三氯偶氮胂速差动力学分析法测定Gd、Y二元混合物中的单一稀土

The Determination of Individual Rare Earth in the Binary Mixture of Gd and Y by Rate Differential Kinetic Method

本文研究了稀土的三氯偶氮胂络合物与CyDTA取代反应的动力学行为,测定了反应体系的部分动力学参数,建立了动力学测定方程,利用pH3.0时,Gd、Y的三氯偶氮胂络合物与CyDTA取代反应的速率差别,采用对数外推法测定了Gd、Y二元稀土混合物中的各组份,该方法灵敏度高、准确、简便、快速。

The kinetic behaviour in the substitution reaction of RE(TCA)_(2)(TCA=2-(2-arsenophenylazo)-7-(2,4,6-trichlorophenylazo)-1,8-dihydroxynaphthalene-3,6-di-sulfonic acid)with CyDTA has been studied,and some kinetic parameters of the reaction system and kinetic equation for determination have been measured and established.Gd and Y in the binary mixture have been determined by their rate difference in the ligand substitution reaction of RE(TCA)_(2)with CyDTA at pH3.01.A number of synthesized samples was analysed by logarithmic extrapolation method with good sensitivity and high precision,and it is simple and rapid.