Experimental methods of evaluating measurement uncertainty resulting from sample collection and preparation for analysis in chemical laboratories / Niepewność pomiaru wynikająca z poboru i przygotowania próbek do badań w laboratorium chemicznym oszacowana metodą doświadczalną

A measurement result should be presented with its measurement uncertainty determined according to the evaluation method. The paper presents an experimental method used to evaluate measurement uncertainty resulting from the collection and preparation of samples for analysis in chemical labs. Evaluation of measurement uncertainty of the content of particular elements in actual samples has been conducted with the method of precision determination using ROBUST ANOVA analysis of variance. Analyses of soil samples were made in the Laboratory of the Institute of Environmental Protection - National Research Institute. The experimental method of evaluating measurement uncertainty allows a fast and relatively simple evaluation of all sources of uncertainty resulting from sample collection and preparation for analysis in chemical labs