CIPM MRA COMPARISON REPORTS

KEY COMPARISON

CCQM-K73.2018.4

Amount content of H+ in an HCl solution

F. Bastkowski , P.P. Borges , D. Nagy

Citation F. Bastkowski et al 2026 CIPM MRA Comparison reports 08010

https://doi.org/10.59161/FRDD3126

Authors

F. Bastkowski Physikalisch-Technische Bundesanstalt (PTB) Germany

P. P. Borges Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO) Brazil

Dániel Nagy Government Office of the Capital City Budapest (BFKH) Hungary

Abstract

The CCQM key comparison K73.2018.4 is a follow-up comparison of CCQM K73.2018. It was performed to demonstrate the capability of the participating institutes to measure the amount content of H⁺ in hydrochloric acid of 0.1 mol·kg^-1 molality. Three NMIs participated in this comparison with PTB being the linking lab. The comparison was coordinated by PTB.

The sample showed a slight but significant instability by loss of water of around 0.13μmol kg^-1d^-1 corresponding to 0.006 % over the measurement period. The results were
corrected for this instability.

The results of this subsequent key comparison showed significant deviations from the KCRV.

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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