Selectivity parameters of homogeneous solid-state chloride ion-selective electrodes and the surface morphology of silver chloride-silver sulphide discs under simulated interference conditions

Abstract

Selectivity coefficients for bromide, hydroxide, iodide and thiocyanate for Orion 94–17A chloride ion-selective electrodes have been measured using separate and mixed solution methods. Except for iodide runs in mixed solutions both procedures gave k^Pot._Cl,B values reasonably close to predictions based on the solubility product ratios of the corresponding silver salts. The surfaces of silver chloride-silver sulphide discs, pressed in the manner of commercial sensor material, have been exposed to bromide and examined using X-ray fluorescence and X-ray photoelectron spectroscopy.