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Ion Analysis at the Highest Stage - The Metrological Approach by National Metrological Institutes

Weber, Michael ; Felber, Helene

In: Microchimica Acta, 2004, vol. 146, no. 2, p. 91-95

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    Titel
    • Ion Analysis at the Highest Stage - The Metrological Approach by National Metrological Institutes
    Autor
    • Weber, Michael. Swiss Federal Laboratories for Materials Testing and Research (EMPA), 9014 St., Gallen, Switzerland
    • Felber, Helene. Swiss Federal Laboratories for Materials Testing and Research (EMPA), 9014 St., Gallen, Switzerland
    Dokumententyp
    • Postprint
    OAI-PMH-ID
    • oai:doc.rero.ch:319822
    Summary
    Abstract.: National Metrological Institutes (NMI's) from fifteen different countries participated in interlaboratory comparisons where concentrations of about 1 g kg−1 in solutions of aluminium, copper, iron, magnesium, chloride and phosphate were measured. A very high comparability of the results irrespective of the analyte and the applied measurement technique was observed. The relative in-between laboratory standard deviations of the results as reported by the participating laboratories were between 0.13% for copper and chloride up to 0.33% for aluminium, and all of the 81 results were found in the range of ±1% with respect to the reference value. Due to the gravimetric preparation of the samples, a conventional true reference value was calculated, and no significant deviations of the reference values and the means of all results reported by the institutes were found