CIPM MRA COMPARISON REPORTS

KEY COMPARISON

CCQM-K173.2

Assay of sodium carbonate

M. Máriássy , Z. Hanková , P.P. Borges , S. Pereira Sobral , D. Nagy , Z. Nagyné Szilágyi , T. Orwa , S. Kachila

Citation M. Máriássy et al 2026 CIPM MRA Comparison reports 08002

https://doi.org/10.59161/CJNO5613

Authors

Michal Máriássy Slovak Institute of Metrology (SMU) Slovakia

Zuzana Hanková Slovak Institute of Metrology (SMU) Slovakia

Paulo Paschoal Borges Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO) Brazil

Sidney Pereira Sobral Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO) Brazil

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

Zsófia Nagyné Szilágyi Government Office of the Capital City Budapest (BFKH) Hungary

Tabitha Orwa Kenya Bureau of Standards (KEBS) Kenya

Sheila Kachila Kenya Bureau of Standards (KEBS) Kenya

Abstract

The CCQM key comparison CCQM-K173.2 is a subsequent comparison to CCQM-K173. It was based on a request of INMETRO for a bilateral comparison; KEBS and BFKH joined also to demonstrate their capability to measure the amount content of bases. The institutes could use a method of their choice, although the use of coulometry or titrimetry with potentiometric determination of the endpoint was expected. The result of SMU was used as a link to the original comparison CCQM-K173.

The results of KEBS and BFKH were in good agreement with the reference value; a probable reason for the slight deviation of INMETRO’s result was suggested.

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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