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Final report on subsequent key comparison CCQM-K18.1: pH of carbonate buffer

L Vyskocil1, M Máriássy1, Marcela Monroy2, Adrian Reyes2, Pia Tønnes Jakobsen3, Paulo P Borges4, Isabel C S Fraga4, Júlio C Dias4, Bianca S R Marques4, Elena Kardash5, Rachel Champion6, Paola Fisicaro6, Hongyu Xiu7, Janine Giera8, Petra Spitzer8 and Anna Mathiasová1

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KEY COMPARISON

The subsequent key comparison CCQM-K18.1 was started in order to evaluate the equivalence of metrology institutes as a follow-up to the previous key comparison CCQM-K18 for institutes that could not take part in the comparison at that time or did not consider their results representative of their capabilities. A carbonate buffer of a slightly different composition to that in CCQM-K18 was used.

There were seven institutes plus the coordinating laboratory participating in this subsequent comparison. Most of the participating institutes showed significant improvement; in some cases the new results confirmed the previous ones. The reasons for this have still to be elucidated.

Main text. 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 (MRA).


Dates

Issue 1A ( 1 January 2008)



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