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

Published

July 9, 2009

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

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

Pub Type

Journals

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Keywords

"Interlaboratory comparison", "purity analysis", "high purity metals", "CCQM-P107", "zinc"

Citation

Turk, G. , Kipphardt, H. , Matschat, R. , Vogl, J. , Gusarova, T. , Czerwensky, M. , Heinrich, H. , Hioki, A. , , L. , Methven, B. , Miura, T. , Petersen, O. , Riebe, G. , Sturgeon, R. and Yu, L. (2009), Purity determination as needed for the realisation of primary standards for elemental determination - status of international comparability, Metrologia, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=902555 (Accessed October 16, 2025)