氯同位素质谱法测定进展  

The Progress of the Procedure for Isotopic Measurement of Chlorine by Mass Spectrometry

作　　者：孙爱德[1] 肖应凯[1] 

机构地区：[1]中国科学院青海盐湖研究所,青海西宁810008

出　　处：《盐湖研究》2002年第3期45-50,共6页Journal of Salt Lake Research

摘　　要：主要总结了测定氯同位素比值的四种质谱法 :由电子轰击产生的基于HCl+离子的气体质谱法、基于CH3 Cl+离子的气体质谱法、基于Cl-离子负热电离质谱法 (NTIMS)和基于Cs2 Cl+离子正热电离质谱法(PTIMS)。并分析了使用这四种方法测定氯同位素时处理含氯样品和使用仪器测定样品氯同位素的方法及其优缺点 ,对测定结果的精度进行了比较 ,最后对测定氯同位素发展前景进行了展望。In this article,four kinds of determination methods of chlorine isotope ratios by mass spectrometry were discussed:the mass spectrographic determination of the ions produced in HCl + under electron impact;the mass spectrographic determination of the ions produced in CH 3Cl + under electron impact;negative thermal ions mass spectrometry and positive thermal ions mass spectrometry.The pretreatments of the samples and mass spectrometric measurement processes as well as their strong points and shortcomings were analyzed for these four methods.And the precisions of the results were compared.At last an outlook was given for the measurement of chlorine isotopic ratio.

关 键 词：质谱法 氯同位素 地球化学 电子轰击 负热电离质谱法 

分 类 号：P597[天文地球—地球化学]