Identification of compounds in gasoline range mixtures using combined group-type and capillary GC separations

Summary A procedure is described to improve the identification of the hydrocarbon isomers separated on a single capillary column. Group-type PNA separation was combined with capillary GC analysis. Different paraffin and naphthene groups separated by carbon number on the 13X column of a PNA-analyzer were heart-cut and analysed off-line by capillary GC. Capillary GC chromatograms of the trapped groups compared to that of the original sample helped to identify the peaks (at least by group-type), to clear up mixed peaks and to find out the ratio of the compounds co-eluting in that particular peak. Results were used to create identification tables for different types of naphthas. Presented at Balaton Symposium on High Performance Separation Methods, Siófok, Hungary, September 1–3, 1999