Comprehensive two-dimensional gas chromatography analysis of high-ethanol containing motor fuels.

A comprehensive 2-D GC (GC x GC) instrument equipped with a flow-switching modulator was used to determine the concentration of ethanol and eight other alcohols in a retail pump sample of E85 fuel. E85 is a mixture of ethanol and gasoline where the ethanol concentration can range from 70 to 85 vol%. The increased peak capacity and selectivity generated by GC x GC analysis allowed the alcohols to be fully resolved from the gasoline hydrocarbons.

Solvation parameter model of comprehensive two-dimensional gas chromatography separations.

A solvation parameter model was used to generate comprehensive two-dimensional gas chromatography (GC x GC) retention diagrams for 54 solutes on four different stationary phase combinations. Retention diagrams are plots used to predict the relative position of solutes in GC x GC chromatograms. In this study, retention diagrams were based entirely on solute and stationary phase descriptors taken from the literature.