多元线性回归pH配位滴定法同时测定钙和镁

CHELATOMETRIC pH TITRATION OF CALCIUM AND MAGNESIUM BY THE MULTIPLE LINEAR REGRESSION METHOD

将多元线性回归分析应用于pH配位滴定,提出△lgK_(MY)较小金属离子混合溶液中各组分同时测定的方法,讨论了方法的原理、回归方程和最佳条件.对钙、镁合成样品及实际水样中钙、镁含量进行测定,结果满意.

It is reported that a new method of chelatometric pH titration of calcium and magnesium simulta-neously in a mixed solution by applying the multiple linear regression method is established. In spite of the fact that there is only a small difference between the stability constants of the chelates of Ca2+ and Mg2+ with EDTA (AlgK?),the analysis can be done without separation or masking, and the results obtained from the analysis of some simulated samples are quite satisfactory.