Estimation of uncertainty to the homogeneity study in the certification of a candidate certified reference material in fish matrix

Abstract

Abstract.A homogeneity study in the preparation of a fish candidate certified reference material is reported. In the present study, homogeneity was examined by flow injection analysis cold vapour atomic absorption spectrometry technique (FIA-CV-AAS). Total mercury and methylmercury were studied in this study. Univariate analysis of variance (ANOVA) was performed for all analytes. The results were evaluated using an F-test, which demonstrated no significant difference for the between-bottle results. It is indicative that this material is homogeneous. The results of the between-bottle homogeneity study provide for the evaluation of one of the uncertainty components in the certification process.

Borax buffer solution for pH measurement: Homogeneity and stability studies and its application in the proficiency testing program

“…Therefore, the PT samples were found homogenous. F test indicated that the result of the homogeneity is insignificant if F < Fcrit, with the critical value of F for α =5 %, and e gives the level for which the observed F = Fcrit [19].…”