Abstract
Silicone rubber-based graphite electrodes have been used as indicator electrodes in potentiometric acid-base titrations. The pH sensitivity of the electrodes is increased by pretreatment with various oxidants, acidic permanganate solutions being most suitable. When electrodes “activated” in this way are used, the potential jumps at the end-point are greater than those obtained with conventional electrodes, which is favourable for the titration of weak acids and bases. These electrodes can be used in aqueous or non-aqueous media. A measuring cell consisting of a silicone rubberbased graphite electrode of small surface area and an appropriate silicone rubberbased ion-selective reference electrode, is suitable for acid-base titrations in volumes less than 1 ml.
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