Homogeneity testing of reference materials |
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Authors: | J Pauwels Andrée Lamberty Heinz Schimmel |
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Institution: | (1) European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), B-2440 Geel, Belgium Tel.: +32-14-571722 Fax: +32-14-590406, BE |
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Abstract: | Homogeneity testing is of the highest importance for the certification of reference materials, as it should demonstrate the
validity of the certified values and their uncertainties in the analysis of individual units or portions thereof. However,
the conclusions drawn from the results of these studies may often be questioned. It is proposed to improve this situation
by quantifying the effect of homogeneity studies in terms of their impact on the uncertainty of certified values. Here it
should be noted that the between-units variability directly affects the certified uncertainty, whereas the within-unit inhomogeneity
only defines the minimum representative test portion.
Received: 18 September 1997 · Accepted: 21 November 1997 |
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Keywords: | Reference material Homogeneity testing Within-unit heterogeneity Between-units heterogeneity |
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