The behaviour of mixed metal sulphide/silver suphide sensing materials in solutions of silver ions
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Hydrophobized graphite electrodes activated with CuS/Ag2S can be used to measure silver ion activities as effectively as silver sulphide electrodes, whereas electrodes activatd with PbS/Ag2S or CdS/Ag2S are useless for this purpose. The CuS/Ag2S electrode is also suitable for use in potentiometric titrations involving species that are not contained in the sensing material, but are capable of producing precipitates with silver or sulphide ions.