Tracking Hexavalent Cr in Groundwater

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Science  15 Mar 2002:
Vol. 295, Issue 5562, pp. 2024-2025
DOI: 10.1126/science.1070031

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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.