Application of porous carbon for solid-phase extraction of dicarboxyimide fungicide residues from wines in combination with high-resolution capillary gas chromatography and gas chromatography-mass spectrometry.
Solid-phase extraction with a novel porous carbon sorbent CARB GR was used for the clean-up step of dicarboxyimide fungicides residues from variety of Slovak grape wines with subsequent capillary gas chromatography-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 in standard solutions (R = 80-97%, R.S.D. < or = 5). The value of recovery in spiked wines is dependent on concentration level (studied in the range of 5.9 micrograms/1-1.96 mg/l) and on the variety of wine (R = 80-96%; R.S.D. = 3-5%). Limits of quantitation (for sample volume 50 ml) were determined to be with GC-ECD for both fungicides in ppt range 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 50 WP) and a strong dependence on the protective term before the harvest is shown.
Matisová
E
E
Department of Analytical Chemistry, Faculty of Chemical Technology, Slovak Technical University, Bratislava, Slovak Republic.
Kakalíková
L
L
Lesko
J
J
de Zeeuw
J
J
D000620:Aminoimidazole Carboxamide / Q000031:analogs & derivatives / Q000032:analysis / Q000302:isolation & purification; D002244:Carbon / Q000737:chemistry*; D002849:Chromatography, Gas / Q000379:methods*; D005659:Fungicides, Industrial / Q000032:analysis* / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry; D006827:Hydantoins; D009994:Osmolar Concentration; D010080:Oxazoles / Q000032:analysis / Q000302:isolation & purification; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification; D015203:Reproducibility of Results; D014920:Wine / Q000032:analysis* / Q000145:classification
D005659:Fungicides, Industrial; D006827:Hydantoins; D010080:Oxazoles; D010573:Pesticide Residues; D000620:Aminoimidazole Carboxamide; D002244:Carbon; C025643:vinclozolin; C033148:iprodione