POTENTIOMETRIC AND VOLUMETRIC ESTIMATION OF PEROXIDES WITH ALKALINE PERMANGANATE

Peroxide solutions reduce alkaline permanganate in presence of telluric acid to quadrivalent manganese. The method can be used for the potentiometric estimation of peroxides, the errors differing from the acid permanganate method by not more than o 5%. Another method, which can be applied, consists in mixing the peroxide solution with excess of KMnO₄, in presence of 0.5 N-NaOH, and 0.2 g. telluric acid, followed by determining the excess oxidant with oxalic acid or ferrous iron.