Abstract
The composition of natural gas is one of the significant objects for comparison study. Since 2000 three key comparisons of natural gas within CCQM have been implemented: CCQM-K1e-g, CCQM-K16a-b and CCQM-K23a-c.In 2007 VNIIM offered to organize within COOMET a key comparison of natural gas linked to CCQM-K23b. There were five NMIs that decided to take part in COOMET.QM-K23b in order to claim new or improve present CMCs: Ukrmetrteststandard (Ukraine), BelGIM (Belarus), BAM (Germany), SMU (Slovak Republic) and CMI (Czech Republic). Most of the NMIs (VNIIM, BAM, SMU, CMI) participated in CCQM-K23b; BelGIM and Ukrmetrteststandard participated in a comparison of natural gas for the first time.The gas mixtures for study contained nitrogen, carbon dioxide, ethane, propane, iso-butane, n-butane and methane. The key comparison reference value (KCRV) was based on the gravimetric preparation for all components.In order to determine the link between COOMET.QM-K23b and CCQM-K23b the uncertainty of degrees of equivalence of all the participants included the degree of equivalence of VNIIM in CCQM-K23b.The agreement of the results in this key comparison is very good. Most of the results agree with the KCRV within 0.5% relative. BelGIM and Ukrmetrteststandard participated in a comparison of natural gas for the first time, and both laboratories performed well in this key comparison. CMI obtained better results than in CCQM-K23b.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).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
