ALL-SOLID-STATE POTENTIOMETRIC SENSORS FOR POTASSIUM AND SODIUM BASEDON POLY(PYRROLE) SOLID CONTACT

Potentiometric sensors for potassium or sodium with internal poly(pyrr ole) contact and plastic PVC membrane comprising commercially used ion ophores were developed and investigated. The all-solid-state electrode s obtained exhibit Nernstian responses and stability superior over the coated wire electrodes. In the case of both electrodes, selectivity c oefficients are slightly better compared to those of internal solution electrodes. The dependence of selectivity on the contacting layer ion -exchange properties was observed. The all-solid-state electrodes obta ined were successfully applied in standard serum analysis. (C) 1997 Ac ademic Press.