title: Comparative study of clean-up and fractionation methods for the determination of organochlorine pesticides in lipids by gas chromatography.
abstract: Three of the methods most often used for the clean-up and fractionation of organochlorine pesticides in lipid residue analysis by gas chromatography with electron-capture detection were compared. The overall recoveries of twenty pesticides from spiked samples were higher than 88%, the relative standard deviation being in the range 3-11% (n = 6) at the 36-80 ppb (10(9) level. The three methods were compared by analysis of variance, with no differences in precision at the 0.05 significance level. Differences in recoveries appeared in only two instances. None of the three methods seems to be significantly better than the others for the determination of the pesticides studied.
authors.affiliation: Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Spain.
authors.forename: J E
authors.initials: JE
authors.lastname: Quintanilla-López
authors.forename: R
authors.initials: R
authors.lastname: Lebrón-Aguilar
authors.forename: L M
authors.initials: LM
authors.lastname: Polo-Díez
mesh_terms: D002849:Chromatography, Gas; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides / Q000032:analysis*; D008055:Lipids / Q000737:chemistry*
chemical_list: D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D008055:Lipids