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Publication Citation: Purity determination as needed for the realisation of primary standards for elemental determination - status of international comparability

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Author(s): Gregory C. Turk; Heinrich Kipphardt; Ralf Matschat; Jochen Vogl; Tamara Gusarova; Michael Czerwensky; Hans-Joachim Heinrich; Akiharu Hioki; Leonid A. Konopelko; Brad Methven; Tsutomu Miura; Ole Petersen; Gundel Riebe; Ralph Sturgeon; Lee L. Yu;
Title: Purity determination as needed for the realisation of primary standards for elemental determination - status of international comparability
Published: July 09, 2009
Abstract: Within the National Metrology Institutes (NMIs) and designated laboratories, an interlaboratory comparison, CCQM-P107, was conducted to verify the degree of international comparability concerning the results of purity analysis. The mass fractions of Ag, Bi, Cd, Cr, Ni, Tl at the lower mg/kg-level in a high purity zinc material were determined, but the real measurand in metrological sense was the sum of the six mass fractions. Homogeneity was investigated by Glow Discharge Mass Spectrometry, reference values were obtained using Isotope Dilution Mass Spectrometry. Six NMIs participated, contributing eight independent data sets. The agreement amongst the results of the participants, their median and the agreement with the reference values were usually excellent and in almost all cases below the target uncertainty of 30 % relative. In this manner the accuracy of results and the comparability between the participants was demonstrated to be established.
Citation: Metrologia
Pages: pp. 29 - 37
Keywords: "Interlaboratory comparison"; "purity analysis"; "high purity metals"; "CCQM-P107"; "zinc"
Research Areas: Inorganic Analytical Chemistry, Chemistry
PDF version: PDF Document Click here to retrieve PDF version of paper (374KB)