Rob M Wessel et al 2008 Metrologia 45 08011 doi:10.1088/0026-1394/45/1A/08011
Rob M Wessel1, Adriaan M H van der Veen1, Paul R Ziel1, Paul Steele2, Ray Langenfelds2, Marcel van der Schoot2, Damian Smeulders3, Laurie Besley3, Valnei Smarçao da Cunha4, Zeyi Zhou5, Han Qiao5, Hans Joachim Heine6, Belén Martin7, Tatiana Macé8, Prabhat K Gupta9, Elena Amico di Meane10, Michela Sega10, Francesca Rolle 10, Masaaki Maruyama11, K Kato12, N Matsumoto12, Jin Seog Kim13, Dong Min Moon13, Jin Bok Lee13, Francisco Rangel Murillo14, Carlos Ramírez Nambo14, Víctor M Serrano Caballero14, Manuel de Jesús Avila Salas14, Alejandro Pérez Castorena14, L A Konopelko15, Y A Kustikov15, A V Kolobova15, V V Pankratov15, O V Efremova15, Stanislav Musil16, Frantisek Chromek16, Miroslava Valkova16, Martin J T Milton17, Gergely Vargha17, F Guenther18, Walter R Miller18, Angelique Botha19, James Tshilongo19, Ipeleng S Mokgoro19 and Nompumelelo Leshabane19
Show affiliationsThe first key comparison on carbon dioxide in nitrogen dates from 1993–1994 (CCQM-K1.b). Since then, numerous national metrology institutes (NMIs) have been setting up facilities for gas analysis, and have developed claims for their Calibration and Measurement Capabilities (CMCs) for these type mixtures. In the April 2005 meeting of the CCQM Gas Analysis Working Group, a policy was proposed to repeat key comparisons for stable mixtures every 10 years. Consequently in 2007 the key comparison CCQM-K52 'Carbon dioxide in synthetic air' was carried out. This comparison is consistent with the proposed policy and enables NMIs that could not participate in the previous comparison to take part.
This report describes the results of a key comparison for carbon dioxide in synthetic air. The amount-of-substance fraction level of carbon dioxide chosen for this key comparison (360 µmol/mol) represents the ambient level of this component in air.
In total 18 NMIs and one WMO laboratory participated in the comparison. The agreement of the results in this key comparison is very good. With a few exceptions, the results agree within 0.3% (or better) with the key comparison reference value.
Most of the participants that did not participate in CCQM-K1.b do very well. In some cases, the uncertainties claimed are quite large in comparison with the NMIs for which this comparison is a true 'repeat', but the observed differences with the KCRV usually reflect that these claims are realistic. All participants in CCQM-K1.b that participated in this key comparison show improved results.
Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
Issue 1A ( 1 January 2008)
Rob M Wessel et al 2008 Metrologia 45 08011
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