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Constant-current coulometric titration is applied to the determination of manganese and chromium contained in organic compounds. These compounds are decomposed in a mixture of sulphuric and nitric acids. The Mn and Cr are oxidized by ammonium persulphate to MnO(4)(-) and by perchloric acid to Cr(2)O(7)(2-) respectively. MnO(4)(-) and Cr(2)O(7)(2-) are titrated by Fe(2+) electrolytically generated from Fe(3+) by constant-current eletrolysis, with amperometric endpoint detection.
Bigois
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Service Central de Microanalyse du Centre National de la Recherche Scientifique, 2, rue Henry Dunant, 94-Thiais, France.