Establishing comparability and compatibility in the purity assessment of high purity zinc as demonstrated by the CCQM-P149 intercomparison.

Vogl, Jochen; Kipphardt, Heinrich; Richter, Silke; Bremser, Wolfram; del Rocio Arvizu, Maria; Velina Lara, Judith; Buzoianu, Mirella; Hill, Sarah; Petrov, Panayot; Goenaga-Infante, Heidi; Sargent, Mike; Fisicaro, Paola; Labarraque, Guillaume; Zhou, Tao; Turk, Gregory; Winchester, Michael; Miura, Tsutoma; Methven, Brad; Sturgeon, Ralph E.; Jährling, Reinhard; Rienitz, Olaf; Mariassy, Michal; Hankova, Zuzana; Sobina, Egor; Krylov, Anatoly Ivanovich; Kustikov, Yuri Anatolievich; Smirnov, Vadim Vladimirovich

doi:https://doi.org/10.1088/1681-7575/aaa677

Zugriffsnummer	39885
Dokumenttyp	Zeitschriftenartikel
Sprache	Englisch
Titel	Establishing comparability and compatibility in the purity assessment of high purity zinc as demonstrated by the CCQM-P149 intercomparison.
Autor(in); Institution	Vogl, Jochen; Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, GERMANY Kipphardt, Heinrich; Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, GERMANY Richter, Silke; Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, GERMANY Bremser, Wolfram; Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, GERMANY del Rocio Arvizu, Maria; Centro Nacional de Metrologia, Queretaro, Queretaro, MEXICO Velina Lara, Judith; Centro Nacional de Metrologia, Queretaro, Queretaro, MEXICO Buzoianu, Mirella; National Institute of Metrology (INM), Bucharest, ROMANIA Hill, Sarah; LGC Limited (LGC),Teddington, UK Petrov, Panayot; LGC Limited (LGC),Teddington, UK Goenaga-Infante, Heidi; LGC Limited (LGC),Teddington, UK Sargent, Mike; LGC Limited (LGC),Teddington, UK Fisicaro, Paola; Laboratoire National de Metrologie et d'Essais, Paris, FRANCE Labarraque, Guillaume; Laboratoire National de Metrologie et d'Essais, Paris, FRANCE Zhou, Tao; National Institute of Metrology, Beijing, CHINA Turk, Gregory; National Institute of Standards and Technology, Gaithersburg Md.,USA Winchester, Michael; National Institute of Standards and Technology, Gaithersburg Md., USA Miura, Tsutoma; Sangyo Gijutsu Sogo Kenkyujo Keiryo Hyojun Sogo Center, Tsukuba, JAPAN Methven, Brad; National Research Council Canada, Ottawa, CANADA Sturgeon, Ralph E.; Measurement Science and Standards, National Research Council of Canada, Ottawa, CANADA Jährling, Reinhard; 3.1, Metrologie in der Chemie, PTB-Braunschweig Rienitz, Olaf; 3.1, Metrologie in der Chemie, PTB-Braunschweig Mariassy, Michal; Slovak Institute of Metrology, Bratislava, SLOVAKIA Hankova, Zuzana; Slovak Institute of Metrology, Bratislava, SLOVAKIA Sobina, Egor; Ural Scientific Research Institute for Metrology, Ekaterinburg, RUSSIA Krylov, Anatoly Ivanovich; DI Mendeleyev Institute for Metrology (VNIIM), Sankt Petersburg, RUSSIA Kustikov, Yuri Anatolievich; DI Mendeleyev Institute for Metrology (VNIIM), Sankt Petersburg, RUSSIA Smirnov, Vadim Vladimirovich; DI Mendeleyev Institute for Metrology (VNIIM), Sankt Petersburg, RUSSIA
Quelle/Jahr	Metrologia: 55 (2018), 2
ISSN	0026-1394 (PRINT) ; 1681-7575 (ONLINE)
DOI	https://doi.org/10.1088/1681-7575/aaa677
Verlag	Bristol [u.a.]: Inst. of Physics Publ
Zusammenfassung	For the first time, an international comparison was conducted on the determination of the purity of a high purity element. Participants were free to choose any analytical approach appropriate for their institute's applications and services. The material tested was a high purity zinc, which had earlier been assessed for homogeneity and previously used in CCQM-K72 for the determination of six defined metallic impurities. Either a direct metal assay of the Zn mass fraction was undertaken by EDTA titrimetry, or an indirect approach was used wherein all impurities, or at least the major ones, were determined and their sum subtracted from ideal purity of 100%, or 1 kg kg⁻¹. Impurity assessment techniques included glow discharge mass spectrometry, inductively coupled plasma mass spectrometry and carrier gas hot extraction/combustion analysis. Up to 91 elemental impurities covering metals, non-metals and semi-metals/metalloids were quantified. Due to the lack of internal experience or experimental capabilities, some participants contracted external laboratories for specific analytical tasks, mainly for the analysis of non-metals. The reported purity, expressed as zinc mass fraction in the high purity zinc material, showed excellent agreement for all participants, with a relative standard deviation of 0.011%. The calculated reference value, w(Zn) = 0.999 873 kg kg⁻¹, was assigned an asymmetric combined uncertainty of +0.000 025 kg kg⁻¹ and −0.000 028 kg kg⁻¹. Comparability amongst participating metrology institutes is thus demonstrated for the purity determination of high purity metals which have no particular difficulties with their decomposition/dissolution process when solution-based analytical methods are used, or which do not have specific difficulties when direct analysis approaches are used. Nevertheless, further development is required in terms of uncertainty assessment, quantification of non-metals and the determination of purity of less pure elements and/or for those elements suffering difficulties with the decomposition process.

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Vogl, J., Kipphardt, H., Richter, S., Bremser, W., del Rocio Arvizu, M., Velina Lara, J., Buzoianu, M., Hill, S., Petrov, P., Goenaga-Infante, H., Sargent, M., Fisicaro, P., Labarraque, G., Zhou, T., Turk, G., Winchester, M., Miura, T., Methven, B., Sturgeon, R. E., Jährling, R., Rienitz, O., Mariassy, M., Hankova, Z., Sobina, E., Krylov, A. I., Kustikov, Y. A., & Smirnov, V. V. (2018). Establishing comparability and compatibility in the purity assessment of high purity zinc as demonstrated by the CCQM-P149 intercomparison. Metrologia, 55(2). https://doi.org/10.1088/1681-7575/aaa677

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