Chromium isotopes and the fate of hexavalent chromium in the environment.
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.
Ellis
Andre S
AS
Department of Geology, University of Illinois at Urbana-Champaign, 245 Natural History Building, Urbana, IL 61801, USA.
Johnson
Thomas M
TM
Bullen
Thomas D
TD
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
D002274:Carcinogens, Environmental; D002859:Chromium Isotopes; D010087:Oxides; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D007501:Iron; D052203:Ferrosoferric Oxide