胶州湾大沽河河口表层沉积物中多环芳烃分布特征、来源及生态风险评价

对胶州湾大沽河河口18个站点处表层沉积物中多环芳烃的含量及其分布特征进行研究，并对其来源进行解析以及潜在风险展开评价。研究表明，大沽河河口表层沉积物中所测得的16种优先控制的多环芳烃总量为21.93×10-9~634.64×10-9，平均含量为239.41×10-9，根据沉积物中PAHs污染等级划分，大沽河河口PAHs污染状况属于中度污染，且7月份PAHs含量高于10月份。所有站点中16种PAHs平均含量最高的前三位分别为芴（58.10×10-9）、荧蒽（28.71×10-9）、芘（23.69×10-9），含量最低的为苊（0.65×10-9）。同时与国内外多个海湾河口表层沉积物中多环芳烃污染状况比较，大沽河河口表层沉积物中多环芳烃污染状况处于中等水平，应引起注意。运用特征比值法及主成分分析法对研究区多环芳烃来源进行解析，显示大沽河河口表层沉积物中多环芳烃来源主要为机动车尾气排放及化石燃料等燃烧而产生的石油燃烧源及原油等直接泄漏导致的石油源。采用效应区间低、中值法（ERL/ERM）对大沽河河口表层沉积物中的多环芳烃进行生态风险评价，仅个别站点芴含量超出效应区间低值（ERL），其余站点PAHs含量均在ERL值以下，对生态环境潜在负面效应很小。根据苯并（a）芘的等效致癌毒性（BEQ）评价发现大沽河河口表层沉积物中PAHs对人体健康不存在威胁。

Distribution,sources and ecological risk assessment of PAHs in surface sediments from the Dagu River estuary in Jiaozhou bay,China

The distribution, sources and risk assessment of 16 polycyclic aromatic hydrocarbons (PAHs) in surface sediments from the Dagu River estuary in Jiaozhou bay, China, have been investigated in the research. The results indicated that the total concentrations of 16 PAHs in surface sediments of the Dagu River estuary ranged from 21.93×10-9 to 634.64×10-9 with a mean value of 239.41×10-9, which was of the moderate level of PAHs pollution and relatively low in comparison with other estuaries and bays around the world. The concentration of PAHs in the surface sediments from the Dagu River estuary in July was much higher than in October, and Fluorene, Fluoranthene, Pyrene had the highest mean values of 58.10×10-9, 28.71×10-9, 23.69×10-9, but Acenaphthylene was with the lowest value of 0.65×10-9. The PAHs in the study area were mainly originated from petroleum combustion. Besides, the PAH may be contaminated by petroleum as indicated by the selected ratios of PAHs and principal components analysis at different sites. The result of the ecological risk assessment shows little negative effect for most individual PAHs in surface sediments of the Dagu River estuary in Jiaozhou bay. And the risk assessment of PAHs for human was determined by the BEQ of Benzo (a) pyrene, which suggested that the toxicity of PAHs have little potential risk for people's health.