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The Joint Research Centre (JRC) is the European Commission's science and knowledge service which employs scientists to carry out research in order to provide independent scientific advice and support to EU policy.
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The underlying principle is that one has to check whether the difference bet
For example: Certified reference material BCR-605 (road dust) with a trimethyllead-content of 7.9 ± 1.2 µg/kg has been used. The analytical result was 11.10 µg/kg and the standard measurement uncertainty as determined in the method validation (um) is 15 %, i.e. 1.67 µg/kg. The difference between analytical result and certified value is therefore 3.2 µg/kg. Prior to the determination of the combined uncertainty, the standard uncertainty of the certified value of the reference material must be determined. The uncertainty of the certified value (UCRM) is given as 95 % confidence interval with 6 degrees of freedom as stated on the certificate. The factor of the t-distribution (t95, 6) is 2.447. The confidence interval must be divided by this factor to obtain the standard uncertainty of the certified value. This standard uncertainty (uCRM) is therefore:
The combined uncertainty (uc) of measurement and certified value is the square root of the quadratic sum of the individual uncertainties:
The results show that the uncertainty of the certified value has almost no influence on the combined uncertainty. This combined uncertainty is now multiplied with a coverage factor of 2 to obtain the expanded uncertainty (here 3.48 µg/kg). This expanded uncertainty is bigger than the difference between analytical results and certified values (3.2 µg/kg). Within the limits of the uncertainties, no method bias is visible.
There are two CRM properties that describe the usefulness of a material for
Therefore, one should check whether the certified value of a CRM is traceable to the same reference as one’s method. If this is not the case, the material is unsuitable.
Example: Certified values for dietary fibre traceable to a certain ISO method are only valid, if exactly this method is used.
Additionally, one should check whether commutability is ensured. If this is not the case, the material may be unsuitable.
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CRMs should be used completely as soon as possible after receipt, because th
Under the Euratom Treaty, the European Commission, through the Directorate G
At international level, the European Commission also cooperates with the International Atomic Energy Agency (IAEA) on the control of nuclear materials and facilities in order to avoid proliferation or diversion. In this area, JRC-ITU analyses 100 environmental samples (particles on cotton swipes) per year, supporting both Euratom and IAEA requests.