Sciective Electrodes for Silver and Anions Based on Polymeric Membranes Containing Complexes of Triisobutylphosphine Sulfide with Silver

Polymer membrane ion-Selctive electrodes have been prepared by using a water-Insoluble complex of silver with triisobutylphosphine sulfide (TIBPS) as the ion carrier. These electrodes respond to silver as well as to iodide, thiocyanate, and bromide in a near-Nernstian fashion. In addition, they present good detection limits for the above-mentioned ions. It is postulated that the mechanism of response of these electrodes is very similar to the one of the pressed-pellet electrodes. Since the latter exhibit interference by suH-hydryl-containing proteins, the effect caused by ovalbumin on the TIPBS-based electrodes has been investigated. Reduction of this interference is achieved by using polymeric matrices that contain free hydroxyl or carboxyl groups. © 1991, American Chemical Society. All rights reserved.