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Final report on CCQM-K19.1: pH of borate buffer

2011; IOP Publishing; Volume: 48; Issue: 1A Linguagem: Inglês

10.1088/0026-1394/48/1a/08010

1681-7575

Petra Spitzer, Beatrice Adel, J. R. Meyer, Jessica Matzke, Fabiano Barbieri Gonzaga, Paulo Paschoal Borges, Júlio Cesar Dias, Xiu Hongyu, Bing Wu, Pia Tønnes Jakobsen, Rachel Champion, Masaki Ohata, I. I. Maksimov, Akiharu Hioki, L Vyskočil, Michal Máriássy, Kenneth W. Pratt,

Analytical Methods in Pharmaceuticals

The subsequent key comparison CCQM-K19.1 was carried out in 2010 as a follow-up comparison to CCQM-K19. Three laboratories (NMIJ, PTB and SMU) took part in both comparisons. Their results are consistent. The assigned uncertainties are reliable and of the same order. These results provide the link to CCQM-K19. As well as the original comparison the subsequent key comparison was organized to demonstrate the capability of the interested national metrology institutes to measure the pH value of an unknown borate buffer by a primary method at 15 °C, 25 °C and 37 °C. Eight laboratories took part in CCQM-K19.1. The participants either were not able to participate in the original comparison or participate only in the Pilot Study CCQM-P82 running in parallel to CCQM-K19. In one case the laboratory expressed doubts on the integrity of the sample provided in CCQM-K19. The result in CCQM-K19.1 is the acidity function at zero chloride molality of the unknown borate buffer solution. Most participants in the key comparison CCQM-K19.1 demonstrated improved capabilities. This especially applies to the laboratories that had originally taken part in the pilot study CCQM-P82. In some cases previous results could be confirmed. The hidden reasons for that have still to be clarified. 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).