APPLICATION OF POROUS CARBON FOR SOLID-PHASE EXTRACTION OF DICARBOXYIMIDE FUNGICIDE RESIDUES FROM WINES IN COMBINATION WITH HIGH-RESOLUTIONCAPILLARY GAS-CHROMATOGRAPHY AND GAS-CHROMATOGRAPHY MASS-SPECTROMETRY

Solid-phase extraction with a novel porous carbon sorbent CARE GR was used for the clean-up step of dicarboxyimide fungicides residues from variety of Slovak grape wines with subsequent capillary gas chromatogr aphy-flame ionization detection, -electron-capture detection (ECD) and -mass spectrometry-ion-trap detection (MS-ITD) analysis. Recovery was tested at various concentration levels of vinclozolin and iprodione i n standard solutions (R=80-97%, R.S.D.less than or equal to 5). The va lue of recovery in spiked wines is dependent on concentration level (s tudied in the range of 5.9 mu g/l-1.96 mg/l) and on the variety of win e (R=80-96%; R.S.D.=3-5%). Limits of quantitation (for sample volume 5 0 ml) were determined to be with GC-ECD for both fungicides in ppt ran ge and with GC-MS-ITD in the multiple ion detection mode monitoring in ptt range for vinclozolin and ppb range for iprodione. Concentration levels of vinclozolin residues were determined in treated wines (with 0.1% Ronilan 50 WP) as well as iprodione residues (with 0.15% Rovral 5 0 WP) and a strong dependence on the protective term before the harves t is shown.