【摘要】 镉、钙、镁三种离子的混合物可根据它们与EDTA、EGTA所形成配合物稳定常数的不同,利用镉离子选择电极作指示,电位滴定法分别测定其含量。本文探讨了三种组份测定的适宜条件,并对废水、废液进行了测定,与经典方法相比,结果一致。镉、钙、镁离子浓度在1.0×10^-1～1.0×10^-4M范围内均适用,相对误差≤±0.8％,变动系数≤0.9％。更多还原

【Abstract】 The amount of mixtures of cadmium, calcium and magnesium ions was determined by the potentionmetric titration with cadmium ion-selective electrode. This method utilizes the difference of the formation constants of the complexes of these ions and disodium ethylenediaminetetraacetate, glycoletherdiaminetetraacetic. This paper researches on the determination method and the using condition. Several water samples were determined. The best results with relative error less than±0.8% and relative standard deriation less than 0.9% were obtained on 1×10-4M solution of mixed ion.更多还原