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• W2000611186 abstract "Solid-phase associations of chromium were examined in core materials collected from a full-scale, zerovalent iron permeable reactive barrier (PRB) at the U.S. Coast Guard Support Center located near Elizabeth City, NC. The PRB was installed in 1996 to treat groundwater contaminated with hexavalent chromium. After eight years of operation, the PRB remains effective at reducing concentrations of Cr from average values >1500 μg L-1 in groundwater hydraulically upgradient of the PRB to values <1 μg L-1 in groundwater within and hydraulically downgradient of the PRB. Chromium removal from groundwater occurs at the leading edge of the PRB and also within the aquifer immediately upgradient of the PRB. These regions also witness the greatest amount of secondary mineral formation due to steep geochemical gradients that result from the corrosion of zerovalent iron. X-ray absorption near-edge structure (XANES) spectroscopy indicated that chromium is predominantly in the trivalent oxidation state, confirming that reductive processes are responsible for Cr sequestration. XANES spectra and microscopy results suggest that Cr is, in part, associated with iron sulfide grains formed as a consequence of microbially mediated sulfate reduction in and around the PRB. Results of this study provide evidence that secondary iron-bearing mineral products may enhance the capacity of zerovalent iron systems to remediate Cr in groundwater, either through redox reactions at the mineral−water interface or by the release of Fe(II) to solution via mineral dissolution and/or metal corrosion." @default.
• W2000611186 created "2016-06-24" @default.
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• W2000611186 date "2005-04-30" @default.
• W2000611186 modified "2023-09-30" @default.
• W2000611186 title "Chromium-Removal Processes during Groundwater Remediation by a Zerovalent Iron Permeable Reactive Barrier" @default.
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• W2000611186 doi "https://doi.org/10.1021/es050157x" @default.
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