title: Simultaneous Determination of Eight Pesticide Residues in Cowpeas by GC-ECD.
abstract: A sensitive and effective method, using gas chromatography (GC) and an electron capture detector (ECD), for the simultaneous quantitative determination of bifenthrin, chlorothalonil, cyfluthrin, cypermethrin, difenoconazole, fenvalerate, procymidone and pyridaben residues in cowpea was developed and validated. The method involved extracting with acetonitrile, purification with a graphitized carbon black/amino solid phase extraction cartridge, and then determining by GC-ECD. Recovery studies were carried out at three spiked levels (0.01, 0.1 and 0.5 mg/kg). The average recoveries at the three spiked levels ranged from 76.6 to 107.0% with relative standard deviations in the range of 1.2-5.6% for all analytes. The quantification limit was 0.01 mg/kg for each pesticide and was less than or equal to the relevant MRLs set by China, the Codex Alimentarius or the European Union. The developed analyzing method was convenient, time and cost saving, environment-friendly and readily available than the traditional methods.
authors.affiliation: College of Food Science and Technology of Huazhong Agricultural University, Wuhan 430070, China.|Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Analysis and Testing Center, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Analysis and Testing Center, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China huanzhibo@163.com.
authors.forename: Zhibo
authors.initials: Z
authors.lastname: Huan
authors.affiliation: Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Analysis and Testing Center, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
authors.forename: Jinhui
authors.initials: J
authors.lastname: Luo
authors.affiliation: Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Analysis and Testing Center, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
authors.forename: Defang
authors.initials: D
authors.lastname: Xie
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D057230:Limit of Detection; D016014:Linear Models; D010573:Pesticide Residues / Q000032:analysis*; D015203:Reproducibility of Results; D052616:Solid Phase Extraction; D000070658:Vigna / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues