Development of a SPME-GC-ECD methodology for selected pesticides in must and wine samples

A method for the determination of some pesticide residues in must and wine samples was developed using solid-phase microextraction (SPME) and gas chro matography - electron capture detection (GC/ECD). The procedure only needs dilution as sample pre-treatment and is therefore simple, fast and solvent- free. Eight fungicides (vinclozolin, procymidone, iprodione, penconazole, f enarimol, folpet, nuarimol and hexaconazole), one insecticide (chlorpyripho s) and two acaricides (bromopropylate and tetradifon) can be quantified. Go od linearity was observed for all the compounds in the range 5-100 mug/L. T he reproducibility of the measurements was found acceptable (with RSD's bel ow 20%). Detection limits of 11 mug/L, on average, are sufficiently below t he proposed maximum residue limits (MRL's) for these compounds in wine. The analytical method was applied to the determination of these compounds in P ortuguese must and wine samples from the Demarcated Region of Alentejo, whe re any residues could be detected.