title: [Multiresidue determination of organophosphorus pesticide residues in vegetables and fruit by gas chromatography-negative ion chemical ionization-mass spectrometry].
abstract: An analytical method of gas chromatography coupled with negative ion chemical ionization-mass spectrometry for simultaneous determination of nine organophosphorus pesticide residues in vegetables and fruit has been developed, and the negative ions structure and partition mechanism of the nine organophosphorus pesticides were interpreted. Meanwhile, the matrix effect for sample analysis was discussed, and matrix-matched calibration for quantification was introduced to reduce the matrix effect in this method. Pesticides were extracted from sample with ethyl acetate in an ultrasonic bath, then determined by gas chromatography-mass spectrometry operated in negative chemical ionization mode and quantified in selective ion monitoring mode, and ethion was used as an internal standard. The detection limits of the method were 0.12-1.0 microg/kg for the nine organophosphorus pesticides, and the relative coefficients were higher than 0.9993. A blank sample (tomato) was spiked at 100, 400, 800 microg/kg for each pesticide, and the recoveries were determined to be from 78% to 126% with relative standard deviations from 0.58% to 14.7% for the pesticides.
authors.affiliation: Key Laboratory of Analytical Sciences of Ministry of Education, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, China. linzg@xmu.edu.cn
authors.forename: Zhuguang
authors.initials: Z
authors.lastname: Lin
authors.forename: Yulan
authors.initials: Y
authors.lastname: Fan
authors.forename: Yu
authors.initials: Y
authors.lastname: Ma
authors.forename: Zhen
authors.initials: Z
authors.lastname: Jin
authors.forename: Jun
authors.initials: J
authors.lastname: Tan
authors.forename: Meiyu
authors.initials: M
authors.lastname: Chen
authors.forename: Zhaobin
authors.initials: Z
authors.lastname: Chen
authors.forename: Fengzhang
authors.initials: F
authors.lastname: Tu
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000383:Agriculture; D002138:Calibration; D002849:Chromatography, Gas / Q000379:methods*; D005506:Food Contamination; D005638:Fruit / Q000737:chemistry*; D057230:Limit of Detection; D010573:Pesticide Residues / Q000032:analysis*; D011786:Quality Control; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry; D014675:Vegetables / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues