Reaction Mechanism in an lonization Detector with Tunable Selectivity for Carbon, Nitrogen and Phosphorus

Abstract

An ionizatlon detector for gas chromatography is described, whose selectivity can be changed such that it can be operated as a universal detector with the same properties as an FID, further as a specific phosphorus detector and as a selective detector for both nitrogen and phosphorus. The latter working mode Is used if operated as a selective nitrogen detector. This detector is a modified FID and contains a small glass bead between flame and collector electrode, which can be heated electrically. The changeover between all these three working modes is simple, quick and needs no manipulation on the hot detector Itself. All necessary operations are done at the control unit only. Some possible reaction mechanisms are discussed, which have been found useful to explain the Influence of instrumental working parameters as well as the specific properties of this detector.