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Experimental investigation of actual problems in the colorimetric determination of chromium with diphenylcarbazide



Experimental investigation of actual problems in the colorimetric determination of chromium with diphenylcarbazide



Industrial Health 24(1): 41-50



Upon performing colorimetric determination of chromium with diphenylcarbazide (DPC), the following were found. The color development proceeded not only in dilute sulphuric acid solution, but also in solutions of HNO3, HCI, HCIO4 and CH3COOH or in mixed solutions of these acids. Wide concentration ranges (about 0.01-05N) of these single acids allowed perfect development of the Cr6+ coloration with DPC. Mixed solutions of 0.1-1% of these acids also resulted in perfect color development. HCIO4 proved to be the most excellent oxidant of Cr3+ to Cr6+ for the reaction with DPC compared with MnO2 and PbO2. The mixed acid (HCIO4 + H2SO4) was more suitable than single HCIO4 for this oxidation.

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Accession: 005424047

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PMID: 3710836



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