用AGMP-1M阴离子交换树脂直接分离Zn的实验方法改进

针对原有用于铜、铁、锌同位素分析的提纯步骤方法,我们专门对锌的提纯进行了改进,即在1mol/LHCl的介质条件下,采用200~400目AGMP-1M树脂提纯锌,大大简化了锌的提纯方法。在改进的实验条件下,地质样品的回收率接近100%;标准溶液在离子交换分离前后同位素组成一致,表明分离前后无Zn同位素分馏;全流程Zn的空白小于0.7ng/mL。此法可作为用于高精度Zn同位素分析的前处理方法。

The Improved Method for Purifying Zn Directly by Using AGMP-1M Resin

This work has improved the purification method of Zn, by modifying the previous sequential purification methods of Cu, Fe, and Zn for isotopic composition measurement. In the improved method, the resin AGMP-1M (200~400 mesh, Bio-Rad) was used to purify Zn by loading sample solution in 1 mol/L HCl. We had nearly 100% of recovery for Zn in geological samples. The standard solution was used to check the isotope fractionation possibly occurring in the separation procedure, and the result showed the same isotope compositions of the standard solution before and after the separation processes. This method is simpler as compared to previous one and can be applicable to separation of Zn in geological samples for high-precision isotope analysis.