Several selective polysiloxane stationary phases were evaluated for the resolution of nitrogen-containing polycyclic aromatic compounds (N-PAC) in coal tar fractions by capillary column gas chromatography. A new liquid crystalline polysiloxane exhibited the highest selectivity for isomeric alkylated 3- and 4-ring N-PAC, whereas a polarizable biphenyl polysiloxane and a moderately polar crown ether-substituted polysiloxane were more applicable for the analysis of 2- and 3-ring N-PAC. The thermal stabilities of these phases made them suitable for GC-MS applications.
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Bayona et al. (1987) studied this question.
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