Chapter

Measurement Uncertainty in Chemical Analysis

pp 29-33

Evaluation of uncertainty of reference materials

  • Jean PauwelsAffiliated withInstitute for Reference Materials and Measurements
  • , Adriaan van der VeenAffiliated withNederlands Meetinstituut
  • , Andrée LambertyAffiliated withInstitute for Reference Materials and Measurements
  • , Heinz SchimmelAffiliated withInstitute for Reference Materials and Measurements

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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.

Key words

Certified reference materials Uncertainty Characterisation Uncertainty analysis