

Although arsenic (As) contamination of groundwater in the Bengal Basin has received wide attention over the past decade, comparative studies of hydrogeochemistry in geologically different sub-basins within the basin have been lacking. Groundwater samples were collected from sub-basins in the western margin (River Bhagirathi sub-basin, Nadia, India; 90 samples) and eastern margin (River Meghna sub-basin; Brahmanbaria, Bangladesh; 35 samples) of the Bengal Basin. Groundwater in the western site (Nadia) has mostly Ca-HCO3 water while that in the eastern site (Brahmanbaria) is much more variable consisting of at least six different facies. The two sites show differences in major and minor solute trends indicating varying pathways of hydrogeochemical evolution However, both sites have similar reducing, postoxic environments, (p(e): +5 to -2) with high concentrations of dissolved organic carbon, indicating dominantly metal-reducing processes and similarity in As mobilization mechanism. The trends of SO42- various redox-sensitive solutes (e.g. As, CH4, Fe, Mn, NO3-, NH4+, SO42-) indicate overlapping redox zones, leading to partial redox equilibrium conditions where As, once liberated from source minerals, would tend to remain in solution because of the complex interplay among the electron acceptors.

Place, publisher, year, edition, pages
2008. Vol. 99, no 1-4, 31-48 p.
Keyword [en]
arsenic, groundwater, Bengal Basin, redox, hydrogeochemistry, multivariate statistical-methods, shallow sandy aquifer, water, chemistry data, sulfate reduction, organic-matter, natural-waters, ganges delta, classification, mobility, methanogenesis
National Category
Environmental Sciences
URN: urn:nbn:se:kth:diva-17810DOI: 10.1016/j.jconhyd.2007.10.005ISI: 000259055100004ScopusID: 2-s2.0-48449105999OAI: diva2:335855
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-11-29Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Bhattacharya, Prosun
By organisation
Environmental Geochemistry and Ecotechnology
In the same journal
Journal of Contaminant Hydrology
Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 18 hits
ReferencesLink to record
Permanent link

Direct link