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为保证硫同位素标准的可靠性与延续性 ,对IAEA S 1硫同位素参考物质和V CDT硫同位素标准的3 2 S/3 4 S绝对比值进行了标定 .用高纯3 2 S/3 4 S同位素试剂以两种不同形式配制了两组人工同位素混合物 ,作为校准物质 .一组用BaSO4混合配制 ,另一组用Ag2 S混合配制 .采用高精密度的SF6法在MAT 2 5 1EM气体同位素质谱计上进行硫同位素分析 .得出IAEA S 1硫同位素参考物质的3 2 S/3 4 S比值为2 2 6 5 6 4± 0 0 0 6 0 ,V CDT的3 2 S/3 4 S比值为 2 2 6 4 96± 0 0 0 6 0 .
In order to ensure the reliability and continuity of the sulfur isotope standard, the absolute ratio of 3 2 S / 3 4 S for the sulfur isotope reference material of IAEA S 1 and the standard for sulfur isotope of V CDT was calibrated. Isotope Reagents Two artificial isotope mixtures were prepared in two different formats as calibrator, one with BaSO4 and the other with Ag2 S. The high-precision SF6 method was used to characterize the relative abundances of MAT isotopes in MAT2 5 1EM gas isotope mass spectrometry Sulfur isotope analysis was carried out and the 3 2 S / 3 4 S ratio of IAA S 1 sulfur isotope reference material was 2 2 6 5 6 4 ± 0 0 6 0 and the V 2 T 3 S ratio of V CDT Is 2 2 6 4 96 ± 0 0 0 6 0.