DESENVOLVIMENTO DE METODOS ANALITICOS PARA DETERMINACAO DE AGROTOXICOS EM SEDIMENTOS POR CROMATOGRAFIA GASOSA MONODIMENSIONAL E BIDIMENSIONAL ABRANGENTE COM MICRO DETECTOR DE CAPTURA DE ELETRONS

摘要

The development of analytical methods for determination of eight pesticides of different chemical classes (trichlorfon, propanil, fipronil, propiconazole, trifloxystrobin, permethrin, difenoconazole and azoxystrobin) in sediments with gas chromatographymicro-electron capture detector (GC/μECD) and comprehensive two-dimensional gas chromatography with micro-electron capture detector (GCxGC/μLECD) is described. These methods were applied to real sediment samples, and the best results were obtained using a 5% diphenyl-methylpolysiloxane column for ID-GC. For GCxGC the same column was employed in the first dimension and a 50%-phenyl-methylpolysiloxane stationary phase was placed in the second dimension. Due to the superior peak capacity and selectivity of GCxGC, interfering matrix peaks were separated from analytes, showing a better performance of GCxGC.