Fast analysis of PAH by GC and GC/MS using isomer specific GC capillary columns

The required separation of polycyclic aromatic hydrocarbons (PAH) by GC, to meet regulatory requirements, depends largely on column selectivity. Liquid crystal (LC) capillary columns are highly selective for PAH separation. In the current investigation analysis and separation of PAH on columns coated with only the LC stationary phase, the combination of LC and non-polar stationary phase and only non-polar stationary phase, have been studied. The complete separation of isomeric PAH in the mixture of 16 priority PAH is achieved on the LC column. The inherent advantage of higher efficiency for microbore columns compared to conventional 0.25 mm internal diameter (ID) columns of the same length, in combination with the selectivity of the LC stationary phase, resulted in the fast analysis of 16 PAH on the columns with the combination of LC and non-polar stationary phases. Using this column, designated as the ICB-PAH column, separation of the USEPA 16 priority PAH in addition to other isomeric PAH (except benzo[j]fluoranthene) is achieved. Complete separation of 16 priority PAH was achieved in less than 5 minutes on a 6 m 0.10 mm ID column, and in less than 7 minutes on a 15 m 0.25 mm ID column. Separations of 16 priority PAH plus five additional isomeric PAH on LC, non-polar, and a combination of LC and non-polar stationary phase columns are discussed.