负离子热表面电离质谱测定中的铼、锇同位素试样化学分离方法研究

A Study on Re-Os Chemical Separation Method for NTIMS

摘要: 研究建立了适于负离子热表面电离质谱（NTIMS）测定的体、锇同位素试样的化学分离方法。采用碱熔方法分解样品。分离Os采用两次常量蒸馏和一次微量蒸馏。由于微蒸馏技术的应用使离子流强度增加了2个数量级。对Re采用丙酮革取、阳离子交换和微型阴离子交换柱分离纯化，使溶液纯度满足了NTIMS测定Re的要求。对新研制的Re－Os年龄畚考样HLP的年龄测定值为223．4±1．5Ma（2σ），与美国地调局的测定值224．0±2．0Ma（2σ）基本相符。

Abstract: We developed a new Re-Os chemical separation method that is suitable to NTIMS. The method included alkaline fusion, twice distillation,a micro distillation for Os that had lmproved ion-current to 2 magnitudes and extraction, cationexchange, micro anionexchange for Re. The Re-Os age of newly deve1oped Re-Os age reference HLP by this method was 223. 4±1. 5 Ma.