Polycyclic aromatic hydrocarbons from gasoline-engine and liquefied petroleum gas engine exhausts.

Exhaust gases from an internal combustion engine, alternatively powered by gasoline or by liquefied petroleum gas, were analysed for polynuclear aromatic hydrocarbons. The engine operated a lift truck for the handling of warehouse goods. A combined condensation-filtration apparatus was constructed for sampling of the exhausts. The basic steps of the analytical procedure are summarized here. Several polycyclic aromatic hydrocarbons were identified and determined both in the gasoline engine and in the liquefied petroleum gas engine exhausts. In the liquefied petroleum gas engine exhausts, all detected polynuclear hydrocarbons were present in significantly lower concentrations.