title: [Determination of ten pesticides of pyrazoles and pyrroles in tea by accelerated solvent extraction coupled with gas chromatography-tandem mass spectrometry].
abstract: An effective method was developed and applied to determine the residues of ten pesticides of pyrazoles and pyrroles in tea by accelerated solvent extraction coupled with gas chromatography-tandem mass spectrometry (ASE-GC-MS/MS). The samples were extracted with ethyl acetate-hexane (1:1, v/v) for 5 min at 1.03 x 10(7) Pa and 100 degree C for one cycle. Then, they were purified by Envi-Carb/PSA column, and eluted by ethyl acetate-hexane (1:1, v/v). The analytes were determined by GC-MS/MS and quantified by external standard method. The limits of quantification were 0.003 mg/kg for fenpyroximate, 0.001 mg/kg for fipronil-sulfide, 0.002 mg/kg for fipronil, 0.005 mg/kg for fipronil-sulfone, 0.002 mg/kg for chlorfenapyr, 0.006 mg/kg for flusilazole, 0.001 mg/kg for difenzoquat, 0.001 mg/kg for pyraflufen-ethyl, 0.000 3 mg/kg for tebufenpyrad and 0.005 mg/kg for tolfenpyrad. The results show that the proposed method is sensitive and accurate for the determination of the ten pesticide residues.
authors.affiliation: Xiamen Entry-Exit Inspection and Quarantine Bureau, Xiamen 361026, China.
authors.forename: Dunming
authors.initials: D
authors.lastname: Xu
authors.forename: Shengyu
authors.initials: S
authors.lastname: Lu
authors.forename: Dajie
authors.initials: D
authors.lastname: Chen
authors.forename: Jinchang
authors.initials: J
authors.lastname: Lan
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Zhang
authors.forename: Fang
authors.initials: F
authors.lastname: Yang
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D005506:Food Contamination / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D059627:Liquid Phase Microextraction / Q000379:methods; D010573:Pesticide Residues / Q000032:analysis*; D011720:Pyrazoles / Q000032:analysis*; D011758:Pyrroles / Q000032:analysis*; D012997:Solvents / Q000737:chemistry; D053719:Tandem Mass Spectrometry / Q000379:methods; D013662:Tea / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues; D011720:Pyrazoles; D011758:Pyrroles; D012997:Solvents; D013662:Tea