Chemistry
8 years ago

New method detects harmful chromium in sea water with high accuracy.

Analytica Chimica Acta
Determination of chromium(III) and chromium(VI) in sea water by atomic absorption spectrometry
G.J. de Jong, U.A.Th. Brinkman

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Researchers developed a method to measure chromium(III) and chromium(VI) in sea water. They used Aliquat-336 to extract chromium(VI) from slightly acidic samples and thiocyanate to extract chromium(III) from neutral solutions. The chromium levels were then measured using atomic absorption spectrometry. The detection limits were found to be 0.01 μg 1-1 for chromium(VI) and 0.03 μg 1-1 for chromium(III). Additionally, chromium(III) can be oxidized to chromium(VI) for extraction using ammonium persulphate.