Carbon monoxide (CO) in nitrogen was one of the first types of gas mixtures used in an international key comparison. This comparison dates back to 1998 (CCQM-K1a) [1]. Another key comparison on carbon monoxide is the CCQM-K51 at the lower amount fraction of 5 μmol/mol. Since then, many National Metrology Institutes (NMIs) have developed Calibration and Measurement Capabilities (CMCs) for these mixtures. Recently, NMIs in the APMP region have actively participated in international comparisons to provide domestic services. At the 2017 APMP meeting, several NMIs requested a CO comparison to establish CO/N₂ certification for supporting industrial needs, which was to be coordinated by KRISS. Consequently, this supplementary comparison provides an opportunity for APMP regional NMIs to meet their industrial needs. It is a replica of APMP.QM-S9.[2]

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).

氮气中的一氧化碳 (CO) 是国际重点比较中最早使用的气体混合物之一。这种比较可以追溯到 1998 年 (CCQM-K1a) [1]。一氧化碳的另一个关键比较是 CCQM-K51，其含量较低，为 5 μmol/mol。从那时起，许多国家计量机构 (NMI) 已经为这些混合物开发了校准和测量能力 (CMC)。近期，APMP地区的NMI积极参与国际比对，提供国内服务。在 2017 年 APMP 会议上，几个 NMI 要求进行 CO 比较以建立 CO/N ₂支持工业需求的认证，由 KRISS 协调。因此，这种补充比较为 APMP 区域 NMI 提供了满足其工业需求的机会。它是 APMP.QM-S9 的复制品。 [2]

要访问本文的正文，请单击最终报告。请注意，此文本出现在 BIPM 密钥比较数据库 https://www.bipm.org/kcdb/ 的附录 B 中。

根据 CIPM 互认安排 (CIPM MRA) 的规定，最终报告已通过同行评审并由 CCQM 批准发布。