Comparison of pesticide residues in composite samples and in individual units: the Swedish approach to sampling

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Abstract
The method used to take samples for residues testing in Sweden involves taking three subsamples of 1–2kg. These are split in two for laboratory analyses. Where required one of these laboratory samples can be used to determine the variability between individual units. Details of the variation in residues in individual units of a number of commodities are presented. The highest variability factors, around 600, expressed as the quotient of the maximum and the minimum residue, were found for methamidophos in peppers and monocrotophos in grapes.

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