HPLC and sources of typical PAHs in Chengdu urban road dust

Polycyclic aromatic hydrocarbons(PAHs)has been concerned because of their toxicity,bioaccumulation,and semi-volatile,and persistence in the environment.The PAHs in urban road dust can reflect the emissions of PAHs in the adjacent areas of the road to some extent.This paper proposes a separation and analysis method of phenanthrene and anthracene,fluoranthene and pyrene,benzo[a]anthracene and chrysene in urban road dust with the precision of better than 4%,detection limit(mass fraction)of(1.6~4.7)×10-9 and recoveries of 72%~92%.The PAHs in road dust from different functional areas of Chengdu have been determined by this method.The total mass fraction is(1.57~7.15)×10-6.The content distribution and source apportionment of PAHs indicate that PAHs in the road dust are mainly from emissions of the sampling sites nearby.