Masaaki Maruyama et al 2007 Metrologia 44 08007 doi:10.1088/0026-1394/44/1A/08007
Masaaki Maruyama1, Jiri Novak2, Jari Walden3, Kaisa Lusa3, Florbela Dias4, Annette Borowiak5, Friedrich Lagler5, Jln Seog Kim6, Tatiana Mace7, Christophe Sutuur7, Franklin Guenther8, Adriaan van der Veen9, Gerard Nieuwenkamp9, Janneke van Wijk9, Martin Milton10, Graham Leggett10, Anneliese Medem11, Volker Stummer11, Leonid Konopelko12, Yuri Kustikov12, Olga Efremova12 and Marina Froehlich13
Show affiliationsAccurate measurements of sulphur dioxide at the concentrations found in ambient air have become essential to support monitoring and legislation concerned with air quality. In general, the primary element of quality assurance for field instruments is regular calibration using certified gas mixtures. The concentration range chosen for this Key Comparison (240 nmol/mol to 320 nmol/mol) is defined by appropriate European standards and is typical of similar levels used around the world.
The travelling standards used for the comparison were prepared commercially by a supplier with a proven track record of preparing stable mixtures of the relevant gases. The coordinating laboratory (NPL) carried out stability checks on the mixtures and determined the amount fraction using a primary gravimetric permeation facility. These data were used to determine the drift rate (and uncertainty) of each standard.
The results for the 11 participants in CCQM-K26.b and the one participant in CCQM-P50.b are presented in this report. Degrees of equivalence have been calculated based on a reference value (corresponding to the KCRV) derived from the primary gravimetric facility used by the coordinating laboratory.
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).
Issue 1A ( 1 January 2007)
Masaaki Maruyama et al 2007 Metrologia 44 08007
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