Abstract
This chapter uses 95 lead-free gasoline (95-LFG) and a premium leaded gasoline (PLG) to investigate polycyclic aromatic hydrocarbon (PAt-I) aerosol emission from a gasoline powered engine on a dynamometer. The emission rate of 21 individual PAHs in the engine exhaust, gasolines, and ambient air were determined by a GC/MS. The total-PAH emission rate was found to increase with increased cruising speeds for both 95-LFG and PLG engines. The total-PAH emission rate of 95-LFG engine was quite similar to that of PLG at a cruising speed of 40 km/hr. It was significantly lower than that of PLG at idling condition and at cruising speeds of 80 and 110 km/hr. Naphthalene (Nap) has the highest concentration in the liquid phase of both 95-LFG and PLG in which it accounts for respectively 98.3% and 76.6% of the total PAH. Practically, the majority of total PAH mass emission in the engine exhaust originated from the gasolines.
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