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研究了pH为 5 0的醋酸 醋酸钠介质中存在大量锌时 ,镉和钴在丁二酮肟 柠檬酸钠 氯化铵体系中的络合物吸附波 .结果表明 ,镉、钴峰电位分别为 - 0 79V和 - 0 93V ,线性范围分别为 0 0 0 5～ 5mg·L- 1 和 0 0 0 0 1～ 0 1mg·L- 1 ,检测限分别为 4 0× 1 0 - 8mol·L- 1 和 8 1× 1 0 - 1 0 mol·L- 1 .该方法具有不经预处理可直接用于锌电解液中微量镉、钴同时测定的优点 .分析了电活性络合物的组成、极谱波性质和电极过程机理 .镉、钴与丁二酮肟 (DMG)的络合比均为 1∶2 ,Cd(DMG) 2 和Co(DMG) 2 络合物均表现出强的吸附特性 ,且前者吸附性更强 ,峰电流主要由络合物中心离子Cd(Ⅱ )和Co(Ⅱ )还原为Cd和Co产生 ,极谱波均为络合物吸附波
The complex adsorption wave of cadmium and cobalt in dimethylglyoxime sodium citrate and ammonium chloride system was studied in the presence of a large amount of zinc in a sodium acetate acetate solution at a pH of 50.The results showed that the peak potentials of cadmium and cobalt were - 0 79V and - 0 93V respectively. The linear range was 0 0 0 5 ~ 5 mg · L -1 and 0 0 0 0 1 ~ 0 1 mg · L -1, respectively. The limits of detection were 4 0 × 10 ~ 8 mol·L -1, 1 and 8 1 × 10 ~ 10 mol·L -1 .The method has the advantages of simultaneous determination of trace amounts of cadmium and cobalt in zinc electrolyte without pretreatment.The composition of the electroactive complex, Polarographic wave properties and electrode process mechanism.The complex ratios of cadmium, cobalt and dimethylglyoxime (DMG) were both 1: 2, and both Cd (DMG) 2 and Co (DMG) 2 complexes showed strong adsorption And the former is more adsorbable. The peak current is mainly produced by the reduction of Cd (Ⅱ) and Co (Ⅱ) ions of the complex to Cd and Co, and the polarographic waves are all complex adsorption waves