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Abstract

Many reference materials undergo a batch certification, which implies that a small number of samples is taken from a batch, characterised, and these results are then assumed to be representative of all remaining samples. An important aspect in this design is the translation of the characterisation data to a single sample, as usually the laboratory will be using only one sample of the batch. This form of homogeneity is very important and can be influenced to a certain extent by well-designed sample preparation procedures. Another sub-sampling problem associated with many reference materials is that only a small test portion is drawn from the sample to carry out the measurement. Obviously, this test portion must be representative of the sample, otherwise the certified value is still not applicable. Both kinds of homogeneity tests are examined in the paper and evaluated using practical examples.

Additional information

Authors: LINSINGER T, JRC Institute for Reference Materials and Measurements, Geel (BE);PAUWELS J, JRC Institute for Reference Materials and Measurements, Geel (BE);VAN DER VEEN A, Nederlands Meetinstituut, Delft (NL)
Bibliographic Reference: An article published in: ACQUAL, the Journal of Accreditted Quality Assurance. Vol.6 (2001), pg. 26-30
Availability: An article published in: ACQUAL, the Journal of Accreditted Quality Assurance. Vol.6 (2001), pg. 26-30
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