Application of a miniaturised packed gas chromatography column and a SnO2 gas detector for analysis of low molecular weight hydrocarbons with focus on ethylene detection

Abstract In this paper the combination and application of a silicon based miniaturised gas chromatography (GC) column packed with Carboxen 1000 and a gas detector based on a commercial SnO 2 metal oxide sensor are described. Target analytes are gas mixtures containing hydrocarbons with low molecular weight from C1 and C2 and ethylene as main target gas. The detector achieved a resolution of at least 1 ppmv related to ethylene gas. The combination of the detector with the miniaturised GC-column provides a linear behaviour between the injected ethylene gas volume and the related peak area in the chromatogram with a resolution of 2 nl. Examination of the GC-performance gave HEPT-values of about 0.7 mm and chromatographic resolutions of 100% in most cases using a gas mixture containing CO 2 , nitrogen, acetylene, ethylene, methane and ethane with synthetic air as carrier gas.

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