Optimization of the gas-chromatographic determination of airborne halocarbons

Summary Airborne C₁- and C₂-halocarbons can be determined by cartridge sampling, gas chromatography and electron capture detection. High accuracy is achieved in the concentration range typical for rural and forest air, when the following components of the analytical train are meticulously optimized: enrichment on adsorption cartridges, thermodesorption, cryofocussing, capillary gas chromatography and electron capture detection. The parameters associated with sample collection, i.e. type and properties of adsorbent, dimensions and design of the cartridge, temperatures, and gas flows must be judiciously balanced under consideration of the prevalent air concentrations and the dynamic range of the ECD, in order to achieve standard deviations of 10% or less for replicate analyses.

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Optimierung der gas-chromatographischen Bestimmung von Halogenkohlenwasserstoffen in Luft