Potentiometric gas sensing electrodes

Abstract

A num her ofpotentiometric gas sensing electrodes using a hydrogen or other ion sensing electrode and agaspermeable mem brane have been st udied. A theoretical model has been developed describing the time response, electrical potential behaviour and Iimit of detection as a function of membrane properties, geometry, and internal electrolyte composition. Electrodes responding to carbon dioxidc, ammonia, amines, sulphur dioxide, nitrogen dioxidc, hydrogen sulphidc, hydrogen cyanide, hydrogen fluoride, acetic acid, and chlorine have been constructed and their response characteristics are found to be in good agrecment with thc theorctical predictions.