Fate and distribution of pyrimethanil, metalaxyl, dichlofluanid and penconazol fungicides from treated grapes intended for winemaking

Luis Vaquero-Fernández (1) , Jesús Sanz Asensio (1) , Miguel López-Alonso (2) , María-Teresa Martínez-Soria (3)

1 Chemistry
2 Agriculture and Food
3 Chemistry

Tempranillo grapes were immersed in solutions of pyrimethanil, metalaxyl, dichlofluanid and penconazol fungicides in different concentrations during several times. The determination was carried out by GC-NPD, with an additional confirmatory method by GC-MS. The absorption percentage was determined as well as the distribution between surface, skin and pulp. The absorption percentages ranged from 7.2 to 85.5 %. These values depended on the time which grapes have been in contact with fungicide solutions. Residues were mainly found in skins. The percentages in skins ranged from 66.3 to 90.3 % of total residues. In pulp, these values were ranging from 3.5 to 31.0 %. The overall methodology was applied for the determination of pyrimethanil in Tempranillo grapes treated in the recommended doses, respecting the safety period. Pyrimethanil residues found in treated grapes were higher in skin.In grapes collected treated within the safety period (21 days), the levels found for fungicide residues were below Maximum Residues Levels.

Mots clés: Life Sciences

Luis Vaquero-Fernández, Jesús Sanz Asensio, Miguel López-Alonso, María-Teresa Martínez-Soria. Fate and distribution of pyrimethanil, metalaxyl, dichlofluanid and penconazol fungicides from treated grapes intended for winemaking. Food Additives and Contaminants, 2009, 26 (02), pp.164-171. ⟨10.1080/02652030802399026⟩. ⟨hal-00577317⟩