中文摘要：

在渤海湾天津段潮间带及邻近区域的主要入海河流和近海采集86个表层沉积物样品，通过GC／MS对16种优控多环芳烃（PAHs）的含量进行分析，结果表明：潮间带44个样品的PAHs平均含量为（140．0±84．1）ng／g，与近海样品的PAHs含量[（161．6±38．7）ng／g，n=26]相当，但远低于河流样品的PAHs含量[（452．7±206．0）ng／g，n=13]；潮间带样品的PAHs含量呈现“北区高南区低”（以天津港码头为界）的空间分布特征，与该区域沉积物粒度及黑碳和总有机碳的含量呈现显著的相关性；从PAHs的组成上可以显示潮间带沉积环境具有一定的特殊性；潮间带样品PAHs的BaP毒性当量含量平均为（24．5±21．1）ng／g；根据加拿大魁北克省海洋沉积物中PAHs的质量评估标准，渤海湾表层沉积物中PAHs的污染具有一定的生态风险．

英文摘要：

86 surface sediment samples were collected from the intertidal zone of Bohai Bay, adjacent main rivers and offshore area, and were analyzed for 16 priority polycyclic aromatic hydrocarbons （PAHs） by GC/MS. The average PAHs concentration of surface sediment samples in the intertidal zone of Bohai Bay was （140.0±84.1）ng/g （n=44）, which was close to the value from offshore samples [（161.6±38.7）ng/g, n=26], but significantly lower than that in the samples from main rivers [（452.7±206.0）ng/g, n=13]. Distinct spatial pattern of PAHs concentrations could be seen with ＂higher in the north while lower in the south＂ （divided by Tianjin Port） in the intertidal zone, which significantly related to the sediment granularity and the concentrations of black carbon （BC） and total organic carbon （TOC）. Variation of percentage of low-molecule-weight PAHs in the intertidal zone demonstrated its special sedimentary environment. Average of BaP-equivalent carcinogenic concentrations was （24.5±21. 1）ng/g in the intertidal zone sediments. Risk assessment by the criteria for marine sediment quality of Quebec, Canada suggested that there have been some ecological risk in the intertidal zone of Bohal Bay based on PAHs concentration in the surface sediment samples.