Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-25927 Zeitschriftenartikel Flores, E.; Idrees, F.; Moussay, P.; Viallon, J.; Wielgosz, R.; Fernández, T.; Ramírez, S.; Rojo, A.; Shinji, U.; Waldén, J.; Sega, M.; Sang-Hyub, O.; Macé, T.; Couret, C.; Qiao, H.; Smeulders, D.; Guenther, F.R.; Thorn, W.J. III; Tshilongo, J.; Ntsasa, N.G.; Stovcík, V.; Valková, M.; Konopelko, L.; Gromova, E.; Nieuwenkamp, G.; Wessel, R. M.; Milton, M.; Harling, A.; Vargha, G.; Tuma, Dirk; Kohl, Anka; Schulz, Gert Final report on international comparison CCQM-K74: Nitrogen dioxide, 10 µmol/mol There is a high international priority attached to activities which reduce NOx in the atmosphere. The current level of permitted emissions is typically between 50 µmol/mol and 100 µmol/mol, but lower values are expected in the future. Currently, ambient air quality monitoring regulations also require the measurement of NOx mole fractions as low as 0.2 µmol/mol. The production of accurate standards at these levels of mole fractions requires either dilution of a stable higher concentration gas standard or production by a dynamic technique, for example one based on permeation tubes. The CCQM-K74 key comparison was designed to evaluate the level of comparability of National Metrology Institutes' measurement capabilities and standards for nitrogen dioxide (NO2) at a nominal mole fraction of 10 µmol/mol. The measurements of this key comparison took place from June 2009 to May 2010. Seventeen laboratories took part in this comparison coordinated by the BIPM and VSL. The key comparison reference value was based on BIPM measurement results, and the standard measurement uncertainty of the reference value was 0.042 µmol/mol. This key comparison demonstrated that the results of the majority of the participants agreed within limits of ±3% relative to the reference value. The results of only one laboratory lay significantly outside these limits. Likewise this comparison made clear that a full interpretation of the results of the comparison needed to take into account the presence of nitric acid (in the range 100 nmol/mol to 350 nmol/mol) in the cylinders circulated as part of the comparison, as well as the possible presence of nitric acid in the primary standards used by participating laboratories. 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). DatesIssue 1A (Technical Supplement 2012) Bristol Inst. of Physics Publ. 2012 Metrologia 49 08005 1 117 10.1088/0026-1394/49/1A/08005 2016-02-19 OPUS4-25928 Zeitschriftenartikel Flores, E.; Idrees, F.; Moussay, P.; Viallon, J.; Wielgosz, R.; Fernández, T.; Rojo, A.; Ramírez, S.; Aoki, N.; Kato, K.; Jeongsoon, L.; Moon, D.; Kim, J.-S.; Harling, A.; Milton, M.; Smeulders, D.; Guenther, F.R.; Gameson, L.; Botha, A.; Tshilongo, J.; Ntsasa, N.G.; Valková, M.; Konopelko, L.; Kustikov, Y.A.; Ballandovich, V. S.; Gromova, E.V.; Tuma, Dirk; Kohl, Anka; Schulz, Gert Final report of the pilot study CCQM-P110-B1: A comparison of nitrogen dioxide (NO2) in nitrogen standards at 10 µmol/mol by Fourier transform infrared spectroscopy (FT-IR) This pilot study compares the performance of participants in analyzing gas mixtures of nitrogen dioxide in nitrogen by comparison with in-house gravimetric standards using Fourier transformed infrared spectroscopy (FT-IR). In this study the same gas mixtures were used as in the key comparison CCQM-K74, which was designed to evaluate the level of comparability of National Metrology Institutes' measurement capabilities for nitrogen dioxide (NO2) at a nominal mole fraction of 10 µmol/mol. In the comparison CCQM-K74 most of the participants used chemiluminescence, with a small number using UV absorption or FT-IR spectroscopy, and thus it is of interest to improve understanding of the comparative performance of these techniques because they do not exhibit any cross-sensitivity to nitric acid (HNO3), which was known to be present in the mixtures used for the comparison. The results of this pilot study indicate good consistency and a level of agreement similar to that reported in the comparison CCQM-K74, demonstrating that FT-IR can be operated as a comparison method when calibrated with appropriate gas standards and can achieve similar measurement uncertainties to chemiluminescence and UV absorption techniques. An additional pilot study, CCQM-P110-B2, was conducted on the same gas mixtures in parallel with this pilot study. The second study addressed FT-IR spectroscopy when used to measure the gas mixtures with respect to reference spectra. The results of this second study will be reported elsewhere. Main text. To reach the main text of this paper, click on Final Report. The final report has been peer-reviewed and approved for publication by the CCQM-GAWG. DatesIssue 1A (Technical Supplement 2012) Bristol Inst. of Physics Publ. 2012 Metrologia 49 08006 1 76 10.1088/0026-1394/49/1A/08006 2016-02-19 OPUS4-25931 Zeitschriftenartikel Nieuwenkamp, G.; Wessel, R. M.; van der Veen, A.M.H.; Ziel, P. R.; Han, Q.; Tuma, Dirk; Woo, J.-C.; Fuko, J.T.; Szilágyi, N.; Büki, T.; Konopelko, L.; Kustikov, Y.A.; Popova, T.A.; Pankratov, V.V.; Pir, M.N.; Nazarov, E.V.; Ehvalov, L.V.; Timofeev, A.U.; Kuzmina, T.A.; Meshkov, A.V.; Valková, M.; Pätoprsty, V.; Downey, M.; Vargha, G.; Brown, A.; Milton, M. International comparison CCQM-K77: Refinery gas Refinery gas is a complex mixture of hydrocarbons and non-combustible gases (e.g., carbon monoxide, carbon dioxide, nitrogen, helium). It is obtained as part of the refining and conversion of crude oil. This key comparison aims to evaluate the measurement capabilities for these types of mixtures. The results of the key comparison indicate that the analysis of a refinery-type gas mixture is for some laboratories a challenge. Overall, four laboratories (VSL, NIM, NPL and VNIIM) have satisfactory results. The results of some participants highlight some non-trivial issues, such as appropriate separation between saturated and unsaturated hydrocarbons, and issues with the measurement of nitrogen, hydrogen and helium. 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). DatesIssue 1A (Technical Supplement 2012) Bristol Inst. of Physics Publ. 2012 Metrologia 49 08003 1 71 10.1088/0026-1394/49/1A/08003 2016-02-19 OPUS4-40013 Zeitschriftenartikel Zhou, Z.; Han, Q.; Wang, D.; Macé, T.; Kipphardt, Heinrich; Maiwald, Michael; Tuma, Dirk; Uehara, S.; Akima, D.; Shimosaka, T.; Jung, J.; Oh, S.-H.; van der Veen, A.; van Wijk, J.I.T.; Ziel, P. R.; Konopelko, L.; Valkova, M.; Mogale, D.M.; Botha, A.; Brewer, P.; Murugan, A.; Minnaro, M.D.; Miller, M.; Guenther, F.; Kelly, M.E. CCQM K101 Final report international comparison CCQM-K101:Oxygen in nitrogen-a track B comparison and that the matrix contains argon This key comparison aims to assess the capabilities of the participants to determine the amount-of-substance fraction oxygen in nitrogen. The GAWG has classified this as a track B comparison, due to the unexpected 50 μmol/mol argon mole fraction content of the transfer standards, which effects the achievable performance of some measurement techniques such a GC-TCD. The separation of oxygen and argon is challenging, and not all systems in use are equally well designed for it. As this analytical challenge due to a substantial fraction of argon in the transfer standards became a reality, the Gas Analysis Working Group (GAWG) decided to qualify this key comparison as a regular key comparison and not as a core comparison, which may be used to support calibration and measurement capabilities (CMCs) for oxygen in nitrogen, or for oxygen in nitrogen mixtures containing argon only (see also the section on support to CMCs). IOP publishing BIPM 2016 Metrologia 53 Techn Suppl 08013, 1 71 2017-04-28