title: [Determination of organochlorine pesticide residues in the roots of Zanthoxylum nitidum by GC-MS].
abstract: OBJECTIVE
  To determine the contents of organochlorine pesticide residues in the roots of Zanthoxylum nitidum and provide scientific foundation for the quality control and standard establishment.
  
  
  METHODS
  GC-MS method with selected ion monitoring (SIM) mode was used to analyze the contents of organochlorine pesticide residues in the roots of Zanthoxylum nitidum. The samples were extracted with acetone and ultrasonic vibrations, and the analytical samples were purified by anhydrous sodium sulfate-anhydrous magnesium sulfate -PSA -C18-PestiCarb -phase extraction (SPE) cartridge.
  
  
  RESULTS
  Eight kinds of organochlorine pesticide were detected simultanously. Small amounts of OP-DDT were detected in samples 1, 4, 5, 6, 11 and 12, no organochlorine pesticide residue was detected in other samples. The RSD of precision ranged from 0.89% to 2.21%, and the average recovery ranged from 85.33% to 103.70%, with the RSD less than 4%.
  
  
  CONCLUSIONS
  The contents of organochlorine pesticide residues in the roots of Zanthoxylum nitidum are less than 0.2 ppm. This method is sensitive, good purifying, and suitable for analyzing organochlorine pesticide residues in the roots of Zanthoxylum nitidum.
authors.affiliation: School of Pharmaceutical Sciences, Guangxi Medical University, Nanning 530021, China. jaj8899@yahoo.com.cn
authors.forename: Ai-Jun
authors.initials: AJ
authors.lastname: Jiao
authors.forename: Jie
authors.initials: J
authors.lastname: Feng
authors.forename: Mao-Xiang
authors.initials: MX
authors.lastname: Lai
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D018517:Plant Roots / Q000737:chemistry*; D011786:Quality Control; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods; D012997:Solvents / Q000737:chemistry; D032106:Zanthoxylum / Q000737:chemistry*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D012997:Solvents