Abstract

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.

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