Evaluating uncertainty in analytical measurements: the pursuit of correctness |
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Authors: | R Kadis |
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Institution: | (1) D. I. Mendeleyev Institute for Metrology (VNIIM), 19 Moskovsky pr., 198005 St. Petersburg, Russia Fax: +7-812 327-97-76 e-mail: hal@onti.vniim.spb.su, RU |
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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.
Received: 29 January 1998 · Accepted: 10 February 1998 |
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Keywords: | Chemical analysis Measurement uncertainty Estimation process |
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