title: Chromium isotopes and the fate of hexavalent chromium in the environment.
abstract: Measurements of chromium (Cr) stable-isotope fractionation in laboratory experiments and natural waters show that lighter isotopes reacted preferentially during Cr(VI) reduction by magnetite and sediments. The 53Cr/52Cr ratio of the product was 3.4 +/- 0.1 per mil less than that of the reactant. 53Cr/52Cr shifts in water samples indicate the extent of reduction, a critical process that renders toxic Cr(VI) in the environment immobile and less toxic.
authors.affiliation: Department of Geology, University of Illinois at Urbana-Champaign, 245 Natural History Building, Urbana, IL 61801, USA.
authors.forename: Andre S
authors.initials: AS
authors.lastname: Ellis
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Johnson
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Bullen
mesh_terms: D002140:California; D002274:Carcinogens, Environmental / Q000032:analysis* / Q000737:chemistry; D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D002859:Chromium Isotopes / Q000032:analysis* / Q000737:chemistry; D003237:Connecticut; D052203:Ferrosoferric Oxide; D019015:Geologic Sediments / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification
chemical_list: D002274:Carcinogens, Environmental; D002859:Chromium Isotopes; D010087:Oxides; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D007501:Iron; D052203:Ferrosoferric Oxide