title: Multiresidue determination of pesticides in apples and pears by gas chromatography-mass spectrometry.
abstract: This paper describes a rapid, specific and sensitive multiresidue method for the routine analysis of several classes of pesticides used for the treatment of apples and pears, involving a rapid extraction procedure at pH 4.5 with a mixture of acetone-dichloromethane-hexane (50:20:30, v/v/v) and gas chromatography coupled to mass-selective detection, in order to achieve quantitative analysis down to their respective maximum residue limit. Extraction recoveries were between 55 and 98%. Limits of detection and limits of quantitation ranged respectively, from 0.01 to 0.05 mg/kg and from 0.02 to 0.1 mg/kg. Intra-assay relative standard deviation was less than 19% for all compounds. An excellent linearity was observed from these LOQs up to 500 mg/kg. Intermediate (inter-assay) precision and accuracy were satisfactory. The method has been applied to many fruit samples intended for commercialisation.
authors.affiliation: Department of Pharmacology and Toxicology, University Hospital, Limoges, France.
authors.forename: E
authors.initials: E
authors.lastname: Lacassie
authors.forename: M F
authors.initials: MF
authors.lastname: Dreyfuss
authors.forename: J L
authors.initials: JL
authors.lastname: Daguet
authors.forename: M
authors.initials: M
authors.lastname: Vignaud
authors.forename: P
authors.initials: P
authors.lastname: Marquet
authors.forename: G
authors.initials: G
authors.lastname: Lachâtre
mesh_terms: D005638:Fruit / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D010573:Pesticide Residues / Q000032:analysis*; D019685:Rosales / Q000737:chemistry*
chemical_list: D007202:Indicators and Reagents; D010573:Pesticide Residues