ISO uncertainty and collaborative trial data |
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Authors: | S L R Ellison |
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Institution: | (1) Laboratory of the Government Chemist, Queens Road, Teddington TW11 0LY, UK, GB |
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Abstract: | The possibility of using interlaboratory study repeatability and reproducibility estimates as the basis for measurement uncertainty
estimates is discussed. It is argued that collaborative trial reproducibility is an appropriate basis for estimating uncertainty
in routine testing provided certain conditions are met by the laboratory. The primary shortcomings relate to establishment
of traceability and consequent estimation of bias associated with the method, and quantitatively establishing the relevance
to the single laboratory. Approaches to resolving both difficulties are proposed, the former via full implementation of trueness
determination suggested in ISO 5725 : 1994 or by independent checks on individual accuracy and precision, the latter via a
reconciliation procedure. The paper also discusses other factors including sampling and sample pre-treatment, change in sample
matrix, and the influence of level of analyte.
Received: 28 October 1997 · Accepted: 17 November 1997 |
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Keywords: | Measurement uncertainty Collaborative study Bias Trueness |
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