Mikulski and co-workers' 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 pretreatment.2-6. A previous study of the response of (SN), electrodes to pH also mentioned7 that the (SN), electrode responds to silver(1) and mercury(I1) ions if present in significant concentration in the test solution. However, the potential response of the (SN), electrode to pH did not appear to be Nernstian. In this paper we describe the pAgpotential response of the (SN), electrode under controlled conditions and the selectivity and the potentiometric titration response of the (SN), electrode, with or without chemical pre-treatment, to silver(1) ions. The (SN), electrode responses are compared with those of a commercial Ag -AgzS selective electrode.
Experimental ReagentsAll chemicals used in this study were of analytical-reagent grade and were used without further purification. The water used in the preparation of all solutions was purified by passing it through a N A N 0 pure deionisation system (Barnstead Co.,
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