| 高精度正热电离质谱法测定Br同位素 |
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| 引用本文： | 刘卫国,肖应凯.高精度正热电离质谱法测定Br同位素[J].盐湖研究,1993,1(3):57-61. |
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| 作者姓名： | 刘卫国 肖应凯 |
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| 作者单位： | 中国科学院盐湖研究所，中国科学院盐湖研究所，中国科学院盐湖研究所，中国科学院盐湖研究所 西宁 810008，西宁 810008，西宁 810008，西宁 810008 |
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| 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。
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| 关 键 词： | 溴 同位素 质谱 |
The High Precision Isotopic Measurement of Bromine by Thermal Ionization Mass Spectrometry |
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| Liu Weiguo,Xiao Yinkai,Qi Haiping and Zhang Chonggeng.The High Precision Isotopic Measurement of Bromine by Thermal Ionization Mass Spectrometry[J].Journal of Salt Lake Research,1993,1(3):57-61. |
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| Authors: | Liu Weiguo Xiao Yinkai Qi Haiping and Zhang Chonggeng |
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| Abstract: | 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. |
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| Keywords: | Bromine isotopes Mass spectrometry |
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