分析化学2017，Vol.45Issue(3)：342-347,6.DOI:10.11895/j.issn.0253-3820.160840
激光共振电离质谱法测量锡的同位素比
Measurement of Tin Isotope Ratios by Laser Resonance Ionization Mass Spectrometry
摘要
Abstract
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 1μg 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 116 Sn/ 120 Sn, 117 Sn/ 120 Sn, 118 Sn/ 120 Sn, 119 Sn/ 120 Sn 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 121m Sn and 126 Sn in the reactor spent fuel.关键词
激光共振电离质谱/锡/同量异位素干扰/同位素比/元素选择性Key words
Laser resonance ionization mass spectrometry/Tin/Isobaric interference/Isotope ratio/Element selectivity引用本文复制引用
沈小攀,李志明,王文亮,翟利华,邓虎,徐江,韦冠一,汪伟..激光共振电离质谱法测量锡的同位素比[J].分析化学,2017,45(3):342-347,6.基金项目
本文系国家重大科学仪器设备开发专项项目(No. 2012YQ250003)资助 This work was supported by the National Major Scientific Instruments and Equipments Special Project (No. 2012YQ250003 （No. 2012YQ250003）
