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The combined uncertainty in the analytical results of solid materials for two methods (ET-AAS analysis after prior sample digestion and direct solid sampling) are derived by applying the ISO-guide. For the analysis of solid materials generally three uncertainty components must be considered: those in the calibration, in the unknown sample measurement, and in the AQC-process, the latter including the uncertainty in the certified content of the used CRM. The confidence limits for the content of cadmium and lead for analytical data from biological samples are calculated. For both methods the confidence intervals are generally of similar width, if all sources of uncertainty are included, although the respective uncertainty terms contribute to different degrees. The estimation of uncertainty contributions is shown to be a suitable tool for the experimental design in order to obtain a small uncertainty in the analytical result.

Additional information

Authors: KURFURST U, University of Fulda, Department of Nutrition (DE);REHNERT A, University of Fulda, Department of Nutrition (DE);MUNTAU H, JRC Ispra (IT)
Bibliographic Reference: Article: Chemosphere (1995)
Record Number: 199511212 / Last updated on: 1995-10-10
Original language: en
Available languages: en