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本文报告了以 Ag_2S 为指示电极 LaF_3为参比电极的全固态 Ag_2S 复合电极的装配及电极对 Ag~+、S~(2-)、I~-、CN~-的响应性能,并用该电极进行自动电位滴定,测定了各种镀液中的游离 CN~-。由于氟电极消除了液接电位,且受其他离子干扰小,故参比电极电位比甘汞电极稳定。该复合电极结构紧凑、使用方便、性能良好,测定 Ag~+、S~(2-)、I~-、CN~-的灵敏度较高(线性范围:Ag~+5×10~(-8)～1×10~(-1)M,S~(2-)3×10~(-8)～1×10~(-1)M,I~-4×10~(-8)～1×10~(-2)M,CN~-4×10~(-7)～1×10~(-2)M)。用于自动电位滴定法滴定 CN~-,终点电位稳定,方法简便、快速、准确,适合小体积试液的测定,在电镀液分析中是一个可供选择的方案。
In this paper, the assembly of all-solid Ag_2S composite electrode with Ag_2S as the reference electrode and reference electrode of the indicator electrode LaF_3 and the response of the electrode to Ag ~ +, S ~ (2 -), I ~ -, CN ~ Automatic potentiometric titration, determination of a variety of bath free CN ~ -. As the fluorine electrode eliminates the liquid junction potential, and interference by other ions is small, so the reference electrode potential than calomel electrode stability. The composite electrode has the advantages of compact structure, convenient use and good performance. The determination of Ag ~ +, S ~ (2 -), I ~ - and CN ~ - has high sensitivity in the range of Ag ~ + 5 × 10 ~ ~ 1 × 10 ~ (-1) M, S ~ (2-) 3 × 10 -8 ~ 1 × 10 -1 M, I ~ -4 × 10 -8 ~ 1 × 10 ~ (-2) M, CN ~ -4 × 10 -7 ~ 1 × 10 -2 M). It is used for the titration of CN ~ - by potentiometric titration. The end potential is stable. The method is simple, rapid, accurate and suitable for the determination of small volume of test solution. It is an alternative solution in electroplating solution analysis.