title: [Determination of dimethyl sulphate in environmental samples with GC-ECD].
abstract: OBJECTIVE
  To develop an gas chromatography-electrophoretic capture detection (GC-ECD)method for determining dimethyl sulphate (DMS) in environmental samples.
  
  
  METHODS
  The environmental samples were dissolved with acetone and the DMS was reacted with KI. The reaction product of methyl iodide was extracted with Hexane and determined by GC-ECD, with HP-5 (30.0 m x 0.32 mm x 0.25 microm) as column, high purity nitrogen as carries, 60 degrees C for column temperature and 240 degrees C for ECD and injector temperature, and 5:1 for split ratio.
  
  
  RESULTS
  The linear range appeared from 0.05 microg/mL to 2.0 microg/mL. The detection limit was 0.0011 microg/mL. The precision [measured by relative standard deviation (RSD)] of peak area and reserved time for the standard solution was 4.95% and 0.15% respectively for intra-day detections, and 5.99% and 0.83% respectively for inter-day detections. Satisfactory results were obtained for the analysis of environmental samples. The RSD for the water and soil samples were 9.6% and 7.5% respectively and the recoveries were 76.0%-85.0% and 82.0%-110.0% respectively.
  
  
  CONCLUSIONS
  The method was simple, accurate, sensitive and applicable for DMS analysis in environmental samples.
authors.affiliation: Department of Sanitary Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
authors.forename: Xuan-fu
authors.initials: XF
authors.lastname: Qin
authors.forename: Xia-li
authors.initials: XL
authors.lastname: Zou
authors.forename: Yuan-qian
authors.initials: YQ
authors.lastname: Li
authors.forename: Hong-yan
authors.initials: HY
authors.lastname: Zeng
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D004586:Electrophoresis / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis*; D009153:Mutagens / Q000032:analysis; D013463:Sulfuric Acid Esters / Q000032:analysis*
chemical_list: D004785:Environmental Pollutants; D009153:Mutagens; D013463:Sulfuric Acid Esters; C007482:dimethyl sulfate