地质样品的一次阴离子色谱法Hf分离及其MC-ICP-MS分析

One column procedure for Hf purification in geological samples using anion exchange chromatography and its isotopic analyses by MC-ICP-MS

本文建立了适合MC-ICP-MS测试地质样品中Hf同位素的一次阴离子交换化学分离方法。使用常规的阴离子交换树脂就可以完成Hf与干扰元素和基体元素的分离,避免了当前广泛采用的多次离子交换柱的麻烦,也无需使用特效树脂,HF处理样品后,也不必使用HClO_4赶尽HF。Hf的回收率大于90%,过程空白约为50pg。岩石标样的重复分析表明,该方法简单、快速、经济、有效,尤其适合年轻地质样品Hf同位素组成分析。

Abstract A one-column procedure for Hf purification in geological samples using anion exchange chromatography and its isotopic analyses by MC-ICP-MS was developed in this paper. The chemical separation between Hf and isobaric elements such as Lu, Yb and matrix materials like Ti was carried out simultaneously through popular anion exchange chromatography. This technique avoids using popular multiple ion exchange chromatography, special extraction chromatographic resins and perchloric acid to break down Hf and REE fluorides after HF dissolved the rock. Hf yields are〉 90% and total procedural blanks are ca. 50pg. Multiple analyses of Standard Reference Materials demonstrate that this method was simple, time-saving, inexpensive and efficient, especially suitable for the Hf isotopic composition of young samples.