The concentrations of heavy metals(Cd,Pb,Zn,As,Cr,Mn,Ni,Cu) in the surficial sediments collected from Dagu estuary of Bohai Bay were determined with U.S.EPA-3051 method to evaluate pollution status and distribution.The results showed that Cu and As were considered as the major heavy metal pollutants in the surficial sediments,which were higher than the regional environmental background values.But they did not exceed the grade-three marine sediment quality of China(GB18668-2002).The highest Cu concentration(...