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Citation: SHEN Xiao-Pan, LI Zhi-Ming, WANG Wen-Liang, ZHAI Li-Hua, DENG Hu, XU Jiang, WEI Guan-Yi, WANG Wei. Measurement of Tin Isotope Ratios by Laser Resonance Ionization Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(3): 342-347. doi: 10.11895/j.issn.0253-3820.160840 shu

Measurement of Tin Isotope Ratios by Laser Resonance Ionization Mass Spectrometry

Northwest Institute of Nuclear Technology, Xi'an 710024, China

Received Date: 18 November 2016
Revised Date: 26 December 2016

Fund Project: This work was supported by the National Major Scientific Instruments and Equipments Special Project (No.2012YQ250003)

A preliminary method based on the laser resonance ionization mass spectrometer (LRIMS) developed in the laboratory was established to determine tin isotope ratios. By measuring the auto-ionization spectrum of tin atoms, a three-color-three-photon resonance ionization scheme was confirmed, and the laser wavelengths of each excitation/ionization step were λ₁=286.4 nm, λ₂=811.6 nm and λ₃=823.7 nm. More effective electrothermal atomization of tin was implemented by mixing the samples and grapheme oxide solution, and the total detection efficiency of 1 μg of tin sample was above 3×10^-5, which was about 4.5 times as high as the method of directly dropping samples. A tin-antimony-tellurium mixture at a ratio of 1:1:1 (m/m) was prepared as a simulant sample, and the major tin isotope ratios in the sample were determined. Results showed that the isobaric interference from antimony and tellurium was effectively avoided, and the relative standard deviations for ¹¹⁶Sn/¹²⁰Sn, ¹¹⁷Sn/¹²⁰Sn, ¹¹⁸Sn/¹²⁰Sn, ¹¹⁹Sn/¹²⁰Sn were all better than 1%. This work indicated that LRIMS could effectively avoid the isobaric interference in the measurement of tin isotope ratios, and could be applied to measure the fission product ^121mSn and ¹²⁶Sn in the reactor spent fuel.
- Laser resonance ionization mass spectrometry,
- Tin,
- Isobaric interference,
- Isotope ratio,
- Element selectivity
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