title: [Determination of 17 pyrethroid pesticide residues in vegetables by gas chromatography-mass spectrometry with negative chemical ionization].
abstract: A method was established for the determination of 17 pyrethroid pesticide residues in vegetables using QuEChERS (quick, easy, cheap, effective, rugged and safe) clean-up method and gas chromatography-mass spectrometry (GC-MS) with negative chemical ionization (NCI). The pyrethroid pesticides in the sample were extracted with acetonitrile. After QuEChERS clean-up with a mixture of primary secondary amine and graphitized carbon black packings, the extract was analyzed by GC-NCI-MS in selected ion monitoring (SIM) mode. An isotope internal standard of cypermethrin was employed to the quantification. The limits of quantification ranged from 0.02 to 5 microg/kg. The recoveries of the pyrethroid pesticides spiked in three different matrixes (peas, broccoli and Chinese onion green) at four spiked levels of 10, 20, 30 and 100 microg/kg were from 71.0% to 139.0%, and the relative standard deviations were less than 12.8%. This method can be used as a conclusive evidence method of the 17 pyrethroid pesticide residues in vegetables.
authors: Jiangsu Entry-Exit Inspection and Quarantine Bureau, Nanjing 210001, China. swj9722418@yahoo.com.cn
authors: Weijian
authors: W
authors: Shen
authors: Xiaowen
authors: X
authors: Cao
authors: Yijun
authors: Y
authors: Liu
authors: Rui
authors: R
authors: Zhang
authors: Xin
authors: X
authors: Fan
authors: Zengyun
authors: Z
authors: Zhao
authors: Chongyu
authors: C
authors: Shen
authors: Bin
authors: B
authors: Wu
mesh_terms: D005504:Food Analysis / Q000379:methods; D005506:Food Contamination / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D010573:Pesticide Residues / Q000032:analysis*; D011722:Pyrethrins / Q000032:analysis* / Q000737:chemistry; D014675:Vegetables / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues; D011722:Pyrethrins