title: Evaluation of comprehensive two-dimensional gas chromatography with micro-electron capture detection for the analysis of seven pesticides in sediment samples.
abstract: A GC-μECD and a GC×GC-μECD method were developed for the analysis of pesticides in sediments. For 1D-GC, instrumental LOD and LOQ were found in the range from 0.60 to 2.31μgL(-1) and 1.83 to 5.62μgL(-1), respectively. For GC×GC method development two sets of columns were tested (DB-5/DB-17ms, and HP-50+/DB-1ms), and the best results were obtained with the set of columns DB-5/DB-17ms. Instrumental LOD and LOQ were found in the range from 0.08 to 1.07μgL(-1) and 0.25 to 3.23μgL(-1), respectively. The LOD for the GC×GC was about 36% lower than those obtained for the 1D-GC. Concentrations of 21.18μgkg(-1) through 1D-GC method and 3.34μgkg(-1) for GC×GC for trifloxystrobin were found in a sediment sample which was collected close to an area of rice plantation.
authors.affiliation: Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, Porto Alegre, RS, Brazil.
authors.forename: Juliana Macedo
authors.initials: JM
authors.lastname: da Silva
authors.forename: Cláudia Alcaraz
authors.initials: CA
authors.lastname: Zini
authors.forename: Elina Bastos
authors.initials: EB
authors.lastname: Caramão
mesh_terms: D002849:Chromatography, Gas / Q000295:instrumentation* / Q000379:methods*; D004583:Electrons; D019015:Geologic Sediments / Q000737:chemistry*; D016014:Linear Models; D010575:Pesticides / Q000032:analysis*; D015203:Reproducibility of Results; D045483:Rivers; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical