Joële Viallon et al 2006 Metrologia 43 08010 doi:10.1088/0026-1394/43/1A/08010
Joële Viallon1, Philippe Moussay1, Michael Esler, Robert Wielgosz1, Wolfram Bremser2, Jirí Novák3, Miroslav Vokoun3, Angelique Botha4, Mellisa Janse Van Rensburg4, Christoph Zellweger5, Sandra Goldthorp6, Annette Borowiak7, Friedrich Lagler7, Jari Walden8, Ettore Malgeri9, Maria Paola Sassi9, Pilar Morillo Gomez10, Rosalia Fernandez Patier10, David Galan Madruga10, Jin-Chun Woo11, Yong Doo Kim11, Tatiana Macé12, Christophe Sutour12, Ana Surget12, Bernhard Niederhauser13, Daniel Schwaller13, Beata Frigy14, Irén Györgyné Váraljai14, Shigeru Hashimoto15, Hitoshi Mukai15, Hiroshi Tanimoto15, Hans Peter Ahleson16, Axel Egeløv16, Nils Ladegard17, Leif Marsteen17, Kjersti Tørnkvist17, Franklin R Guenther18, James E Norris18, Theo L Hafkenscheid19, Martin M Van Rijn19, Paul Quincey20, Bryan Sweeney20, Sarka Langer21, Bertil Magnusson21, Juliana Bastian22, Volker Stummer22, Marina Fröhlich23, Andreas Wolf23, Leonid A Konopelko24, Yuri A Kustikov24 and Dmitry V Rumyanstev24
Show affiliationsWe report a pilot study organized within the Consultative Committee for Amount of Substance (CCQM), in which the ozone reference standards of 23 institutes have been compared to one common reference, the BIPM ozone reference standard, in a series of bilateral comparisons carried out between July 2003 and February 2005. The BIPM, which maintains as its reference standard a standard reference photometer (SRP) developed by the National Institute of Standards and Technology (NIST, United States), served as pilot laboratory. A total of 25 instruments were compared to the common reference standard, either directly (16 comparisons) or via a transfer standard (9 comparisons). The comparisons were made over the ozone mole fraction range 0 nmol/mol to 500 nmol/mol.
Two reference methods for measuring ozone mole fractions in synthetic air were compared, thanks to the participation of two institutes maintaining a gas-phase titration system with traceability of measurements to primary gas standards of NO and NO2, while the 23 other instruments were based on UV absorption.
In the first instance, each comparison was characterized by the two parameters of a linear equation, as well as their related uncertainties, computed with generalized least-squares regression software. Analysis of these results using the Birge ratio indicated an underestimation of the uncertainties associated with the measurement results of some of the ozone standards, particularly the NIST SRPs.
As a final result of the pilot study, the difference from the reference value (BIPM-SRP27 measurement result) and its related uncertainty were calculated for each ozone standard at the two nominal ozone mole fractions of 80 nmol/mol and 420 nmol/mol.
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The final report has been peer-reviewed and approved for publication by the CCQM.
Issue 1A ( 1 January 2006)
Joële Viallon et al 2006 Metrologia 43 08010
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