Abstract
Hydrophobized graphite electrodes activated with CuS/Ag 2S can be used to measure silver ion activities as effectively as silver sulphide electrodes, whereas electrodes activatd with PbS/Ag 2S or CdS/Ag 2S are useless for this purpose. The CuS/Ag 2S 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.
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