Sampling and analysis of Polycyclic Aromatic Hydrocarbons (PAH) and oxygenated PAH in diesel exhaust and ambient air

In this work, diesel engine emissions were investigated in a dilution tunne l. The gas/particle partitioning and the different size fractions of Polycy clic Aromatic Hydrocarbons (PAH) and oxygenated derivatives (oxy-PAH) were studied. In addition, measurements were carried out near a motorway in Pari s for comparison to the tunnel test results. First, it is shown, that the g aseous phase of the PAH is predominant (up to 20 times) with respect to the particulate phase, and that the PAH and their derivatives are mainly adsor bed in the very fine particulate fraction (particle size under 0.4 mum) Sec ond, the oxygenated PAH, neglected in the majority of previous studies, are predominant with respect to the PAH.