Browsing by Autor "José Luis Ortiz-Aparicio"

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CCQM-K170 - electrolytic conductivity at 0.5 S m<sup>-1</sup> and 20 S m<sup>-1</sup> - final report
(IOP Publishing, 2025) Hai Wang; Meiling Wang; Xiaoping Song; Steffen Seitz; Michal Máriássy; Dániel T. Nagy; Juan C. Godinez; José Luis Ortiz-Aparicio; Martina Vičarová; Jaypee Quiño
Main text The comparison CCQM-K170 is a subsequent key comparison of CCQM-K36.2016 and CCQM-K92. It aims to demonstrate the capabilities of the participating NMIs/DIs to measure the electrolytic conductivity of aqueous electrolyte solution in the electrolytic conductivity range around 0.5 S m -1 and 20 S m -1 . The coordinating institute (NIM) prepared two potassium chloride solutions with the nominal electrolytic conductivity of 0.5 S m -1 and 20 S m -1 , and verified their homogeneity and stability. Seventeen and twelve NMIs/DIs, respectively, reported their measurement results of 0.5 S m -1 and 20 S m -1 samples, respectively. The institutes used primary and secondary methods, and commercial instruments. Institutes using non-NMI CRMs as calibrants or CRMs from a participating NMI were excluded from KCRV calculation. The measurement results traceable to CRMs from the same non-participating NMI were combined into one result to be used for KCRV calculation. The results of institutes which have indicated technical problems were also excluded from KCRV calculation. The medians were agreed upon as the KCRVs for 0.5 S m -1 and 20 S m -1 solutions based on CCQM/2013-22 guidance document. Good agreement of the results was observed for the majority of participants. The results of this key comparison are considered representative for electrolytic conductivity measurement of aqueous electrolyte solution in the electrolytic conductivity range 0.15 S m -1 to 1.5 S m -1 and 5 S m -1 to 25 S m -1 , respectively. This KC is intended as an updated support for the corresponding calibration and measurement capabilities (CMCs) entries in the key comparison data base of the BIPM. 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 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).
CCQM-K91.2022 key comparison on pH of an unknown phthalate buffer
(IOP Publishing, 2024) Fabiano Barbieri Gonzaga; Leonardo da Silva Pardellas; Dániel Nagy; Zsófia Nagyné Szilágyi; Lyudmila Dimitrova; Ayu Hindayani; Jazmin Montero-Ruiz; José Luis Ortiz-Aparicio; Matilda Roziková; Jimena Torrez
Main text Key comparison CCQM-K91.2022, a repetition of the previous comparison CCQM-K91 from 2011, was performed to evaluate the degree of equivalence between pH measurement results of an unknown phthalate buffer reported by participating National Metrology Institutes (NMIs) and Designated Institutes (DIs). The participants used the highest-level metrological method existing at their institution. The nominal pH value of the buffer was 4.0 at 25 °C and the suggested measurement temperatures were 5 °C, 15 °C, 25 °C, 37 °C, and 50 °C. There was a good agreement among the results from most participants at 15 °C, 25 °C, and 37 °C. Due to the lack of results, no evaluation was possible of results at 5 °C and 50 °C. 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 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).
Subsequent key comparison of the pH of a borate buffer
(IOP Publishing, 2025) Joanna Dumańska; Monika Pawlina; Zuzana Hanková; Michal Máriássy; D. L. Nagy; Z Nagyné Szilágyi; Iliya Georgiev; Boryana Koleva; José Luis Ortiz-Aparicio; J Montero Ruiz
Main text The regional key comparison registered under the EURAMET No. 1619 and the KCDB ID EURAMET.QM-K19.2018 was a subsequent comparison of CCQM-K19.2018. It was organized mainly for European institutes that either could not participate in the CCQM-K19.2018 or could not provide results due to the ramifications of the corona pandemics in 2021. The comparison was performed to demonstrate the capability of the participating institutes to measure pH of borate buffer (pH ~ 9.2) at 15 °C, 25 °C and 37 °C, optionally at 5 °C and 50 °C. The institutes could use a method of their choice, but the use of a method of the highest available level was expected. The results of PTB and NMIJ were used as a link to the KCRV of the original CCQM-K19.2018. Good agreement of the results was demonstrated by most of the participants. 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 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).