title: Determination of simazine, terbuthylazine, and their dealkylated chlorotriazine metabolites in soil using sonication microextraction and gas chromatography.
abstract: A rapid analytical method is proposed for the determination of simazine, terbuthylazine, and their chloro dealkylated metabolites (simazine-desethyl, simazine-bisdesethyl, and terbuthylazine-desethyl) in soil. A sonication micromethod is presented for the extraction of -triazine herbicides and their metabolites. Final determination is by gas chromatography (GC) with nitrogen-phosphorus detection. The identity of all compounds was confirmed by GC with mass selective detection in the selected-ion monitoring mode. All chromatograms were very clean, without interfering peaks, and no cleanup was needed. The limits of detection were 1 pg for simazine-bisdesethyl; 5 pg for simazine, terbuthylazine, and terbuthylazine-desethyl; and 10 pg for simazine-desethyl. The limits of quantitation were 1, 5, and 10 ppb, respectively. Mean recoveries from fortified soils ranged from 76% for simazine-bisdesethyl to 102% for simazine-desethyl, with relative standard deviations of 3-6%.
authors.affiliation: Universidad de Murcia, Departamento de Química Agrícola, Geología y Edafología, Spain.
authors.forename: S
authors.initials: S
authors.lastname: Navarro
authors.forename: J
authors.initials: J
authors.lastname: Oliva
authors.forename: A
authors.initials: A
authors.lastname: Barba
authors.forename: C
authors.initials: C
authors.lastname: García
mesh_terms: D002849:Chromatography, Gas; D008401:Gas Chromatography-Mass Spectrometry; D006540:Herbicides / Q000032:analysis*; D007202:Indicators and Reagents; D012015:Reference Standards; D012839:Simazine / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D012996:Solutions; D014227:Triazines / Q000032:analysis*; D014461:Ultracentrifugation; D014465:Ultrasonics
chemical_list: D006540:Herbicides; D007202:Indicators and Reagents; D012989:Soil Pollutants; D012996:Solutions; D014227:Triazines; C037565:terbutylazine; D012839:Simazine