中文摘要：

运用气相色谱质谱仪（GC-MS）测定辽东半岛西部海域沉积物中16种优控多环芳烃（PAHs）含量,探讨其分布特征、来源及潜在生态风险。结果表明：16种PAHs质量分数为（173.0±20.8）×10-9,呈现出中—南部沉积物PAHs含量高、北部含量低的分布特征;与国内外其他海区沉积物PAHs含量相比,研究区PAHs属轻度至中度污染;北部沉积物中的PAHs主要来源于石油燃烧和原油污染,中—南部PAHs主要来源于草、木材和煤燃烧;Ne5,Ne9,Ne10,Ne11,Ne12,Ne15和Ne18站位沉积物中苊浓度高于效应低值w（ERL）,偶尔会产生生态毒性效应,其他站位沉积物中PAHs的潜在生态风险较低。

英文摘要：

Sixteen polycyclic aromatic hydrocarbons （ PAHs） content was determined using GC-MS method from surface sediments collected across the western sea of Liaodong Peninsula. The distribution,source and ecological risk were discussed. The results show that the average concentration of PAHs was （ 173. 0 ± 20. 8） × 10 -9,indicating low to moderate contamination levels of PAHs compared with reported values for other coastal sediments in China and other countries. The relatively higher concentrations were observed in the middle-southern sea of study area,whereas relatively lower PAHs concentrations in the north. Source identification implied that PAHs in the north of this area mainly comes from petroleum combustion and spilled oil. PAHs in the middle-southern region were closely associated with grass,wood and coal burning. An ecological risk assessment of PAHs,based on the effect range-low （ ERL） quotients,suggested that adverse biological effects may take place in several sites （ Ne5,Ne9-Ne12,Ne15 and Ne18） caused by acenaphthene occasionally.