Test No. 508: Magnitude of the Pesticide Residues in Processed Commodities
This Test Guideline describes how to plan and carry out processing studies, i.e. determine
residue levels in primary processed commodities following pesticide application on
raw agriculture commodities (RAC) under conditions likely to lead to maximum residues.
It provides the distribution of residues (active ingredient, and/or metabolites, degradation
products), and preferential accumulation in various processed products resulting from
the processing of a commodity.
Used RACs (of plant origin and animal origin) should contain field-treated quantifiable
residues, at sufficient levels so that concentration/dilution factors for the various
consumed products and non-consumed intermediates can be determined. Pesticides residues
to be measured are determined by the residue definition based on studies on the nature
of the residue in processing and/or in plant and livestock. For each field test site
(at least two independent) the processing factor (Pf) is calculated as the ratio between
the residue level in the processed commodity and in the RAC or the commodity to be
processed. If a given commodity has two or more significantly different commercial
procedures, two trials for each procedure are necessary. Spiked samples should be
run concurrently with those from the processing study to ensure the method validity.
Published on October 16, 2008Also available in: French
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