Polycrystalline ion-selective electrode based on Ag2[HgI4]-Ag2S
Abstract
The preparation and analytical behaviour of polycrystalline solid-state ionselective electrodes based on Ag2[HgI4] and Ag2[HgI4]-Ag2S membranes was studied. The membranes consist of solid-state pellets made by compressing prepared precipitates. The performance characteristics of the electrodes are described in terms of potential-activity graphs, stabilities, precision, response times, effect of pH and redox potential. The electrode responses towards Ag+, Hg+, Hg2+, I– and CN– ions are evaluated. It was found that the Ag2[HgI4]-Ag2S type is superior to the Ag2[HgI4] type with respect to mechanical properties and lifetime and is more suitable for practical application.