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. The53Cr/52Cr ratio of the product was 3.4 ± 0.1 per mil less than that of the reactant.53Cr/52...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2002-03, Vol.295 (5562), p.2060-2062
Hauptverfasser:	Ellis, Andre S., Johnson, Thomas M., Bullen, Thomas D.
Format:	Artikel
Sprache:	eng
Schlagworte:	Aquifers Butadienes California Carcinogens, Environmental - analysis Carcinogens, Environmental - chemistry Chromium Chromium (Metal) Chromium - analysis Chromium - chemistry Chromium Isotopes - analysis Chromium Isotopes - chemistry Connecticut Contamination Earth sciences Earth, ocean, space Environment Environmental aspects Environmental cleanup Environmental impact analysis Exact sciences and technology Ferrosoferric Oxide Fractionation Freshwater Geologic Sediments - chemistry Groundwater Hydrogen-Ion Concentration Iron - chemistry Isotope geochemistry Isotope geochemistry. Geochronology Isotopes Laboratory Experiments Lasers Magnetite Measurement Oxidation-Reduction Oxides - chemistry Plumes Sediments Water Pollutants, Chemical - analysis Water pollution Water Purification Water quality Water, Underground
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Zusammenfassung:	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. The53Cr/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.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.1068368