International Comparison CCQM-P28: Ozone at Ambient Level

We 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.

VIALLON Joële;  MOUSSAY Philippe;  ESLER Michael;  WIELGOSZ Robert;  BREMSER Wolfram;  NOVÁK JiřÍ;  VOKOUN Miroslav;  BOTHA Angelique;  VAN RENSBURG Mellisa Janse;  ZELLWEGER Christoph;  GOLDTHORP Sandra;  BOROWIAK Annette;  LAGLER Friedrich;  WALDEN Jari;  MALGERI Ettore;  SASSI Maria Paola;  MORILLO GOMEZ Pilar;  FERNANDEZ PATIER Rosalia;  GALAN MADRUGA David;  WOO Jin-Chun;  DOO KIM Yong;  MACÉ Tatiana;  SUTOUR Christophe;  SURGET Ana;  NIEDERHAUSER Bernhard;  DANIEL Schwaller;  FRIGY Beata;  GYÖRGYNÉ VÁRALJAI Irén;  MUKAI Hitoshi;  HIROSHI Tanimoto;  AHLESON Hans Peter;  EGELØV Axel;  LADEGÅRD Nils;  MARSTEEN Leif;  TØRNKVIST Kjersti;  GUENTHER Franklin R.;  NORRIS James E.;  HAFKENSCHEID Theo L.;  VAN RIJN Martin M.;  QUINCEY Paul;  SWEENEY Bryan;  LANGER Sarka;  MAGNUSSON Bertil;  BASTIAN Juliana;  STUMMER Volker;  FRÖHLICH Marina;  WOLF Andreas;  KONOPELKO Leonid A.;  KUSTIKOV Yuri A.;  RUMYANSTEV Dmitry V.; 

2006-11-07

BUREAU INT POIDS MESURES

JRC34233

https://publications.jrc.ec.europa.eu/repository/handle/JRC34233,