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• W1983570733 abstract "We examine how the processes of advection, dispersion, oxidation–reduction, and adsorption combine to affect the transport of chromium through columns packed with pyrolusite (β-MnO2)-coated sand. We find that β-MnO2 effectively oxidizes Cr(III) to Cr(VI) and that the extent of oxidation is sensitive to changes in pH, pore water velocity, and influent concentrations of Cr(III). Cr(III) oxidation rates, although initially high, decline well before the supply of β-MnO2 is depleted, suggesting that a reaction product inhibits the conversion of Cr(III) to Cr(VI). Rate-limited reactions govern the weak adsorption of each chromium species, with Cr(III) adsorption varying directly with pH and Cr(VI) adsorption varying inversely with pH. The breakthrough data on chromium transport can be matched closely by calculations of a simple model that accounts for (1) advective-dispersive transport of Cr(III), Cr(VI), and dissolved oxygen, (2) first-order kinetics adsorption of the reduced and oxidized chromium species, and (3) nonlinear rate-limited oxidation of Cr(III) to Cr(VI). Our work supplements the limited database on the transport of redox-sensitive metals in porous media and provides a means for quantifying the coupled processes that contribute to this transport." @default.
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• W1983570733 date "2001-06-01" @default.
• W1983570733 modified "2023-09-26" @default.
• W1983570733 title "Chromium transport, oxidation, and adsorption in manganese-coated sand" @default.
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• W1983570733 doi "https://doi.org/10.1016/s0169-7722(00)00199-6" @default.
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