title: 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.
abstract: 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-HCO(3) 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 various redox-sensitive solutes (e.g. As, CH(4), Fe, Mn, NO(3)(-), NH(4)(+), SO(4)(2-)) 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.
authors.affiliation: Bureau of Economic Geology, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78758, USA. abhijit.mukherjee@beg.utexas.edu
authors.forename: Abhijit
authors.initials: A
authors.lastname: Mukherjee
authors.forename: Mattias
authors.initials: M
authors.lastname: von Brömssen
authors.forename: Bridget R
authors.initials: BR
authors.lastname: Scanlon
authors.forename: Prosun
authors.initials: P
authors.lastname: Bhattacharya
authors.forename: Alan E
authors.initials: AE
authors.lastname: Fryar
authors.forename: Md Aziz
authors.initials: MA
authors.lastname: Hasan
authors.forename: Kazi Matin
authors.initials: KM
authors.lastname: Ahmed
authors.forename: Debashis
authors.initials: D
authors.lastname: Chatterjee
authors.forename: Gunnar
authors.initials: G
authors.lastname: Jacks
authors.forename: Ondra
authors.initials: O
authors.lastname: Sracek
mesh_terms: D001151:Arsenic / Q000032:analysis*; D004784:Environmental Monitoring; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis / Q000737:chemistry; D055593:Geological Phenomena; D007194:India; D019156:Indian Ocean; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D001151:Arsenic