ISSN:
1432-0517
Keywords:
Key words Measurement
;
Uncertainty
;
Analysis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract It is now becoming recognised in the measurement community that as well as reporting the measured value it is also essential to give its uncertainty. Without a knowledge of the uncertainty, it is impossible for the users of the result to know what confidence can be placed in it and it is also impossible to assess the comparability of different measurements of the same parameter. However, problems arise with the use of such terminology as error, accuracy, inaccuracy and uncertainty that has everyday connotations as well as formal definitions for use in metrology. The paper gives a resume of the reasons why it is important to evaluate and report the uncertainty on a result in a consistent manner. A description is given of the concept of uncertainty, which highlights the difference between it and error, accuracy or inaccuracy. This is followed by a discussion of the recommendations made by the "ISO – Guide to the Expression of Uncertainty in Measurement" for the evaluation and reporting of uncertainty. The methodology for evaluating uncertainty is described and the advantages of using suitable reference materials are discussed. Finally, the benefits to both the analytical laboratory and the user of the results from the evaluation and reporting of uncertainty are considered.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s007690050027
