Eight Polycyclic aromatic hydrocarbons(PAHs)were measured in 10 surface water samples of Songhua River,China in January,February and May 2007.It was observed that the sum of PAHs concentrations ranged from 2.980 to 0.006μg/L in Jan.,from 3.126 to 0.016μg/L in Feb.,and from 0.485 to 0.008μg/L in May.The composition of PAHs was surveyed,and the results demonstrated that naphthalene was dominated in surface waters with a mean value of 1.507,1.287 and 0.153μg/L in three months respectively. Furthermore,distribu...