Residues of pirimicarb and dichlofluanide in apple processing to juice andwine

The fate of the insecticide pirimicarb and the fungicide dichlofluanide app lied under field conditions was studied during apple processing to cloudy a nd clear juices and to cider. An untreated control was compared with raw ma terial from usual application of active substances upon needs and with a sa mple from overconcentrated spraying. The residues in the clear juices and c iders from all variants were below the determination limit of 5 mu g/kg. Pr essing and clarification by fining and filtration are important reduction s teps for residues. During apple processing, the highest residue levels were found in the pomace of the overconcentrated treated sample. For cloudy jui ces, no values are given. Because of an insufficient cleanup and matrix eff ects, the methods used here for residue analysis are not suitable for cloud y apple juices. Cloud particles from cloudy juices of the overconcentrated treated sample were isolated preparatively and subjected to residue analysi s. It could be demonstrated, that pirimicarb is able to enrich in the parti cles.