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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

BUCHMANN, José Henrique  and  SARKIS, Jorge Eduardo de Souza. The uncertainty concept as applied to the measurement process associated with the preparation of a calibration reference solution. Quím. Nova [online]. 2002, vol.25, n.1, pp.111-116. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422002000100019.

The implementation of a quality assurance program in chemical analytical laboratories, that can aid in demonstrate the quality of their results, is an issue of great concern. As a consequence, it is mandatory to give an estimate of the confidence that can be placed on the obtained results. An useful measure of this confidence is the measurement uncertainty and, nowadays, a result without the corresponding uncertainty statement cannot be considered reliable. This paper presents a summary of the most important mechanisms for the evaluation and reporting of the measurement uncertainty. In implementing these principles, it is described the measurement uncertainty estimation associated with the preparation of a uranium elemental reference solution at 2.4 mg.kg-1 from the corresponding certified reference material (in this example at 1003 mg.kg-1).

Keywords : uncertainty; quality assurance; chemical metrology.

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