[Research on PAHs fingerprints of vehicle discharges]

Air samples of 14 PAHs were collected from vehicle discharges of different types, oils, and mileages and analyzed by HPLC. It showed that the total PAHs discharged from the vehicle in 30 minutes were 41.53-121.1 micrograms/m3, among which, BaA was the most predominant, about 33.3%, followed by Naphthalene, Benzo (ghi) pyrene and In (1,2,3-cd) pyrene, about 16.8%, 12.9% and 12.1%, respectively. Diesel vehicle discharged more total PAHs compared to gasoline vehicle. The two vehicles all exhausted much BaA and Naph, however diesel vehicle mainly emitted Ac, Fluor, Bghip, In, while gasoline discharged mainly Bghip, In, BkF. PAHs with five or more rings in gasoline discharges were relatively higher than those in diesel discharges, however to 3-ring PAHs, diesel vehicle produced more than gasoline vehicle. As for vehicle of different mileage, there was a clear increase for almost all PAHs, especially Flur, Py, BaP, Bghip.