RECOMMENDED METHODS OF ANALYSIS FOR PESTICIDE RESIDUES

Preference was given to gas chromatography or high performance liquid chromatography as the determinative step for the methods. Under certain conditions however, methods using less sophisticated procedures, such as thin-layer chromatography or spectrophotometry, may be applicable. This may be the case, for example, when an exporting country wants to check whether or not a commodity produced in that country complies with an Codex MRL. In this case, the treatment history of the commodity may be known or assumed, so that the method used need not be as elaborate as in cases where samples of unknown treatment history are under investigation. Also, when the MRL is high compared to the limit of determination, simpler methodology may be applied in order to arrive at a "pass/no pass" decision or for quick screening purposes.

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