Investigations on Equilibrium Headspace -- Open Tubular Column Gas Chromatography

Abstract

After a brief summary of the basis of gas chromatographic headspace analysis and the available instrumentation, the utilization of this technique with open-tubular columns is discussed in detail. The advantages of such systems are outlined, and it is demonstrated that it does not result in any deterioration of column efficiency. Headspace sampling requires that somewhat longer open tubular columns with smaller internal diameter are uses, and that if possible, helium is applied as the carrier gas. Data are given proving the accuracy of split ratio, the repeatability of analysis, and the linearity of the split system. The special feature of headspace analysis, enrichment of lower-boiling sample components, is discussed and illustrated. Finally, the application of headspace gas chromatography with open-tubular columns is illustrated with a number of natural samples.