Concentration of Hydrocarbons on Silica Gel Prior to Gas Chromatographic Analysis

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Abstract
In the determination of substances in various atmospheres by gas chromatography the sample often must be concentrated prior to analysis. Silica gel at dry ice-acetone temperatures has been found to be a satisfactory adsorbant for concentration of hydrocarbons and sulfur containing compounds. In the present work recovery efficiencies are obtained for a number of four and five carbon paraffins and olefins. Isomerization reactions of olefins on silica gel at elevated temperature were investigated. Losses of very light hydrocarbons are discussed. Reptroducibilities are given for the analyses of several three, four and five carbon hydrocarbons existing at concentrations between, 0.005 and 0.2 ppm in synthetic smogs.