title: [Determination of organophosphorus pesticide multi-residues in tea by gas chromatography].
abstract: An efficient gas chromatographic method for the determination of 14 organophosphorus pesticide residues in tea by gas chromatography using micro-chemical and solid phase extraction technique has been established. The organophosphorus pesticides were extracted from tea samples with ethyl acetate and mixture of ethyl acetate-hexane(1:1, V/V). The extracts were cleaned up with a column of 3 mL Supelclean Envl-carb by GILSON ASPEC XL. The 14 organophosphorus pesticides were separated from each other through SPB-1701 capillary column(30 m x 0.53 mm i.d. x 1.0 micron) and determined by flame photometric detector. The recoveries ranged 70.8%-120% when the added levels were from 0.100 mg/kg to 1.00 mg/kg, the RSD was 2%-7% and the limits of detection were 0.01 mg/kg-0.08 mg/kg. This method is rapid, sensitive and suitable for the analysis of pesticide residues. It can also be applied to the determination of organophosphorus pesticide multi-residues in other plant samples such as vegetables, fruits and so on.
authors.affiliation: Hunan Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China, Changsha 410007, China. 1zy@163.net
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Huang
authors.forename: Y J
authors.initials: YJ
authors.lastname: Li
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D007306:Insecticides / Q000032:analysis; D009943:Organophosphorus Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012680:Sensitivity and Specificity; D012997:Solvents; D013662:Tea / Q000737:chemistry*
chemical_list: D007306:Insecticides; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D012997:Solvents; D013662:Tea