title: Use of graphitic carbon black and primary secondary amine for determination of 17 organophosphorus pesticide residues in spinach.
abstract: Graphitized carbon black (GCB) and primary secondary amine (PSA) as dispersive-SPE sorbents were applied to optimize the method for the determination of 17 organophosphorus pesticides in spinach which contained so many pigments using GC with flame photometric detector (FPD). The sample was extracted with ACN, and an aliquot of the extract was concentrated to near dryness. Ethyl acetate or acetone was chosen as the dissolving solvent. Subsequently, dispersive-SPE was used for cleanup, and the type and quantity of sorbents (GCB, PSA and activated carbon) were tested in the experiments. The best results were when acetone was used to dissolve and 30 mg each of GCB and PSA for cleanup. In this condition, recoveries of pesticides analyzed were between 52-117% with RSD below 10%, and LOQ ranged from 10 to 20 microg/kg. This method was simple, effective and efficient, and can protect the GC system to some extent.
authors.affiliation: College of Science, China Agricultural University, Beijing, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Ge
authors.forename: Yijun
authors.initials: Y
authors.lastname: Wu
authors.forename: Shuren
authors.initials: S
authors.lastname: Jiang
authors.forename: Fengmao
authors.initials: F
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D002138:Calibration; D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods; D005506:Food Contamination / Q000032:analysis; D006801:Humans; D009943:Organophosphorus Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D015203:Reproducibility of Results; D012997:Solvents; D053260:Soot / Q000737:chemistry*; D018724:Spinacia oleracea / Q000737:chemistry*
chemical_list: D000588:Amines; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D010575:Pesticides; D012997:Solvents; D053260:Soot