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- W75575812 abstract "The reactions studied were: (1) the hydrolysis constants for Cr(III) and the solubilities of Cr(OH)/sub 3/(s) and Cr/sub x/Fe/sub 1-x/(OH)/sub 3/(ss), (2) the oxidation of aqueous Cr(III) to Cr(VI) by manganese dioxide, and (3) the adsorption of aqueous Cr(VI) by iron oxides. Based on the solubility of Cr(OH)/sub 3/ as a function of pH, hydrolysis constants were determined for the formation of CrOH/sup 2 +/, Cr(OH)/sub 3//sup 0/, and Cr(OH)/sub 4//sup -/, which are dominant aqueous species in different pH regions. The solubilities of Cr(OH)/sub 3/ and Cr/sub x/Fe/sub 1-x/(OH)/sub 3/ from both the oversaturation and undersaturation directions show that the equilibrium is reached in <67 days and that the kinetics of precipitation/dissolution of these solids is relatively fast. Because Cr(OH)/sub 3/ and Cr/sub x/Fe/sub 1-x/(OH)/sub 3/ precipitate rapidly, have low solubilities, and can form under geologic conditions, their solubilities can be used to set upper limits on Cr(III) concentrations in geologic systems. Manganese dioxide oxidized aqueous Cr(III) to Cr(VI) in a pH range of 3.0 to 10.3. The rates of Cr(III) oxidation in acidic solutions (pH 3.0 to 4.7) are relatively more rapid and are primarily dependent on the MnO/sub 2/ surface area and the ratio of Cr(III) tomore » Cr(VI) in solution. Mechanistic constants were developed for the adsorption of CrO/sub 4//sup 2 -/, H/sub 2/CO/sub 3//sup 0//HCO/sub 3//sup -//CO/sub 3//sup 2 -/, SO/sub 4//sup 2 -/, and Ca/sup 2 +/ on amorphous and crystalline iron oxides.« less" @default.
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- W75575812 date "1986-05-01" @default.
- W75575812 modified "2023-09-27" @default.
- W75575812 title "Geochemical behavior of chromium species" @default.
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