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High Precision Titrimetry, Ion Chromatography and ICP-Optical Emission Spectrometry for the Estimation of Inhomogeneities in Aqueous Calibration Solutions for Metrological Purposes

Weber, Michael ; Wüthrich, Jürg ; Rezzonico, Sergio

In: Microchimica Acta, 2004, vol. 146, no. 2, p. 165-171

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    Title
    • High Precision Titrimetry, Ion Chromatography and ICP-Optical Emission Spectrometry for the Estimation of Inhomogeneities in Aqueous Calibration Solutions for Metrological Purposes
    Author
    • Weber, Michael. Swiss Federal Laboratories for Materials Testing and Research (EMPA), CH-9014 St., Gallen, Switzerland
    • Wüthrich, Jürg. Swiss Federal Laboratories for Materials Testing and Research (EMPA), CH-9014 St., Gallen, Switzerland
    • Rezzonico, Sergio. Swiss Federal Laboratories for Materials Testing and Research (EMPA), CH-9014 St., Gallen, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:322324
    Summary
    Abstract.: The homogeneity of samples intended for metrological intercomparison studies must be granted without ambiguity. This holds equally true for aqueous solutions for which the determination of between-bottle variations requires measurement techniques with extremely high precision. Therefore measurement series were designed for automated analysis techniques such as titrimetry, optical emission spectrometry and ion chromatography which offer very high precision of results. Between-bottle relative standard deviations (RSD) of at best 0.008% were obtained with titrimetry. With optical emission spectrometry and ion chromatography, between-bottle RSD's of 0.02% and 0.05% were obtained. The contributions from these measurements were included in a conservative approach to the uncertainty budgets of the gravimetrical reference values for the analytes in the samples