The IRMM—International Measurement Evaluation Program (IMEP) |
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Authors: | Lamberty A Lapitajs G Van Nevel L Götz A Moody J R Erdmann D E De Bievre P |
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Institution: | 1.Institute for Reference Materials and Measurements (IRMM), B-2440, Geel, Belgium ;2.University of Saarbrücken, FRG ;3.IRMM/University of Antwerpen, Belgium ;4.Visiting Scientist,
IRMM, Belgium ;5.NIST, 20899, Gaithersburg, MD ;6.US Geological Survey, Denver, CO ; |
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Abstract: | The aim of the IRMM—International Measurement Evaluation Program (IMEP) is to test out a possible realization of international measurement comparability for field laboratories through traceability of their measurements to the SI Unit for amount of substance: the mole. In IMEP-3, 10 different trace elements, B, Ca, Cd, Cu, Fe, K, Li, Pb, Rb, and Zn, were determined in a synthetic and a natural water by participating laboratories using their routine methods and graphically compared (in coded form) to certified values, established by IRMM and NIST using an isotope-specific method (Isotope Dilution Mass Spectrometry, Neutron Activation Analysis). The number of participants was 70; 64 laboratories have reported results. The results show a spread of more than 50% asymmetrically around the certified value. The Youden graphs allow evaluation of the overall performance of the laboratories in the IMEP-3 round. |
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