高效液相色谱-催化伏安法测定稀土元素

Determination of Rare Earth Elements by HPLC with Catalytic Voltammetry

报道了Ag(Hg)-Pt-Ag三电极系统,流动型固体电极微电解池作为高效液相色谱的催化伏安检测器,用于Ho、Dy、Tb、Gd四种稀土元素的分离与检测。比较详细地讨论了稀土元素在银汞膜电极上的吸附催化过程,实验证明这是一个络合吸附过程,其检出限可达4μg/L,确定了络合物的络合比。

In this paper, a vohammetric detector using a flowing micro-electrolyzer with Ag（Hg）-Pt-Ag triple electrode system for the determination of rare earth elements by HPLC has been developed. Ho, Dy, Tb, Gd are separated and detected successfully by the system. The adsorption and catalysis processes of rare earth elements on the Ag （Hg） membrane electrodes have been discussed in detail. The results show that it is a complexing adsorption process and the coordination number of the complex is also determined. The detection limits for rare earth elements are 4μg/L.