Abstract
Simple in principle, the evaluation of uncertainty, especially in chemical analysis, is not a routine task and needs great care to be correct. This can be seen, particularly, from an examination of the EURACHEM Guide, Quantifying Uncertainty in Analytical Measurement (1995), which is the most important document on the subject. The examination reveals, in the author’s opinion, a shortage of correctness in some principal details of the uncertainty estimation process as presented in worked examples in the Guide, and the author has therefore formulated some “in pursuit of correctness” rules for estimating uncertainty. The rules and respective comments are concerned with the following items: (1) choosing an appropriate distribution function in type B evaluation of uncertainty, (2) the necessity for consideration of separate contributions to the combined uncertainty, and (3) taking account of actual influence factors in the uncertainty estimation process. Furthermore, the problem of estimation of conditional versus overall uncertainty is touched upon in connection with comparative trials where only internal consistency of results is required.
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References
Analytical Methods Committee, RSC (1995) Analyst 120: 2303 - 2308
Cortez L (1995) Microchim Acta 119: 323 - 328
Williams A (1996) Accred Qual Assur 1: 14 - 17
Wegscheider W, Zeiler FI-J, Heindl R, Mosser J (1997) Annal Chim 87: 273 - 283
EURACHEM (1995) Quantifying Uncertainty in Analytical Measurement
ISO, IEC, OIML, BIPM (1992) Guide to the Expression of Uncertainty in Measurement, 1st edn. ISO (The 1993 edition in the name of the seven organizations including IFCC, IUPAC, IUPAP is also available )
ISO 384 (1979) Laboratory glassware. Principles of design and construction of volumetric glassware
ISO 4787 (1984) Laboratory glassware. Volumetric glassware. Methods for use and testing of capacity
Doerffel K (1990) Statistik in der analytischen Chemie, 5th edn, chap 8. Deutscher Verlag für Grundstoffindustrie, Leipzig
Weise K, Wöger W (1994) Meas Sci Technol 5: 879 - 882
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© 1998 Springer-Verlag Berlin Heidelberg
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Kadis, R.L. (1998). Evaluating uncertainty in analytical measurements: the pursuit of correctness. In: De Bièvre, P., Günzler, H. (eds) Measurement Uncertainty in Chemical Analysis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-05173-3_27
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DOI: https://doi.org/10.1007/978-3-662-05173-3_27
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-07884-2
Online ISBN: 978-3-662-05173-3
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