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Science 15 March 2002:
Vol. 295. no. 5562, pp. 2024 - 2025
DOI: 10.1126/science.1070031
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Perspectives

ENVIRONMENTAL CHEMISTRY:
Tracking Hexavalent Cr in Groundwater

David Blowes

Hexavalent chromium, a toxic and carcinogenic substance, is a common inorganic contaminant in groundwater. In contrast, trivalent chromium is a nutrient at trace levels. In his Perspective, Blowes highlights the stable isotope technique reported by Ellis et al. for tracking reduction of hexavalent to trivalent chromium. The technique will help to assess various groundwater remediation options.

The author is in the Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. E-mail: blowes{at}sciborg.uwaterloo.ca

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Mass-Dependent Fractionation of Selenium and Chromium Isotopes in Low-Temperature Environments.
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