Key comparison evaluates measurement capabilities for BTEX compounds in nitrogen, indicating NMIs' performance standards.
Main text The CCQM-K10.2018.1 key comparison aimed to compare the measurement capabilities of national metrology institutes (NMIs) in measuring amount fractions of BTEX (benzene, toluene, ethylbenzene, p-xylene, m-xylene and o-xylene) in nitrogen at 5 nmol.mol -1 as described in the CCQM-K10.2018 comparison. The link with the results in CCQM-K10.2018 is provided through the use of a comparison gas provided by NPL who participated in CCQM-K10.2018 and had a satisfactory performance. In the CCQM-K10.2018.1 comparison the gas mixture provided by NPL contains the same compounds (BTEX) at the same nominal amount fractions (5 nmol.mol -1 ) than those of NPL's gas mixture used in the last CCQM-K10.2018 comparison. Therefore NPL values used in the CCQM-K10.2018.1 comparison can be considered as equivalent to the KCRVs in CCQM-K10.2018 comparison. The participants' measurements took place from May 2023 to February 2024. 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 https://www.bipm.org/kcdb/ . The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
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Macé et al. (2025) studied this question.
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