Polycyclic Aromatic Hydrocarbons In North Yellow Sea Region: Levels, Sources And The Fluxes Of Deposition

Air samples were collected in November of 2008 to September of 2009 from three sites located in Zhangzi Island, Laohutan Station and Xiaomai Island of North Yellow Sea region, to determine the levels of atmospheric particle and gas-phase∑15PAH, and calculate the fluxes of deposition. The results show that the atmospheric concentration of PAHs in Laohutan Station, Xiaomai Island and Zhangzi Island three regions in turn. Polycyclic aromatic hydrocarbons in various gas stations are the main components of 2+3 ring form. But in particle component is 4 ring PAHs dominated. In the heating period are the main pollutants from fossil fuel combustion, followed by the pollution caused by traffic. Rather than the heating period as motor vehicle exhaust emissions is a major source of PAHs in the atmosphere.The results show that, average fluxes of dry deposition were 10196 ng m-2 d-1(Zhangzi Island), 16749 ng m^-2 d^-1(Laohutan Station) and 18982 ng m^-2 d^-1(Xiaomai Island), respectively. The deposition fluxes of PAHs in gas-phase were higher than those in particle phase, which suggest that gas deposition dominate loadings to the sea. The higher fluxes of deposition occur in heating period (November 2008 to March 2009). The absolute value of gas PAHs deposition were larger difference between heating period and non-heating period, but the compositional profiles were all based on 2+3 ring compounds; the 4 ring compounds were dominating in particle PAHs deposition in heating period, conversely, the 5+6 ring compounds were mainly associated with non-heating period.