Citation: MA Yun-Qi, PENG Zhang-Kuang, CHEN Yan-Jiao, YANG Jian, XIAO Ying-Kai, ZHANG Yan-Ling. High Precise Determination of Bromine Isotopic Ratios by Positive Thermal Ionization Mass Spectrometry Using Static Multicollection of Cs₂Br⁺ Ions[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(2): 186-191. doi: 10.11895/j.issn.0253-3820.150728 shu

High Precise Determination of Bromine Isotopic Ratios by Positive Thermal Ionization Mass Spectrometry Using Static Multicollection of Cs₂Br⁺ Ions

1.
¹ Laboratory of Salt Lake Geology and Environment, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
2.
² Salt Lake Chemical Analyzing and Testing Center, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
3.
³ University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: MA Yun-Qi,
Received Date: 14 September 2015
Available Online: 9 November 2015
Fund Project: 本文系国家自然科学基金项目(Nos.41173019, 41473117) (Nos.41173019, 41473117)中国科学院仪器设备功能开发技术创新项目(No.2016G106) (No.2016G106)中国科学院关键技术人才(2005)项目资助 (2005)

High precise determination of stable bromine isotopic ratios was carried out by thermal ionization mass spectrometer triton with 8 kV accelerating voltage using static multicollection of Cs₂Br⁺ ions. The effect of B and Cl content on the measurement of bromine isotope was studied. The static multicollection method has many advantages, such as, high precision (external accuracy lies between 0.09‰-0.18‰), small amount of sample loading (10-20 μg Br) and short acquisitiotest time (just 8 min for 100 data acquisition). The results showed that the effect of Cl on the measurement of Br isotope ratio increased with the increase of Cl content, and that the presence of B made the determined bromine isotope ratio lower than that without B. The effect of the sample loading sequence on the results of the determined Br isotopic ratio was insignificant. Meanwhile, the Br isotopic composition of four bromide was determined, its δ⁸¹Br was between 0.61‰ and 1.68‰, showing a significant bromine isotope fractionation.
- Bromine isotope,
- Positive thermal ionization mass spectrometry,
- Static multicollection,
- Cs₂Br⁺ ions
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High Precise Determination of Bromine Isotopic Ratios by Positive Thermal Ionization Mass Spectrometry Using Static Multicollection of Cs2Br+ Ions

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High Precise Determination of Bromine Isotopic Ratios by Positive Thermal Ionization Mass Spectrometry Using Static Multicollection of Cs₂Br⁺ Ions