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- CCQM-P107 (1)
- COOMET.QM-S5 (1)
- Gas analysis (1)
- High purity metals (1)
- Interlaboratory comparison (1)
- Purity analysis (1)
- Zinc (1)
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.
The relevance of the COOMET.QM-S5 comparison is founded on tightening of requirements to a control of automobile emissions (realization of environmental standards of EURO 4, EURO-5). Participating laboratories: VNIIM, BAM, BelGIM, Ukrmetrteststandart, KazInMetr. This comparison was carried out in 2013-2014. This supplementary comparison supports CMC claims for: CO2 in the range (4–16) 10⁻² mol/mol; CO in the range (0.5–5) 10⁻² mol/mol; C3H8 in the range (0.01–0.3) 10⁻² mol/mol. Results:
Component CO:
All laboratories identified the values of carbon monoxide mole fraction in the gas mixture within ±0.9134%.
Component CO2:
All laboratories identified the values of carbon dioxide mole fraction in the gas mixture within ±0.3042%.
Component C3H8:
All laboratories identified the values of propane mole fraction in the gas mixture within ±0.443%.