GEOCHEMICAL BEHAVIOUR OF THE POLLUTANTS IN SURFACE SEDIMENTS OF DAYA BAY
ZHENG Qinghua LIANG Ziqiang HE Yueqiang WEN Weiying (South China Sea Institute of Oceanology, Academia Sinica, Guangzhou 510301)
The particle size of the surface sediments in Daya Bay mainly consisted of silty clay, clay silt and silt. The sediments were contaminated chiefly by sulfides and some heavy metals (Pb, Zn, Hg, As). Among them the pollution phenomanon of sulfides, Pb and Zn widely existed in the Bay. The transfer of these pollutants from seawater forward to sediments resulted in comprehesive action of factors, e.g., adsorption of suspended matter, or organisms and sediments etc. There is a certain correlation between some elements in the sediments, but there is not a clear correlation of sediments with the clay content of which their particle size consisted and with the environmental factors of seawater.