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Abstract: 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.

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