title: [Determination of chlorpyrifos and its metabolite in vegetables using gas chromatography-tandem mass spectrometry].
abstract: A method was developed for the determination of chlorpyrifos and its metabolite--3,5,6-trichloro-2-pyridinol (TCP) in vegetables using gas chromatography-tandem mass spectrometry (GC-MS/MS). The sample was extracted with acetone. After the concentration, TCP was derivatized with N-(tert-butyldimethylsilyl) -N-methyltrifluoroacetamide (MTBSTFA). The purification was performed using a florisil solid-phase extraction cartridge. The analyte was detected by triple quadrupole MS in multi-reaction monitoring mode. An internal standard method was used for the quantification of chlorpyrifos, the limit of quantification was 1 microg/kg, and the recoveries were in the range of 75.57% - 106.41% with the relative standard deviations (RSDs) of 8.33% - 17.58%. An external standard method was used for the quantification of TCP, the limit of quantification was 0.5 microg/kg, and the recoveries were in the range of 69.11% - 108.43% with the RSDs of 5.20% - 19.42%. The good linear relationships were obtained in the range of 2 - 100 microg/L for the both target analytes. The method can be applied for the determination of chlorpyrifos and its metabolite in vegetables.
authors.affiliation: Chinese Academy of Inspection and Quarantine, Beijing 100123, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Ling
authors.forename: Han
authors.initials: H
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Yong
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Chu
mesh_terms: D004390:Chlorpyrifos / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D053719:Tandem Mass Spectrometry; D014675:Vegetables / Q000737:chemistry*
chemical_list: D004390:Chlorpyrifos