title: Determination of 21 organochlorine pesticides in tree leaves using solid-phase extraction clean-up cartridges.
abstract: A method to determine 21 organochlorine pesticides (OCPs) in tree leaves [chestnut (Castanea sativa), hazel (Corylus avellana), oak (Quercus robur) and walnut tree (Juglans regia)] based on microwave-assisted extraction (MAE) followed by solid-phase extraction (SPE) clean-up is described. After extraction with hexane:acetone (50:50), four different sorbents (Florisil, tandem Florisil + alumina, silica and ENVI-Carb) were assayed for the clean-up step. Pesticides were eluted with 5 mL of hexane:ethyl acetate (80:20) and determined by gas chromatography and electron capture detection (GC-ECD). Carbon was the sorbent, which provided colourless eluates and chromatograms with less interferent compounds. Analytical recoveries obtained were ca. 100% for all the studied pesticides with this sorbent.
authors.affiliation: University Institute of Environment, Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira s/n, E-15071 A Coruña, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Barriada-Pereira
authors.forename: M J
authors.initials: MJ
authors.lastname: González-Castro
authors.forename: S
authors.initials: S
authors.lastname: Muniategui-Lorenzo
authors.forename: P
authors.initials: P
authors.lastname: López-Mahía
authors.forename: D
authors.initials: D
authors.lastname: Prada-Rodríguez
authors.forename: E
authors.initials: E
authors.lastname: Fernández-Fernández
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D018515:Plant Leaves / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013045:Species Specificity; D014197:Trees
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides