Kinetic Fractionation of Antimony Isotopes during Reduction by Sulfide
Hannah J. Veldhuizen,
Joel S. MacKinney,
Thomas M. Johnson
Abstract:Stable isotope ratios of antimony (Sb) in the environment can provide valuable information on sources and processes such as redox transformations. To investigate the fractionation when Sb(V) is chemically reduced by sulfide to Sb(III), experiments with 0.008 to 0.01 mM Sb(V) and 0.009 to 6 mM sulfide at a pH of 1 to 8 were performed. Experiments at pH 1 to 6 precipitated Sb2S3, while at pH 7 to 8 Sb(III) remained in solution. The Sb(III) product was enriched in the lighter isotope. The isotopic fractionation (… Show more
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