title: [Simultaneous determination of the residues of pyrethriods, organochlorines and polychlorinated biphenyl congeners in unpolished rice by gas chromatography with gel permeation chromatography purification].
abstract: The separation behaviors of organochlorine pesticides, pyrethriod pesticides, polychlorinated biphenyl congeners (PCBs) and unpolished rice matrixes were systematically investigated with gel permeation chromatography (GPC) because of its outstanding capability in removing lipid and pigments from sample solutions. A separation method was proposed for the quantitative determination of 35 pesticides and PCBs in unpolished rice by GPC and gas chromatography simultaneously. Samples were extracted with ethyl acetate, purified by GPC, and then determined by gas chromatography and electron capture detection (GC-ECD). With external standard method, the recoveries of 3 standard addition levels of low, medium, high concentrations were 70.1% - 107.4%, 70.3% - 109.9%, 70.8% - 109.5%, respectively with relative standard deviations from 2.3% to 13.3%. The detection limits were 0.07 microg/kg for organochlorines and PCBs, and 0.44 microg/kg for pyrethriods.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Chu
authors.forename: Weike
authors.initials: W
authors.lastname: Zhong
authors.forename: Shujuan
authors.initials: S
authors.lastname: Li
authors.forename: Youzhao
authors.initials: Y
authors.lastname: He
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D002850:Chromatography, Gel / Q000379:methods; D005504:Food Analysis; D005506:Food Contamination / Q000032:analysis; D012275:Oryza; D010573:Pesticide Residues / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis*
chemical_list: D010573:Pesticide Residues; D011078:Polychlorinated Biphenyls