GAS-CHROMATOGRAPHY OF TITANS ATMOSPHERE .6. ANALYSIS OF LOW-MOLECULAR-MASS HYDROCARBONS AND NITRILES WITH BPX5 CAPILLARY COLUMNS

Wall-coated open-tubular capillary columns (0.15 mm I.D., 12 and 25 m long with a 0.25-mu m film thickness and 12 m long with a 2-mu m film thickness with a chemically bonded stationary phase (5% phenyl-95% dim ethylpolysiloxane) were used for the gas chromatographic analysis of v arious mixtures of low-molecular-mass saturated and unsaturated hydroc arbons and nitriles. Retention indices are given for these solutes at 30 degrees C. Van Deemter curves were also plotted for propionitrile, n-hexane and benzene at 30 degrees C for both film thicknesses. Both c olumns proved efficient and yielded good resolution. The analysis of t he experimental band broadening on the basis of Golay's equation indic ates the important role of the instrumental contribution to band broad ening for columns with thin films of stationary phase.