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目前电位溶出法常用的工作电极为汞膜电极,常用的氧化剂为溶解氧或汞(Ⅱ)和铬(Ⅵ)。在伏安溶出法中,采用金膜电极仅用于碲、砷、汞、锗等离子的测定,在电位溶出法中也有报导,但就地镀金膜电极电位溶出法尚未见记载。我们经过研究,成功地采用就地镀金的金膜电极对铜、铋、锑、铅进行了测定,蓝对该方法的机理进行了定量推导和探讨。本文进一步用就地镀金膜电极对锡进行了测定,溶液中的Sn(Ⅳ)和Sn(Ⅱ)首先被还原富集于金膜
At present, the working electrode commonly used for potential dissolution is the mercury electrode, and the commonly used oxidant is dissolved oxygen or mercury (Ⅱ) and chromium (Ⅵ). In voltammetry, the gold electrode is used only for the determination of tellurium, arsenic, mercury and germanium ions. It has also been reported in the potential stripping method, but in situ gold electrode electro-potential stripping has not been reported. After researching, we successfully measured the copper, bismuth, antimony and lead with the gold-plated gold electrode in situ. The blue mechanism of the method was quantitatively deduced and discussed. In this paper, tin was further measured by in-situ gold-plated film electrode. The Sn (Ⅳ) and Sn (Ⅱ) in the solution were firstly reduced and enriched in Au film