[Geographical distribution of DDTs, PCBs and phthalate esters in coastal surface sediments of Yellow Sea].

Using the data of the second survey of marine pollution baseline, the geographical distribution and constitution were investigated, and preliminarily evaluated the ecological risk based on the corresponding sediment quality guidelines. The results showed that, the sites with high concentrations of PAEs over the corresponding guidelines were mainly located in the Dalian Bay (1 389.8 ng/g) and surrounding sea areas of Lvshun (1 928.0 ng/g), and the main components of PAEs were DBP and DEHP. Only at the outlet of Dalian Bay, the concentration of PCBs (24.2 ng/g) was slightly higher than the ERL guideline level (22.7 ng/g), while the sites with concentrations exceeding the ERL guideline (1.58 ng/g) were mostly situated in the coastal areas of Dalian Bay (6.3-7.6 ng/g), Yantai-Weihai (4.5-10.3 ng/g), Jiaozhou Bay (5.5-21.2 ng/g) and Haizhou Bay (27.4-62.9 ng/g), and the content at one site was even above the ERM guideline (46.1 ng/g). The compositions of DDT indicated that, the main metabolites of p, p'-DDT was p, p'-DDD, and there may be new inputs of DDT in the coastal areas of Dalian Bay, Weihai, Jiaozhou Bay and Haizhou Bay, as well as the outer sea area of Shandong Peninsula, where the possible sources were technical dicofol and/or technical DDT. The surface sediments in these sea areas had certain ecological risk, especially at one individual site in the Haizhou Bay with much higher ecological risk.