title: Multi-residue determination of 171 pesticides in cowpea using modified QuEChERS method with multi-walled carbon nanotubes as reversed-dispersive solid-phase extraction materials.
abstract: A rapid and sensitive method for the determination of 171 pesticides in cowpea was developed using multi-walled carbon nanotubes (MWCNTs) as reversed-dispersive solid-phase (r-DSPE) extraction materials. The clean-up performance of MWCNTs was proved to be obviously superior to PSA and GCB. This method was validated on cowpea spiked at 0.01 and 0.1mgkg(-1) with five replicates. The mean recoveries for 169 pesticides ranged from 74% to 129% with relative standard deviations (RSDs) (n=5) lower than 16.4%, except diflufenican and quizalofop-ethyl. Good linearity for all pesticides was obtained with the calibration curve coefficients (R(2)) larger than 0.9970. The limit of detection (LODs) and limit of quantification (LOQs) for the 171 pesticides ranged from 0.001 to 0.003mgkg(-1) and from 0.002 to 0.009mgkg(-1), respectively. The method was demonstrated to be reliable and sensitive for the routine monitoring of the 171 pesticides in cowpea samples.
authors.affiliation: Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, PR China.
authors.forename: Yongtao
authors.initials: Y
authors.lastname: Han
authors.affiliation: Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, PR China.
authors.forename: Le
authors.initials: L
authors.lastname: Song
authors.affiliation: Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, PR China.
authors.forename: Nan
authors.initials: N
authors.lastname: Zou
authors.affiliation: Institute of Pesticide and Environmental Toxicology, Guangxi University, Nanning 530005, PR China.
authors.forename: Ronghua
authors.initials: R
authors.lastname: Chen
authors.affiliation: Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, PR China.
authors.forename: Yuhong
authors.initials: Y
authors.lastname: Qin
authors.affiliation: Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, PR China; Institute of Pesticide and Environmental Toxicology, Guangxi University, Nanning 530005, PR China. Electronic address: canpingp@cau.edu.cn.
authors.forename: Canping
authors.initials: C
authors.lastname: Pan
mesh_terms: D057230:Limit of Detection; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis*; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*; D000070658:Vigna / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D010573:Pesticide Residues
keywords: Cowpea; MWCNTs; Pesticide residues; r-DSPE