渤海北部表层沉积物中多环芳烃分布与来源分析

利用GC-MS对2014年5月和8月渤海北部表层沉积物中16种优先控制PAHs含量进行了分析,探讨了5月和8月PAHs的分布特征和分子组成,分析了渤海北部表层沉积物中PAHs的污染水平、主要来源、潜在毒性和生物效应。研究表明,渤海北部表层沉积物中16种PAHs5月份含量范围为(88.5~187.7)10-9,平均含量为125.210-9,8月份含量范围为(99.6~199.3)10-9,平均含量为126.510-9;沉积物PAHs为中~低度污染水平,季节变化不明显,潜在生物效应很小;致癌PAHs潜在毒性处于中低水平。沉积物中PAHs以低环为主,高值区集中在辽东湾西南部以及金州湾和普兰店湾附近海域;比值法和主成分分析法判定沉积物中PAHs为石油来源和燃烧来源同时存在。

Distribution and source identification of polycyclic aromatic hydrocarbon of surface sediments from the North Bohai Sea

The surface sediments from the north Bohai Sea were analyzed for 16 US EPA priority polycyclic aromatic hydrocarbons (PAHs) using gas chromatography-mass spectrometer (GC-MS) in May and August of 2014.The temporal and spatial distributions and composition of PAHs were studied,and pollution level,main sources,potential toxicity and biological effects were discussed.The total concentration of the 16 US EPA priority PAHs in surface sediments ranged from (88.5~187.7)10-9 dry weight with a mean concentration of 125.210-9in May,and the total concentration of PAHs ranged from (99.6~199.3)10-9 with a mean concentration of 126.510-9 in August,sediments can be characterized as lowly to moderately PAHs pollution,and biological effect would occur rare.The potential toxicity of carcinogenic PAHs was low-medium level.The high concentration areas of PAHs were usually in the southwest of Liaodong Bay,and the sea area of Jinzhou Bay and Pulandian Bay.LPAHs have larger percentage than HPAHs.Isomeric ratios and principal component analysis (PCA) were used in source identification,the petroleum source and combustion source were existed in the north Bohai Sea.