Title: International Comparison CCQM-P28: Ozone at Ambient Level
Authors: VIALLON JoëleMOUSSAY PhilippeESLER MichaelWIELGOSZ RobertBREMSER WolframNOVÁK JiříVOKOUN MiroslavBOTHA AngeliqueVAN RENSBURG Mellisa JanseZELLWEGER ChristophGOLDTHORP SandraBOROWIAK ANNETTELAGLER FRIEDRICHWALDEN JariMALGERI EttoreSASSI Maria PaolaMORILLO GOMEZ PilarFERNANDEZ PATIER RosaliaGALAN MADRUGA DavidWOO Jin-ChunDOO KIM YongMACÉ TatianaSUTOUR ChristopheSURGET AnaNIEDERHAUSER BernhardDANIEL SchwallerFRIGY BeataGYÖRGYNÉ VÁRALJAI IrénMUKAI HitoshiHIROSHI TanimotoAHLESON Hans PeterEGELØV AxelLADEGÅRD NilsMARSTEEN LeifTØRNKVIST KjerstiGUENTHER Franklin R.NORRIS James E.HAFKENSCHEID Theo L.VAN RIJN Martin M.QUINCEY PaulSWEENEY BryanLANGER SarkaMAGNUSSON BertilBASTIAN JulianaSTUMMER VolkerFRÖHLICH MarinaWOLF AndreasKONOPELKO Leonid A.KUSTIKOV Yuri A.RUMYANSTEV Dmitry V.
Citation: METROLOGIA vol. 43 no. 1A p. 08010
Publisher: BUREAU INT POIDS MESURES
Publication Year: 2006
JRC Publication N°: JRC34233
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC34233
Type: Articles in Journals
Abstract: 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.
JRC Institute:Institute for Environment and Sustainability

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