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The Ion-selective Behaviour of The Polymeric Sulfur Nitride Electrode for The Measurements of Silver(I)

Mikulski and co-workers1 reported that polymeric sulphur nitride, (SN)^, which has metallic conducting properties, can be prepared in an analytically pure form as well defined single crystals. Recently, (SN)^ has been examined with respect to its properties as an electrode material for voltammetric measurements in aqueous media with or without chemical pre-treatment.2-6. A previous study of the response of (SN)X electrodes to pH also mentioned7 that the (SN)A electrode responds to silver(I) and mercury(II) ions if present in significant concentration in the test solution. However, the potential response of the (SN)X electrode to pH did not appear to be Nemstian. In this paper we describe the pAg - potential response of the (SN)X electrode under controlled conditions and the selectivity and the potentiometric titration response of the (SN)X electrode, with or without chemical pre-treatment, to silver(I) ions. The (SN)X electrode responses are compared with those of a commercial Ag - Ag2S selective electrode.

silver(l) measurement ; ion-selective electrode ; polymeric sulphur nitride electrode ; potentiometry ; mercury(ll)

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