Distribution Feature And Source Discrimination Of Pahs In Northern Taihu Lake

Polycyclic aromatic hydrocarbons(PAHs)are one of the most important kinds of persistent organic pollutants(POPs), which are widely exist in the environment and may cause potential carcinogens to human. United States Environmental Protection Agency(USEPA) have recommended 16 PAHs compounds as priority pollutants. PAHs molecular structure are stable and undegradable in natural environment, which are high lipophilicity,thus the PAHs in the liquid environment can be easily distributed in the sediments and organisms. This paper chooses method of extracting PAHs from untreated wet sediment as extract method Meanwhile optimize several factors which have impact on the efficiencies and recoveries of extracting. The studys mainly select sediment, pore water and overlying water samples from northern Taihu Lake, analyse the distribution features of PAHs from northern Taihu Lake and distinguish the sources from which the pollutants may come. The results show 16 PAHs which the United States Environmental Protection Agency(USEPA) have recommended as priority controlled pollutants are detected in all reseach areas.The PAHs from northern Taihu Lake mainly consist of two,three and four ring compounds and the large part of total PAHs content appeared in Meiliang Bay and Zhushan Bay. There is a trend of decrease of PAHs from shore to inner water and from north to south.In northern Taihu Lake,the PAHs come as a result of petroleum pollution and natural lithification as well as combustion of fossil fuels at high temperature.There are also some correlations between PAHs and TN,TP,OC and EN.The content of PAHs in sediment, pore water and overlying water reduce one by one and the toxicity do not casuse notable health threat to aquatic.