络合滴定法对EDTA和NTA混合体系中二者含量的分别测定

Determination of EDTA and NTA in Mixture by Complexometric Titration

建立了EDTA、NTA混合体系中二者含量的络合滴定检验法。在pH =3.5时 ,以钛铁试剂为指示剂 ,用铁离子滴定EDTA和NTA的总和 ,在pH =6时 ,用铁离子滴定EDTA的含量 ,二次滴定的差值即为NTA的含量。该方法快速简便 ,准确度高 ,是对GB1 41 0的补充和完善 ,尤其适用于生产的现场控制分析。

A method of determination of EDTA and NTA in mixture by complexometric titration is described in this paper. The total comount of EDTA and NTA is determined in a buffer medium of pH=3.5 by titration with Fe 3+ using titanic iron reagent as indicator。The EDTA content is determined in a buffer medium of pH=6. The NTA content is obtainted by difference. The method is proved to be simple and rapid, good in sensetivity and accuracy. It is complement to GB 1410.