Pathways of arsenic from sediments to groundwater in the hyporheic zone: Evidence from an iron isotope study
作者： Xianjun Xie , Thomas M. Johnson , Yanxin Wang , Craig C. Lundstrom , Andre Ellis
DOI: 10.1016/J.JHYDROL.2014.02.006
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摘要: Summary Ssulfide, Fe content and heavy isotopic signatures of the bulk core sediments all indicate anoxic sulfidic conditions in hyporheic zone. The relationship between Ssulfide contents suggests that Fe(III) oxides/hydroxides are transferred non-sulfidic Fe(II) minerals Fe(II)-sulfides under conditions, respectively. isotope composition provides further evidence microbial dissimilatory reduction formation dominant geochemical pathways take place at different depths In upper sections Core A B (with depth less than ≈10 m), govern cycling water sediments. Microbial SO 4 2 - interaction produced Fe(II)aq precipitate control δ56Fe values sample midsections (≈13–19 m) A. Conversely, abiotic by HS− determines B. is limited controls bottom both cores. variation As concentration similar each depth, indicating enrichment strongly associated with minerals. enriched-δ56Fe high concentrations suggest process promotes mobility zones.
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