The behaviour of silver phosphate as the electroactive sensor in a phosphate-sensitive electrode

A phosphate ion-selective electrode based on silver phosphate as the electroactive material is described. The behaviour of the electrode is Nernstian, the response time is 2 min, the detection limit is 10^-5 M total phosphate, and the short-term stability is within 0.5 mV. The most serious interfering ion is chloride; no interferences were found from polyphosphates, nitrates or sulfates.