title: A simplified procedure for the determination of organochlorine pesticides and polychlorobiphenyls in edible vegetable oils.
abstract: A one-step extraction-purification multiresidue method for the determination of 14 organochlorine pesticides (OCPs) and 7 polychlorinated biphenyls (PCBs) in edible vegetable oils based on matrix solid-phase dispersion (MSPD) has been developed. The experimental parameters affecting the recoveries and the efficiency of the cleanup procedure were thoroughly evaluated. Under an optimised condition, 0.5 g of oil sample was blended with 3.5 g of sulfuric acid-impregnated silica and 0.8 g of silica gel was used as co-column absorbent. The PCBs and OCPs were eluted by 10 mL of n-hexane/dichloromethane (70:30, v/v) and determined by gas chromatography equipped with an electron capture detector (GC-ECD). Good recoveries were obtained in the range of 69.6-105.3% with relative standard deviations (RSD) values below 15% in most cases. The limits of detection (LOD), based on a signal-to-noise ratio (S/N) of 3, were in the range of 0.04-0.74 ng/g.
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Beijing 100193, PR China.
authors.forename: Jindong
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Beijing 100193, PR China.
authors.forename: Donghui
authors.initials: D
authors.lastname: Liu
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Beijing 100193, PR China.
authors.forename: Tong
authors.initials: T
authors.lastname: Wu
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Beijing 100193, PR China.
authors.forename: Wenting
authors.initials: W
authors.lastname: Zhao
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Beijing 100193, PR China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Beijing 100193, PR China. Electronic address: wangpeng@cau.edu.cn.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D006843:Hydrocarbons, Chlorinated / Q000032:analysis / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis; D010938:Plant Oils / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D010938:Plant Oils; D011078:Polychlorinated Biphenyls
keywords: Edible vegetable oils; Matrix solid-phase dispersion; Organochlorine pesticides; Polychlorinated biphenyls