The CCQM key comparison K73.2018 is a follow-up comparison of CCQM-K73. It was performed to demonstrate the capability of the participating institutes to measure the amount content of H⁺ in hydrochloric acid of 0.1 molkg⁻¹ molality. 16 NMIs participated in this comparison. The comparison was coordinated by PTB. The sample showed a slight but significant instability by loss of water of around 0.11 μmol kg⁻¹d⁻¹ corresponding to 0.02 % over the measurement period. Therefore, the results were corrected for this instability. The results of this key comparison show good equivalence between the majority of participants. The equivalence is significantly better compared to the first comparison CCQM-K73.

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 (CIPM MRA).

CCQM密钥比较K73.2018是CCQM-K73的后续比较。进行该实验以证明参与机构测量0.1 molkg ^-1摩尔浓度的盐酸中H ⁺含量的能力。16个NMI参与了此比较。比较是由PTB协调的。样品显示出轻微但显着的失稳，因为失水量约为0.11μmolkg ^-1 d ^-1，相当于整个测量期间的0.02％。因此，针对这种不稳定性校正了结果。这项关键比较的结果表明，大多数参与者之间具有很好的等效性。与第一个比较CCQM-K73相比，其等效性要好得多。

要获得本文的正文，请单击“最终报告”。请注意，此文本显示在BIPM密钥比较数据库kcdb.bipm.org/的附录B中。

根据CIPM相互认可安排（CIPM MRA）的规定，最终报告已由CCQM进行同行评审并批准发布。