南大港湿地表层沉积物中多环芳烃污染特征及潜在生态风险评价

随沿海经济发展及人类开发加剧，滨海湿地受到多环芳烃等污染侵害，值得重视。对南大港湿地19个站点表层沉积物中多环芳烃（PAHs）的含量及其分布特征进行研究，并对其来源和潜在风险进行解析与评价。研究表明，该地区表层沉积物中16种PAHs总含量为7.12～156.10 ng/g（均值63.03 ng/g），与全球空间范围湿地污染程度类比，研究区湿地表层沉积物中PAHs整体污染水平并不高。综合特征比值法、相关性分析及主成分分析法推断出本湿地沉积物中PAHs主要来源为油类的燃烧以及油类泄露的联合作用源，与周边人类活动情况相符。采用效应区间低值法（ERL）和中值法（ERM）对PAHs进行生态风险评价，零星站位中菲、二氢苊浓度位于ERL与ERM之间，其余站点不存在潜在生态危害。南大港湿地中PAHs对湿地生态的毒副作用尚属于安全范围。该研究可为环渤海海岸带污染控制和治理提供基础数据支撑，也为保护良好的海湾滨海湿地生态环境提供科学信息。

CHARACTERISTICS OF PAHS IN SURFACE SEDIMENTS AND ECOLOGICAL RISK ASSESSMENT: A CASE FROM THE NANDAGANG WETLANDS

With the progress in coastal zone development, massive human activities become stronger, which leads to the pollution of marine wetlands. Taking the Nandagang wetlands as a case, the characteristics of 16 polycyclic aromatic hydrocarbons (PAHs) from 19 surface sediments are studied and risk assessment carried out in this research. The results show that the total concentration of 16 PAHs in surface sediments of the Nandagang wetlands ranges from 7.12 to 156.10 ng/g with a mean around 63.03 ng/g, which remains on a relatively low level in comparison with other places in the world in terms of PAHs pollution. The PAHs of the study area are mainly coming from a mixed source of petroleum leakage and oil combustion, based on the data acquired by means of selected PAHs ratios, the two-tailed Pearson correlation and principal components analysis at different sites. The ecological risk assessment revealed by the effects range-low (ERL) and the effects range-median (ERM) suggests that negative effects of the PAHs are limited in the surface sediments from the Nandagang wetlands, except for acenaphthene and fluorene in a few sites which bears potential risk to the environment. The present work may provide some basic data and scientific information for environment protection and management along the Bohai coast.