CIPM MRA COMPARISON REPORTS

The CCQM key comparison CCQM-K99.1 is a subsequent comparison to CCQM-K99. It aims to demonstrate the capability of Korean Research Institute of Standards and Science (KRISS) to measure the pH of phosphate buffer solutions. The result of Physikalisch-Technische Bundesanstalt (PTB) was used as a link to the original comparison CCQM-K99.

In this comparison, a measurement method is restricted to the use of the primary method of pH (Harned cell method). Measurements of pH were performed at 15 °C, 25 °C, and 37 °C. The results from KRISS were in good agreement with the reference value, providing evidence to support the respective CMC claims.

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).