Abstract
Potentioimetric titrations of bases with perchloric acid, and of reducing substances with lead(IV) acetate, in acetic acid medium and in a mixture of acetic acid and acetic anhydride are discussed. The indicator electrodes used were: a Radelkis membrane graphite electrode (OP-C-7112 C), laboratory-prepared silicone rubber-based graphite electrodes, an Elektrokarbon graphite electrode (SU 106), a Radiometer glass electrode (G 200 B), and a platinum electrode. In addition, new types of silicone rubber-based electrodes were prepared by incorporating mixtures of graphite and manganese dioxide, graphite and quinhydrone, and manganese dioxide in their membranes. A manganese dioxide electrode was also prepared by electrolytic precipitation of manganese on a platinum anode. The properties of all the cited electrodes are compared. The influence of oxidants, especially potassium permanganate, on the behaviour and sensitivity of graphite membrane electrodes in the potentiometric acid—base and redox titrations is described.
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