Autor(es):
Mouro, Filomena C. 
; Calisto, Sandra C. ; Trancoso, Maria Ascensão
Data: 2009
Identificador Persistente: http://hdl.handle.net/10400.9/582
Origem: Repositório do LNEG
Assunto(s): Uncertainty; Moisture; Dry matter; Mass fraction
Descrição
Moisture mass fraction, , and dry matter mass fraction, wOH2wDM,, are analytical parameters required by environmental European regulations. The metrological quality, namely measurement uncertainty, comply the fitness for purpose and enhances the comparability of analytical results. In this work, the component by component approach for measurement uncertainty estimation of and wOH2wDM is reported and the input quantities assessed. The measurement uncertainty of method’s precision, under within-laboratory reproducibility conditions, f(precision)Rw, was the only significant influence quantity when > 0,10 g gOH2w-1 for both ranges. In case of ≤ 0,10 g gOH2w-1, the mass of the capsule containing sample after the drying step, m(C+S)dry, has also a relevant contribution. Simplified models are proposed.
