Sampling and analysis of Measurement uncertainty
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The 2002 version of the ILAC document, ILAC G17 (Introducing the Concept of Uncertainty of Measurement in Testing in Association with the Application of the Standard ISO/IEC 17025) is still under revision. Accreditation bodies should acknowledge that even ILAC states that there is currently not enough guidance and a lack of rules for implementing Uncertainty in sampling, i.e. reporting separately as sMU (see https://www.eurachem.org/images/stories/workshops/2019_11_MU/pdf/P1-09_ILAC_UfS_guidance_Oehlenschlaeger.pdf).
I would say that until the ILAC decision is communicated after the March 2020 Beijing meeting, there is justification to merely interpret and comply with the ISO 17025:2017 requirements for measurement uncertainty evaluation (as discussed in the ILAC presentation). Besides the latest Eurachem guideline Measurement uncertainty arising from sampling, 2nd edition (2019), available at https://www.eurachem.org/index.php/publications/guides/musamp; the primary normative ISO standards are the ISO 98 series, including
- ISO/IEC GUIDE 98-1:2009 [JCGM/WG1/104] Uncertainty of measurement - Part 1: Introduction to the expression of uncertainty in measurement;
- ISO/IEC Guide 98-3:2008(en) Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GUM:1995);
- ISO/IEC Guide 98-4:2012 Uncertainty Of Measurement - Part 4: Role Of Measurement Uncertainty In Conformity Assessment
Then for Microbiology, there is the recently revised ISO 19036:2019 Microbiology of the food chain - Estimation of measurement uncertainty for quantitative determinations. Trust this is of some assistance.
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Jan 13, 2020