SELECTIVE LIQUID AND (VINYL-CHLORIDE) PENTOXYVERINE MEMBRANE ELECTRODES - THEIR PREPARATION AND USE FOR THE POTENTIOMETRIC DETERMINATION OFPENTOXYVERINE CITRATE

The use of liquid and poly(vinyl-chloride) membrane electrodes which a re sensitive and reasonably selective for pentoxyverine determination is described here. The electrodes are based on the use of pentoxyverin e-picrate, pentoxyverine-picrolonate and pentoxyverine-tetraphenylbora te ion association complexes as electroactive materials in nitrobenzen e or in poly(vinyl chloride) matrix. These electrodes show near Nernst ian response values in different concentration ranges, depending on th e nature of the used counter-ions, at 3.3-7.8 pH range. Potentiometric determination of pentoxyverine citrate with use of these electrodes g ives good results which later on are compared with those obtained by n on-aqueous titration.