A primary isotopic gas standard for krypton with values for isotopic composition and molar mass traceable to the Système International d’Unités

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• 作者：Aregbe ; Y. ; Valkiers ; S. ; Poths ; J. ; Nø ; rgaard ; J. ; Kipphardt ; H. ; De Biè ; vre ; P. ; et. al.
• 关键词：Primary isotopic gas standard ; Molar mass ; Isotopic composition ; Gas isotope mass spectrometry ; Isotope amount ratio ; Traceability ; SI ; Krypton
• 刊名：International Journal of Mass Spectrometry
• 出版年：2001
• 出版时间：February 26, 2001
• 年：2001
• 卷：206
• 期：1-2
• 页码：129-136
• 全文大小：147 K

文摘

Isotope amount ratios of krypton were measured on subsamples from one large batch of high purity krypton separated from the atmosphere. Synthetic mixtures of enriched krypton isotopes were used to “calibrate” the measurements with small uncertainties. The result is a primary isotopic gas standard (PIGS) IRMM-2030 with certified values for isotope ratios, isotopic composition, and molar mass of krypton with small combined uncertainties u_c, evaluated according to the ISO/BIPM Guide (GUM). It is commercially available from IRMM-Geel or from MESSER (Duisburg, D). The certified krypton isotope amount ratios in the PIGS IRMM-2030 are as follows: n(⁷⁸Kr)/n(⁸⁴Kr)=0.006 232 5(55), n(⁸⁰Kr)/n(⁸⁴Kr)=0.040 107(17), n(⁸²Kr)/n(⁸⁴Kr)=0.203 43(12), n(⁸³Kr)/n(⁸⁴Kr)=0.201 79(11), and n(⁸⁶Kr)/n(⁸⁴Kr)=0.303 205(59) with expanded uncertainty U