GC DETERMINATION OF HALOGENATED OLEFINS BY PHOTOIONIZATION AND HALL ELECTROLYTIC CONDUCTIVITY DETECTORS IN SERIES IN MATRICES OF HYDROFLUOROCARBONS AND HYDROCHLOROFLUOROCARBONS

Gas chromatography (GC) with photoionization (PI) and Hall electrolyti c conductivity (ElC) detectors connected in series, has been used for the determination of chlorofluorinated olefins. The separation of diff erent standard solutions containing eight chlorofluorinated ethenes in nitrogen and in halogenated matrices has been performed in wide bore capillaries, 0.53 mm i.d,. and normal capillaries, 0.32 mm i.d.. The q uality of separation is obviously influenced by their limited load cap acity and by the response time of the Hall detector. At concentrations 1-150 mu L L-1 halogenated olefins, both PI and ElC detectors have li near response and can detect minimum levels of 0.2-0.5 ng and 0.4-1.2 ng, respectively. The PID is particularly selective toward halogenated olefins and is extremely useful for the determination of traces of un saturated halogenated hydrocarbons in a matrix of saturated homologues . The results of this work are of great interest for the detection of chlorofluorinated olefins, highly toxic compounds usually formed as by -products in the industrial production of hydrofluorocarbons and hydro chlorofluorocarbons.