Chemistry
8 years ago

New method detects harmful chromium in water, reveals surprising predominant species.

The Analyst
Flow analysis of micro amounts of chromium(III) and (VI) in natural water by solid phase spectrophotometry using diphenylcarbazide
Shiro Matsuoka, Yoshika Tennichi, Kô Takehara, Kazuhisa Yoshimura

Paper Summary

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Researchers developed a method to detect chromium(III) and chromium(VI) in natural water samples without separating them. They used a cation-exchange resin and diphenylcarbazide to concentrate chromium in the sample. Chromium(III) was oxidized to chromium(VI) using peroxodisulfate, and its concentration was calculated by subtracting chromium(VI) from total chromium. The method detected chromium(VI) and total chromium at levels as low as 70 pg and 120 pg, respectively. The results showed that chromium(VI) was the main form of chromium in natural water, contrary to previous studies.