硒同位素测试技术进展及其地质应用

Analytical technique of selenium stable isotope and geological applications

硒同位素作为非传统稳定同位素的重要组成部分,由于具多价态、多质量数、同位素分馏效应大的特点,已成为目前发展最迅速的同位素之一。本文在综合前人研究成果基础上,结合笔者最新的研究成果,对硒同位素的测试技术做了较全面总结,内容包括样品的化学前处理(TCF技术)、在线的氢化物发生器系统、质谱测试技术、参考物质的标定等,并就自然界中硒同位素的组成、分馏机制及应用潜力做了评述。

In the end of past century, with the advent of analytical instruments such as TIMS and MC-ICP-MS, the non-traditional stable isotopes, including Fe, Cu, Zn, Se, Mo, Cr, Hg, Ca, Mg etc., are developing rapidly, and have became a very important research frontier in isotope geochemistry. Because of the special feature with the multivalences, multi-mass number and larger isotopic fractionation, Se isotopes have caused more attention. Se isotope research to date has confirmed these measurements, developed new t techniques, and investigated Se isotope fractionation during several other critical processes. In this paper, we summarize the chemical preparation （TCF）, on-line hydride generation system, mass spectrometry, scaling of standard reference materials concerning Se isotopes, and review the isotopic compositions and fractionation mechanism in natural and the experiments.