title: [Determination of 23 organochlorine pesticides in soil and sediment by gas chromatography coupled with dual columns and dual electron capture detectors].
abstract: Gas chromatography (GC) coupled with dual columns and dual electron capture detectors (ECD) was established to determine 23 organochlorine pesticides in 5 soil and 5 sediment samples. Microwave assisted extraction and solid phase extraction with a Florisil column and sulfur cleanup with copper powder were used in sample pre-processing. Chromatographic analysis was performed on DB-XLB and DB-1701 capillary columns by internal standard method. This method showed good extraction efficiency, high sensitivity and good reproducibility. In the same linear range of 0.005 - 0.5 mg/L of 23 pesticides, the correlation coefficients were higher than 0.997. The average spiked recoveries were 50% - 119% with the relative standard deviations (RSDs) of 0.9% - 16.1% (n = 6) in 5 soil samples, and were 52% - 120% with RSDs of 0.3% - 28.4% ( n = 6) in 5 sediment samples, respectively. The detection limits were 0.000 05 -0.000 5 mg/kg. The results indicate that this method is suitable for the determination of the 23 organochlorine pesticides in soil and sediment samples.
authors: Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing 210009, China.
authors: Hengyi
authors: H
authors: Zhu
authors: Wenyuan
authors: W
authors: Liu
authors: Xining
authors: X
authors: Ding
authors: Yonggang
authors: Y
authors: Zhao
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D004583:Electrons; D019015:Geologic Sediments / Q000032:analysis; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants