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- W2033505571 abstract "Mobilization of arsenic (As) in groundwater has become a focus of attention in recent years. A few years back, groundwater As is found as a geogenic contaminant in the upper stream Ganges River basin immediately adjoining to the Himalayan foothills (the Terai Region of Nepal). The source is said to be leached due to weathering of As-bearing minerals. In this study, geologic, hydrogeologic, and geochemical data were used to characterize the As source and the geochemical process controlling As-mobilization in the groundwater aquifers of Terai Region. The findings suggest that the reductive dissolution of iron-oxyhydroxide is the main mechanism of As-mobilization in Terai aquifers. This mechanism is supported by a number of evidences including, 1) presence of arsenolite and scorodite As-bearing minerals; 2) presence of high concentration of As, Fe and low concentration of SO42 − and NO3−; 3) presence of strong linkage between As and HCO3− and negative correlation between As and oxidation reduction potential; 4) presence of abundant percentage of Fe and Mn-oxides in the sediment samples; 5) presence of similar depth profile trend of As with those of Fe and Mn-oxides; 6) presence of Fe, O and Mn confirmed by energy dispersive X-ray spectroscopy analysis; and 6) presence of predominant form of As adsorbed on organic matter and Fe-oxyhydroxide phases of sequential leaching." @default.
- W2033505571 created "2016-06-24" @default.
- W2033505571 creator A5053878164 @default.
- W2033505571 creator A5072884287 @default.
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- W2033505571 date "2015-01-01" @default.
- W2033505571 modified "2023-10-03" @default.
- W2033505571 title "Reductive dissolution of iron-oxyhydroxides directs groundwater arsenic mobilization in the upstream of Ganges River basin, Nepal" @default.
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- W2033505571 doi "https://doi.org/10.1016/j.gexplo.2014.09.002" @default.
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