Abstract
The mobilization of dissolved arsenic (As) in groundwater environment is controlled by its chemodynamics associated with solid-phase arsenic. The mechanism of Arsenic mobilization in the Groundwater of the alluvial plains of river Brahmaputra were studied from aqueous and solid-phase geochemical analyses of groundwater samples and sediment cores at various depths from a borehole. The sediments cores were analyzed for parameters like total and sequentially extracted Fe and As, organic carbon content and carbonate phases. The groundwater samples collected from the close proximity of the drilled bore well were analyzed for major and trace element hydrogeochemistry. Fe oxyhydroxides were observed as the major leachable for arsenic solid phases. The presence of Fe oxyhydroxides was found in the aquifer sediments using scanning electronic microscope energy-dispersive X-ray (SEM-EDX) and X-ray diffraction (XRD) analysis. This experimental research study suggest that bacterially mediated reductive dissolution FeOOH is probably an important mechanism for releasing As from the sediments into the groundwater.
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