Brewer, P J; Brown, R J C; Lee, S; van der Veen, A (2026) Twenty-Five Years of CIPM-CCQM Gas Analysis Key Comparisons. Analytical Chemistry, 98 (7). pp. 5691-5698. ISSN 0003-2700

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Abstract

International key comparisons under the International Committee for Weights and Measures’ Mutal Recognition Arrangement (CIPM-MRA) provide the means to assess the equivalence of measurement standards and the comparability of calibration and measurement capabilities at National Metrology Institutes and Designated Institutes around the world. They also provide a snapshot of the state of the art in measurement science in terms of the realisation of the definition of SI units, and vital insights on where to focus future efforts to advance metrology. In the last 25 years, the Gas Analysis Working Group of the Consultative Committee for Amount of Substance: Chemistry and Biology has coordinated 46 key comparisons, resulting in a wealth of data. From these data, we present a classification of the target components by difficulty, how the state of the art has changed since the working group was established and the changes in performance of a selection of NMIs.

Item Type:	Article
Subjects:	International > Metrology
Divisions:	Atmospheric Environmental Sciences
Identification number/DOI:	10.1021/acs.analchem.5c07630
Last Modified:	18 Sep 2026 14:03
URI:	https://eprintspublications.npl.co.uk/id/eprint/10541