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See Chinese contents: GB/T 31931-2015 GB/T 31931-2015: Zinc or zinc alloy coating on steel sheets or strips -- Determination of hexavalent chromium content. 1, 5-Diphenylcarbohydrazide (diphenylcarbazide) spectrophotometric method
This Standard specifies using Diphenylcarbazide Spectrophotometric Method to determine the hexavalent chromium content.
