Inorganic Salts Trapped in Neutral Carrier Ion-Selective Electrode Membranes form Ion-Exchange Sites

Abstract

Deliberately added hydrophilic salt contaminations behave as ion-exchange sites in the plasticized PVC membrane of a neutral carrier ion-selective electrode. The added salt does not influence the potenticmetric performance of the membrane. Since the membrane without added salt is itself an ion-exchanger, its ion-exchange capacity may be linked to ionizable hydrophilic impurities.