Retention behaviour of polycyclic aromatic hydrocarbons in supercritical fluid chromatography on various chemically bonded stationary phases with carbon dioxide as a mobile phase

The retention behaviours of polycyclic aromatic hydrocarbons in superficial fluid chromatography have been studied on various chemically bonded stationary phases with carbon dioxide as the mobile phase. The solute retention is mainly controlled by its molecular size as in liquid chromatography and its dipole moment also determines the elution order on silica and non-endcapped octadecylsilica phases. Phenyl bonded phases such as diphenyl and naphthylethyl show intermediate characters between silica and well covered octadecylsilicas.