title: [Determination of 21 organophosphorus pesticides in tea by gas chromatography-mass spectrometry coupled with hydroxylated multi-walled carbon nanotubes based on dispersive solid-phase extraction].
abstract: A rapid determination method of 21 organophosphorus pesticides in tea was developed by QuEChERS method using modified multi-walled carbon nanotubes (MWCNTs-OH), primary-secondary amine (PSA) and MgSO4 coupled with gas chromatography-mass spectrometry. The pesticide residues in tea were extracted with a hexane-acetone (2:1, v/v) mixture, and cleaned up by dispersive solid-phase extraction using MWCNTs-OH and primary-secondary amine (PSA) as the sorbents. After centrifugation and filtration, the target compounds were analyzed by gas chromatography-mass spectrometry and quantified by the external standard method. Under the optimized conditions, good linearities were obtained in the range of 0. 01- 0. 50 mg/kg. The average recoveries were in the range of 81. 5% -109. 4% at three spiked levels, with relative standard deviations (RSDs, n = 5 ) of 2. 3% - 10. 6%. The limits of quantification were 0. 001-0. 040 mg/kg. This method is simple, fast, sensitive, cheap, and can meet the requirements of the rapid detection of organophosphorus pesticides in tea.
authors.forename: Jiefeng
authors.initials: J
authors.lastname: Rong
authors.forename: Hang
authors.initials: H
authors.lastname: Wei
authors.forename: Yijun
authors.initials: Y
authors.lastname: Li
authors.forename: Huoshui
authors.initials: H
authors.lastname: Huang
authors.forename: Meizhu
authors.initials: M
authors.lastname: Xu
mesh_terms: D005504:Food Analysis; D008401:Gas Chromatography-Mass Spectrometry; D037742:Nanotubes, Carbon; D009943:Organophosphorus Compounds / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D052616:Solid Phase Extraction; D013662:Tea / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D009943:Organophosphorus Compounds; D010575:Pesticides; D013662:Tea