Validation of the uncertainty evaluation for the determination of metals in solid samples by atomic spectrometry |
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Authors: | R J N Bettencourt da Silva M Filomena G F C Camões João Seabra e Barros |
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Institution: | CECUL, Faculdade de Ciências da Universidade de Lisboa, P-1700 Lisbon, Portugal, PT Instituto Nacional de Engenharia e Tecnologia Industrial, Estrada do Pa?o do Lumiar, P-1699 Lisbon Codex, Portugal, PT
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Abstract: | Every analytical result should be expressed with some indication of its quality. The uncertainty as defined by Eurachem ("parameter
associated with the result of a measurement that characterises the dispersion of the values that could reasonably be attributed
to the, . . ., quantity subjected to measurement") is a good tool to accomplish this goal in quantitative analysis. Eurachem
has produced a guide to the estimation of the uncertainty attached to an analytical result. Indeed, the estimation of the
total uncertainty by using uncertainty propagation laws is components-dependent. The estimation of some of those components
is based on subjective criteria. The identification of the uncertainty sources and of their importance, for the same method,
can vary from analyst to analyst. It is important to develop tools which will support each choice and approximation. In this
work, the comparison of an estimated uncertainty with an experimentally assessed one, through a variance test, is performed.
This approach is applied to the determination by atomic absorption of manganese in digested samples of lettuce leaves. The
total uncertainty estimation is calculated assuming 100% digestion efficiency with negligible uncertainty. This assumption
was tested.
Received: 3 November 1997 · Accepted: 2 January 1998 |
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Keywords: | Uncertainty Validation Quality control Solid samples Atomic spectrometry |
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