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A model to set measurement quality objectives and to establish measurement uncertainty expectations in analytical chemistry laboratories using ASTM proficiency test data |
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| Authors: | Dean A. Flinchbaugh L. F. Crawford David Bradley |
| Affiliation: | (1) Flinchbaugh Consulting Bethlehem, Pa., USA e-mail: DAFlinch@bellatlantic.net, Tel.: +1–610–694 6473,, US;(2) Bethlehem Steel Corporation Bethlehem, Pa., USA e-mail: Larry.Crawford@Bethsteel.com, Tel.: +1–610–694 6646, Fax: +1–610–694 1739, US;(3) ASTM Headquarters West Conshohocken, Pa., USA e-mail: Dbradley@ASTM.org, Tel.: +1–610–832 9681, US |
| Abstract: | A model is presented that correlates historical proficiency test data as the log of interlaboratory standard deviations versus the log of analyte concentrations, independent of analyte (measurand) or matrix. Analytical chemistry laboratories can use this model to set their internal measurement quality objectives and to apply the uncertainty budget process to assign the maximum allowable variation in each major step in their bias-free measurement systems. Laboratories that are compliant with this model are able to pass future proficiency tests and demonstrate competence to laboratory clients and ISO 17025 accreditation bodies. Electronic supplementary material to this paper can be obtained by using the Springer LINK server located at http://dx.doi.org/ 10.1007/s007690100398-y. Received: 31 March 2001 Accepted: 11 September 2001 |
| Keywords: | Proficiency test Uncertainty Measurement quality objectives Accreditation ISO 17025 |
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