Oxidations with potassium permanganate in the presence of fluoride |
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| Authors: | I M Issa and M Hamdy |
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| Institution: | (1) Chemistry Department, Faculty of Science, Cairo University, Egypt U.A.R.;(2) Chemistry Department, Faculty of Science, Assiut University, Egypt U.A.R. |
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| Abstract: | Summary Trivalent chromium and quadrivalent vanadium can be determined with fair accuracy by a method consisting in mixing either with an excess of KMnO4 in the presence of 0.3 to 1.8 M alkali hydroxide. After leaving the mixture for 5 min, the solution is acidified with sulphuric acid and mixed with 50 to 75 ml of 2% NaF solution. An excess of monovalent mercury Hg2
2+ solution is then added, the solution heated to 40° C and then titrated with KMnO4 solution in the presence of Cu2+ ions to conceal the pink manganic fluoride colour.Part II: Issa, I. M., and M. Hamdy: Z. analyt. Chem. 172, 162 (1960). |
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