Citation: MA Xue-Hai, MA Yun-Qi, SONG Jian-Guo, CHENG Huai-De, YANG Jian, HAI Qing-Yu, LI Xing-Yi, LI Jun. Three-step Ion Exchange Method for High Precision Determination of Boron Isotope in Nitrate Brine Samples[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(6): 780-785. doi: 10.19756/j.issn.0253-3820.191466 shu

Three-step Ion Exchange Method for High Precision Determination of Boron Isotope in Nitrate Brine Samples

MA Xue-Hai ^1,2,3, ,
MA Yun-Qi ^1,2 ,
SONG Jian-Guo ^1,2,3 ,
CHENG Huai-De ^1,2 ,
YANG Jian ^1,2,3 ,
HAI Qing-Yu ^1,2 ,
LI Xing-Yi ^1,2,3 ,
LI Jun ^1,2,3

1.
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China;
2.
Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining 810008, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 30 July 2019
Revised Date: 6 January 2020

Fund Project: This work was supported by the Key Cultivation Project of Northwest Research Institute and the Special Project of the Ministry of Science and Technology (No. 2012FY112600) and the Technical Innovation Project of Instrument and Equipment Functional Development of Chinese Academy of Sciences (No. 2020g102).

The nitrate (NONO₃^-) will produce a Cs₂CNO⁺ isobaric of Cs₂BO₂⁺ when determining boron isotope of samples containing nitrate by thermal ionization mass spectrometry (TIMS), which reduces the ratio of ¹¹B/¹⁰B in these samples and seriously interferes with the determination of boron isotope. However, the traditional two-step ion exchange method (ie. the first step of boron special effect resin, the second step of anion-cation exchange method) cannot effectively remove NONO₃^-. In this study, the pretreatment process of boron isotope in samples from the natural nitrate-type brine (NONO₃^- content was 1384 mg/L) was carried out. Three-step ion exchange method (ie. adding a step anion resin based two-step method) was used to reduce the content of NONO₃^- in the sample solution and eliminate the influence of NONO₃^- ion in the determination of boron isotope. The results showed that the three-step ion exchange method could further eliminate the content of NONO₃^- compared with the conventional two-step ion exchange method, reducing the interference of the isobaric determination of boron isotope. The recovery of boron in the sample pretreated by the three-step ion exchange method was over 90%, which fully met the requirements of boron isotope determination. In this process, there was no fractionation of boron isotope. This method was suitable for the high-precision boron isotope determination of nitrate-containing brine and effectively shortened the detection time.
- Nitrate ion,
- Boron isotope,
- Isobaric,
- Thermal ionization mass spectrometry
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