CONCENTRATIONS OF ORGANIC POLLUTANTS IN SURFACE SEDIMENTS OF THE SANSHA BAY AND RISK EVALUATION

PCBs、PAHs and OCPs were measured by means of gas chromatography-mass spectrometry for the surface sediments collected from the Sansha Bay.The results showed that the concentrations of PCBs、PAHs and OCPs were 1.28、61.76 and 1.18 ng/g respectively.Compared with the research results earlier, PCBs content decreased obviously.It means that the pollution state of PCBs had been controlled effectively.According to the ratio of P/A and Fl/Py, the release from combustion of fuel was one of the most major sources of PAHs in this area.HCHs and DDTs were the main pollutants in OCPs.Source analysis suggests that HCHs and DDTs were mainly from historical residues of early usage, and DDTs were decomposed by anaerobic microbial degradation in surface sediment.In conclusion, the concentration of PCBs、PAHs and OCPs suggest that the potential risk of environmental pollution was low in the Sansha Bay for the time being.