Title: International Comparison CCQM-K51 - Carbon Monoxide (CO) in Nitrogen (5 µmol mol-1)
Authors: BOTHA AngeliqueJANSE VAN RENSBURG MellisaTSHILONGO JamesLESHABANE NompumeleloNTSASA NapoKATO KenjiMATSUMOTO NobuhiroSTUMMER VolkerKONOPELKO L AKUSTIKOV Y APANKRATOV V VVASSERMAN I IZAVYALOV C VGROMOVA E VUPRICHARD IanVARGHA GergelyMARUYAMA MHEINE Hans-JoachimRANGEL MURILLO FranciscoSERRANO CABALLERO Victor M.PÉREZ CASTORENA AlejandroMACE TatianaGUENTHER FrankMILLER WalterROJO AndresFERNANDEZ TeresaCIECIORA DariuszCUNHA Valnei SRIBEIRO Claudia CAUGUSTO Cristiane RQIAO HanZHOU ZeyiSMEULDERS DamianGERBOLES MichelKAPUS MatejWESSEL RobDIAS FlorbelaBAPTISTA GonçalaoGUPTA Prabhat KJOHRI P.LAONGSRI BunthoonSINWEERUTHAI RatiratNIEDERHAUSER BernhardACKERMANN AndreasFROEHLICH MarinaWOLF AndreasLEE JeongsoonMUSIL StanislavVALKOVA MiroslavaWALDEN JariLAURILA Sisko
Citation: METROLOGIA vol. 47 no. 1A p. 1-97
Publisher: IOP PUBLISHING LTD
Publication Year: 2010
JRC Publication N°: JRC62817
ISSN: 0026-1394
URI: http://www.bipm.org/utils/common/pdf/final_reports/QM/K51/CCQM-K51.pdf
http://publications.jrc.ec.europa.eu/repository/handle/JRC62817
DOI: 10.1088/0026-1394/47/1A/08008
Type: Articles in Journals
Abstract: The first key comparison on carbon monoxide (CO) in nitrogen dates back to 1992 (CCQM-K1a). It was one of the first types of gas mixtures that were used in an international key comparison. 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 mixtures. Furthermore, in the April 2005 meeting of the CCQM (Consultative Committee for Amount of Substance) Gas Analysis Working Group, a policy was proposed to repeat key comparisons for stable mixtures every 10 years. This comparison was performed in line with the policy proposal and provided an opportunity for NMIs that could not participate in the previous comparison. NMISA from South Africa acted as the pilot laboratory. Of the 25 participating laboratories, 19 (76%) showed satisfactory degrees of equivalence to the gravimetric reference value. The results show that the CO concentration is not influenced by the measurement method used, and from this it may be concluded that the pure CO, used to prepare the gas mixtures, was not 13C-isotope depleted. This was confirmed by the isotope ratio analysis carried out by KRISS on a 1% mixture of CO in nitrogen, obtained from the NMISA. There is no indication of positive or negative bias in the gravimetric reference value, as the results from the different laboratories are evenly distributed on both sides of the key comparison reference value.
JRC Institute:Institute for Environment and Sustainability

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