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用动力催化反应测钴的方法一直受到注意,见于报道的指示反应已有几十种,其中多数是H_2O_2+有机还原剂,且均系用光度法测定。由于催化这类反应体系的元素很多,干扰较严重。在2,2′一联吡啶存在下,钴对亚铁氰化钾的水合反应有很强的催化作用,有人用光度法测定了微量钴。本文研究了以氰离子选择电极测定钴的实验条件,采用固定时间法和离子选择电极监测反应产物,可测定微量钴。线性范围为0.001—0.01μg/ml。主要干扰离子可通过反相萃取色层分离除去。本法操作简便、快速、灵敏,已成功用于矿样中微量钴的测定。
The method of kinetic catalytic reaction for the determination of cobalt has been noticed. There are dozens of reported reaction reactions, most of which are H 2 O 2 + organic reducing agents, and all are determined by spectrophotometry. Due to the large number of elements that catalyze such reaction systems, the interference is more serious. In the presence of 2,2’-bipyridyl, cobalt has a strong catalytic effect on the hydration reaction of potassium ferrocyanide. Some people used spectrophotometry to measure the trace amounts of cobalt. In this paper, the experimental conditions for the determination of cobalt by a cyanide selective electrode were studied. The reaction products were monitored by a fixed time method and an ion-selective electrode to measure trace amounts of cobalt. The linear range is 0.001-0.01 μg / ml. The main interfering ions can be removed by reverse-phase chromatography. This method is simple, rapid, sensitive, and has been successfully used for the determination of trace cobalt in ore samples.