The Selective Indium Halide Flame Emission Detector --a Potentially Useful Detector for Gas Chromatography

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Abstract
A sensitive detector for selective detection of nanogram quantities of halogenated organic compounds is described. Linear response exists from the limit of detection to at least three decades above the limit of detection for brominated and iodinated compounds and six decades for chlorinated compounds. The detector, which is extremely stable and reproducible in response, consists of a stainless steel burner into which the sample and air are introduced and a concentric quartz jacket into which H2 is introduced. A primary flame is supported on the stainless steel burner head and a secondary flame at the tip of the quartz jacket. Sample entering the primary flame is decomposed, and the decomposition products pass over a screen containing indium. Any sample containing chlorine, bromine, or iodine produces InCl, InBr, or Inl, respectively; the InCl, InBr, or Inl emission from the secondary flame is monitored spectrophotometrically. The detector should be of considerable use for the selective measurement of small amounts of halogenated compounds, such as pesticides, in gas chromatographic spearations.

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