Cd同位素地质样品的预处理方法研究

Chemical Pre-treatment Methods for Measurement of Cd Isotopic Ratio on Geological Samples

考察了文献报道的地质样品中Cd同位素测试前的化学分离纯化和富集方法(预处理方法)中的离子交换树脂单柱法回收率低的原因,并在该方法的基础上做了改进,优化了离子交换柱的洗涤顺序和洗液用量。改进后的离子交换树脂单柱法Cd回收率达99.82%,主要干扰元素(Sn、In、Zn、Pb)和基质元素的去除效果均较理想,能更好地满足Cd同位素的测定要求。

The causes of low-recovery for cadmium（Cd） separated and purified by the ion exchange resin one-column procedures were investigated.Based on the ion exchange resin one-column procedures,a proved method was proposed and the washing procedure and the volume of washing solution was adjusted.The results indicated that the recovery of Cd was up to 99.82%,the potential interferences on Cd isotopes（including Sn,In,Zn,Pb and other interfering matrix elements） were present at negligible levels.The improved method could meet the needs of the measurement of Cd isotopic ratio.