首页> 外文期刊>Journal of Contaminant Hydrology >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
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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

机译:孟加拉盆地西部(印度Bhagirathi子盆地)和东部(Meghna子盆地,孟加拉国)边缘附近的地​​下水砷的水文地球化学比较和重叠氧化还原带的影响

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摘要

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.
机译:尽管在过去的十年中,孟加拉盆地的地下水砷污染得到了广泛的关注,但在该盆地内地质上不同的子盆地中,缺乏对水文地球化学的比较研究。从孟加拉盆地西部边缘(印度纳迪亚的Bhagirathi子盆地;印度; 90个样本)和东部边缘(孟加拉邦的Brahmanbaria; 35个样本)的子盆地中收集了地下水样本。西部站点(纳迪亚)的地下水主要含有Ca-HCO_3水,而东部站点(布拉曼巴里亚)的地下水则具有更多的可变性,至少包含六个不同的相。这两个位点在主要和次要溶质趋势上都存在差异,表明水文地球化学演化的途径不同。但是,两个位点都具有相似的还原性,有毒环境(p_e:+5至-2),且溶解有机碳的浓度较高,表明主要是金属还原过程与As动员机制相似。各种对氧化还原敏感的溶质(例如,As,CH_4,Fe,Mn,NO_3〜-,NH_4〜+,SO_4〜(2-))的趋势指示出重叠的氧化还原区,导致部分氧化还原平衡条件,其中As从中释放出来。由于电子受体之间的复杂相互作用,源矿物质倾向于留在溶液中。

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