首页 | 本学科首页   官方微博 | 高级检索  
     


Multidimensional separation of isomeric species of chlorinated hydrocarbons such as PCB,PCDD, and PCDF
Authors:G. Schomburg,H. Husmann,E. Hü  binger
Abstract:
A multidimensional GC-system containing two capillary columns of different polarities, operated within a double oven instrument, was used for the optimized separation of complex isomeric mixtures of various types of chlorinated aromatic compounds such as PCB, PCDD, or PCDF. Electron capture was applied parallel to flame ionization detection to obtain sensitive signals of the PCB or PCDD and the n-alkane standards required for identification by Kovats indices, respectively. Electron capture detection within a valvelessly operated MDGC system forced changes in the usual instrumental set-up, the live-switching coupling piece being located within the second oven of the double oven instrument. This oven is operated isothermally to ensure optimal and interference-free detection, for stable flow conditions within the coupling piece and for the determination of the isothermal retention indices (Kovats), which are much more suitable for identification by retention than the so-called “linear” indices.
Keywords:Multidimensional gas chromatography, GC  Capillary columns  Electron capture detection  Flame ionization detection  Double oven instrument  Kovats indices  Halogenated aromatic hydrocarbons
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号