CONDUCTING POLYMER-BASED ION-SELECTIVE ELECTRODES

Single-piece, conducting polymer-based, potentiometric sensors with en hanced cationic sensitivity were obtained by doping a polypyrrole with metal-complexing, multivalent anions. Sulphosalycilic acid, Tiron, Er iochrome Black T and Kalces have been used as doping ions. Predominant sensitivity for copper was observed for the first two dopants, wherea s for the two remaining ones, induced response for magnesium and calci um was found, respectively. Interestingly, in all sensors studied the metal-binding properties of the specific ligands known from polar solv ents were retained. Hence, the specific reagents can be deliberately u tilized for the construction of conducting polymer-based ion-selective sensors.