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Dissipation kinetics of fluquinconazole and pyrimethanil residues in apples intended for baby food production

Szpyrka, Ewa, Walorczyk, Stanisław
Food chemistry 2013 v.141 no.4 pp. 3525-3530
apples, children, food production, foods, fungicide residues, fungicides, gas chromatography, infants, maximum residue limits, pathogens
Dissipation behaviour of simultaneously applied fungicides fluquinconazole and pyrimethanil was studied in/on apples intended for baby food production (cultivars Jonagold Decosta, Golden and Champion). The apples were sprayed at two dosages to control the pathogen Venturia inaedequalis (Cooke) Aderh. A validated gas chromatographic method (GC-ECD and GC-NPD) was used to determine the fungicides residues, the analytical performance of which was highly satisfactory with expanded uncertainties not higher than 15% (coverage factor k=2, confidence level 95%) The dissipation of the fungicide residues was fitted to the experimental data assuming pseudo first-order decay kinetics (R2 between 0.897 and 0.992). To obtain the fungicide residues below 0.01mg/kg, which is the default maximum residue level for food intended for infants and young children, the application of the fungicides under study should be carried out 2 or 3months before harvest at the lower (1.0L/ha) and the higher (1.5L/ha) recommended dose, respectively.