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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~(-4)M范围内均适用,相对误差≤±0.8％,变动系数≤0.9％。
The mixture of cadmium, calcium and magnesium ions can be determined according to the stability constants of their complexes with EDTA and EGTA by using cadmium ion selective electrode. The content of cadmium, calcium and magnesium is determined respectively by potentiometric titration. In this paper, the suitable conditions for the determination of three components were discussed, and the waste water and waste liquid were determined. Compared with the classical method, the results were consistent. The concentrations of cadmium, calcium and magnesium ions are all suitable within the range of 1.0 × 10-1 to 1.0 × 10-4 M, the relative error is less than or equal to ± 0.8% and the variation coefficient is less than or equal to 0.9%.