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• W2577654310 endingPage "2067" @default.
• W2577654310 startingPage "2058" @default.
• W2577654310 abstract "Chromium(VI) produced from the oxidation of indigenous Cr(III) minerals is increasingly being recognized as a threat to groundwater quality. A critical determinant of Cr(VI) generation within soils and sediments is the necessary interaction of two low-solubility phases-Cr(III) silicates or (hydr)oxides and Mn(III/IV) oxides-that lead to its production. Here we investigate the potential for Cr(III) oxidation by Mn oxides within fixed solid matrices common to soils and sediments. Artificial aggregates were constructed from Cr(OH)3- and Cr0.25Fe0.75(OH)3-coated quartz grains and either mixed with synthetic birnessite or inoculated with the Mn(II)-oxidizing bacterium Leptothrix cholodnii. In aggregates simulating low organic carbon environments, we observe Cr(VI) concentrations within advecting solutes at levels more than twenty-times the California drinking water standard. Chromium(VI) production is highly dependent on Cr-mineral solubility; increasing Fe-substitution (x = 0 to x = 0.75) decreases the solubility of the solid and concomitantly decreases total Cr(VI) generation by 37%. In environments with high organic carbon, reducing conditions within aggregate cores (microbially) generate sufficient Fe(II) to suppress Cr(VI) efflux. Our results illustrate Cr(VI) generation from reaction with Mn oxides within structured media simulating soils and sediments and provide insight into how fluctuating hydrologic and redox conditions impact coupled processes controlling Cr and Mn cycling." @default.
• W2577654310 created "2017-01-26" @default.
• W2577654310 creator A5014030193 @default.
• W2577654310 creator A5044660683 @default.
• W2577654310 date "2017-02-07" @default.
• W2577654310 modified "2023-10-17" @default.
• W2577654310 title "Hexavalent Chromium Generation within Naturally Structured Soils and Sediments" @default.
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• W2577654310 doi "https://doi.org/10.1021/acs.est.6b04039" @default.
• W2577654310 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28084730" @default.
• W2577654310 hasPublicationYear "2017" @default.
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