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Abstract
This paper concludes a study aimed at the development of a procedure for the determination of the content of heavy metals in compost. It deals with the different error sources in the total analytical procedure. Using analysis of variance, values for the components of variance for the determination of the heavy metal content of garbage compost have been assessed. It could be shown that these values have general validity, regardless of the compost lot examined and the nature of the element. Autocorrelation did not appear to be important when sampling compost. The values for components of variance assessed, served as the basis for designing total analytical procedures—comprising sampling, sample preparation and analysis—for the determination of the heavy metal content of garbage compost.