摘要
本文对Cs_2Br^+正热电离质谱分析法测定Br同位素进行了研究,通过实验建立了最佳分析条件,将样品涂在加有石墨的钽带上,能使由CsBr发射出的Cs_2Br^+离子强度大为增加,对化学试剂KBr中Br同位素丰度比的测定值为1.02654±0.00012,其精度为0.011%(95%的置信水平),测定结果表明:几种不同来源的溴化物中,Br同位素存在可观察的差异。
A procedure for the determination of the bromine isotopic ratio by using positive thermal ionization mass spectrometry of the Cs_2Br^+ ion has been investigated. The intensity of Cs_2Br^+ emitted from CsBr is considerably enhanced by the addition of graphite to the filament substrate during loading. Optimal conditions for measurement have been established. The bromine isotopic compositions. ^(79)Br/^(81)Br. in KBr chemical reagents have been measured to be 1.02654±0.00012 with a precision of 0.011%(95% confidence Limit). The Isotopic ratios of bromine in bromides of the different origins hay also been measured and a significant variance of bromine isotopic composition has been observed.
出处
《盐湖研究》
CSCD
1993年第3期57-61,共5页
Journal of Salt Lake Research
关键词
溴
同位素
质谱法
精度
盐湖
Bromine isotopes, Mass spectrometry