A solid-state hydroxide ion selective electrode for the measurement of high pH values

A solid-state ion selective electrode, which is sensitive to hydroxide ion concentration has been prepared. This electrode with a 10% Cu2S and 90% Ag2Se composition exhibited an analytically useful potential change from 10−6 to 10−1 M hydroxide ion, pH 8–13. The slope of linear portion is about 58 mV per decade change in hydroxide concentration. There was no interference of K+, Na+, Ca2+, Zn2+ and Mg2+ cations and Cl−, NO3− and SO42− anions. The response time was 30 s and the lifetime was about 2 years.