Abstract

Conventional plastic membrane electrode, selective to hydralazinium cation (Hz) was constructed by
incorporation of Hz-phosphotungstate ion associate in a poly(vinyl chloride) membrane. The influence of
membrane composition, pH of the test solution and foreign ions on the cell performance was investigated. This
was compared to the corresponding influence on a cell constructed by replacing the reference electrode in the
conventional cell with Cl-selective electrode. The results indicated that the first cell showed Nernstian behavior,
while the latter exhibited super Nernstian response. The selectivity for both cases was high. However the working
pH range was narrower in case of the cell with two sensors.

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