期刊
JOURNAL OF CONTAMINANT HYDROLOGY
卷 99, 期 1-4, 页码 31-48出版社
ELSEVIER
DOI: 10.1016/j.jconhyd.2007.10.005
关键词
arsenic; groundwater; Bengal Basin; redox; hydrogeochemistry
资金
- Swedish International Development Agency (Sida-SAREC)
- Swedish Research Council (VR-Sida)
- Strategic Environmental Research Foundation (MISTRA)
- Geological Society of America and University of Kentucky
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. (c) 2007 Elsevier B.V. All rights reserved.
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