热电离质谱法测定锂同位素的研究进展

The Development of Determination of Lithium Isotope by the Method of Thermal Ionization Mass Spectrometry 

中文关键词:  锂同位素  热电离质谱  分馏效应

英文关键词:Lithium isotope  TIMS  Isotopic fractionation

中文摘要:

      锂的两种稳定同位素⁶Li和⁷Li存在很大的相对质量差,质量分馏效应十分明显,因此要精确地测定锂同位素比值十分困难。近年来,随着质谱测定方法的发展,锂同位素的测定取得了长足进展。目前,使用热电离质谱仪(TIMS)和多接受电感耦合等离子质谱仪(MC-ICP-MS)测定锂同位素比值的较多。TIMS相比于MC-ICP-MS,其测定精度较高。主要对使用热电离质谱仪(TIMS)测定锂同位素进行了详细的介绍,主要包括带材料和带结构、涂样形式以及电离温度这3方面的研究进展,并指出了此方法存在的一些问题。

英文摘要:

      :There exists great gap in mass quality between the two stable lithium isotopes ⁶Li and ⁷Li, the fractionation is very obvious.Therefore, it is very difficult to determine lithium isotopic ratios precisely.In recent years,the determination of lithium isotope have made a great progress as the development of mass spectrometry.At present,the lithium isotope is mainly measured by thermal ionization mass spectrometry and multi-collector inductively coupled plasma mass spectrometry, the accuracy of determination by TIMS is higher than MC-ICP-MS.This paper mainly introduces the determination of lithium isotope by TIMS in detail,including the development of the materials and structure of filament,loading material and the temperature of ionization,and the existence problems also present.