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光度法测定某些金属离子催化K_4Fe(CN)_6与水的取代反应的动力学分析已有报道,但干扰较多,灵敏度低。用氰离子选择电极的电位动力学法测定Hg~(2+)、Au~(3+)已有研究。本文探讨了对银离子的测定,发现在一定条件下银离子浓度与电位值的变化有线性关系,线性范围在2.5×10~(19)～8.0×10~(-8)mol/L。此法干扰较少,灵敏度高。同时对该反应的机理也进行了初步探讨。
Kinetic analysis of the substitution reaction of K_4Fe (CN) 6 with water by some metal ions has been reported by spectrophotometry, but the interference is more and the sensitivity is lower. Potentiodynamic Determination of Hg ~ (2 +) and Au ~ (3 +) by Cyanide Ion Selective Electrode. In this paper, the determination of silver ion was investigated. It was found that there was a linear relationship between the silver ion concentration and the change of potential under certain conditions. The linear range was 2.5 × 10 ~ (19) ~ 8.0 × 10 ~ (-8) mol / L. This method less interference, high sensitivity. At the same time, the reaction mechanism was also discussed.