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Description
Colorimetric determination of chromium (VI)
In sulphuric acid chromate ions react with diphenylcarbazide to form a red-violet dye.
Chromium compounds can be present in industrial waste waters in trivalent form [chromium(III) ions] and in hexavalent form (chromate and dichromate ions). In order to determine the total chromium all other valencies must be oxidised to chromium(VI).
