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Sunday, 22 December 2013

FLAME IONISATION DETECTOR IN GAS CHROMATOGRAPHY

  • Mass sensitive detector.
  • Operates by mixing hydrogen with carrier gas and burning it at a jet in a stream of air.
  • A collector electrode is placed above the flame.
  • P.D. is set up between the jet and the collector electrode.
  • The jet is at -ve potential w.r.t. the collector.
  • Organic compounds produce ions and electrons when burnt.                                                                     
  • Electrical current is set up whose magnitude is proportional to the mass flow of the sample.


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