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现有硫化银商品电极由于体积大,不适用于微量滴定。为制备小型的测定硫化物的指示电极,本工作对银基涂Ag_2S丝电极的制备和性能进行了一些研究。把高纯银丝净化处理后,在碱性硫化钠溶液中自发氧化或阳极氧化,在银丝表面涂上一层致密的Ag_2S。实验证明,这样制成的涂Ag_2S丝电极在碱性溶液中对浓度为10~0～10~(-6)M硫化物有良好的能斯特响应,平均级差28.2mV/pS(19℃):在线性响应区内电极的标准电位(E_0)偏差<±1mV;在>10~(-4)M硫化物溶液中电极的响应时间是瞬时的;Cl~-、Br~-、I~-及其他常见
Existing silver sulfide commercial electrode due to the volume, not suitable for microtiter. In order to prepare a small indicator electrode for the determination of sulfide, this work carried out some studies on the preparation and properties of silver-based Ag_2S wire electrode. The high-purity silver purification, spontaneous oxidation in alkaline solution of sodium sulfide or anodic oxidation, the silver surface coated with a layer of dense Ag_2S. The experiment proves that Ag2S wire electrode prepared in this way has a good Nernst response to 10 ~ 0 ~ 10 ~ (-6) M sulfides in alkaline solution with the average step difference of 28.2mV / pS (19 ℃) : The standard potential (E_0) deviation of the electrode in the linear response zone is less than ± 1mV; the response time of the electrode is instantaneous in> 10 ~ (-4) M sulfide solution; And other common