Abstract
Certification of reference materials is far more than just characterisation of a selected homogeneous batch of material. From the perspective of the ISO Guide on the Expression of Uncertainty in Measurement (GUM) all uncertainty sources relevant to the user of an individual certified reference material (CRM) sample at a moment in time should be part of the CRM uncertainty. This not only includes the full uncertainty of the batch characterisation (rather than the statistical variation), but also all uncertainties related to possible between-bottle variation, instability upon long-term storage and instability during transport to the customer.
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Pauwels, J., van der Veen, A., Lamberty, A., Schimmel, H. (2000). Evaluation of uncertainty of reference materials. In: De Bièvre, P., Günzler, H. (eds) Measurement Uncertainty in Chemical Analysis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-05173-3_6
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DOI: https://doi.org/10.1007/978-3-662-05173-3_6
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