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The preparation approach and calibration result of an improved type of ion selective electrode (ISE), which is used to measure the total dissolved S2-, are introduced in this paper. The improved Ag/Ag2S electrode uses silver wire as the substrate, which is surrounded by electric polymer containing superfine silver powder. After the stabilization of the epoxy-resin, Ag2S layer was formed by chemical reaction with 0.2 mol/L (NH4)2S solution for 5 min. With Ag/AgCl as reference electrode, the Ag/Ag2S electrode can be used to measure dissolved S2-. The correlation between the measured potentials and the logarithm of dissolved S2-is found to be linear, within range of the concentration of dissolved S2-from 10-2～10-7 mol/L. The slope of the regression line between measured potential and logarithm of dissolved S2-is about-27.7, which agrees well with the theoretical Nernst value-29.6. Furthermore, the performance of the improved Ag/Ag2S electrode, such as the response time, sensitivity and stability, greatly outweighs the conventional Ag/Ag2S electrode.
The preparation approach and calibration result of an improved type of ion selective electrode (ISE), which is used to measure the total dissolved S2-, are introduced in this paper. The improved Ag / Ag2S electrode uses silver wire as the substrate, which is After the stabilization of the epoxy-resin, Ag2S layer was formed by chemical reaction with 0.2 mol / L (NH4) 2S solution for 5 min. With Ag / AgCl as reference electrode, the Ag / The correlation between the measured potentials and the logarithm of the dissolved S2-is found to be linear, within the range of the concentration of dissolved S2-from 10-2 to 10-7 mol / L The slope of the regression line between measured potential and logarithm of dissolved S2-is about-27.7, which agrees well with the theoretical Nernst value-29.6. Furthermore, the performance of the improved Ag / Ag2S electrode, such as the response time, sensitivity and stability, greatly outweighs the conventional Ag / Ag2S electrode.