Literature DB >> 11451233

Estimating the uncertainty of stability for matrix CRMs.

T P Linsinger1, J Pauwels, A Lamberty, H G Schimmel, A M van der Veen, L Siekmann.   

Abstract

The new version of ISO Guide 34 requires producers of certified reference materials (CRMs) to include contributions of possible instability to the overall CRM uncertainty, to obtain a value for the uncertainty in compliance with the Guide to the Expression of the Uncertainty in Measurement (GUM). A pragmatic approach to estimating the uncertainty of stability is presented. It relies on regression analysis of stability data with subsequent testing of the slope of the regression line for significance. If the slope is found to be statistically insignificant, a shelf life is chosen and the uncertainty connected with this time is estimated via the standard deviation of the slope. This uncertainty is included in the overall uncertainty of the CRM. This approach is explained with examples showing its applicability to matrix CRMs.

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Year:  2001        PMID： 11451233     DOI： 10.1007/s002160100719

Source DB:  PubMed          Journal:  Fresenius J Anal Chem        ISSN： 0937-0633


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