论文部分内容阅读
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。
The contents and distribution characteristics of polycyclic aromatic hydrocarbons (PAHs) in surface sediments at 18 sites in the Dagu River Estuary of Jiaozhou Bay were studied, and their sources were analyzed and their potential risks were evaluated. The results show that the total amount of 16 priority PAHs measured in the surface sediments of Dagu River Estuary is 21.93 × 10-9 ~ 634.64 × 10-9 with the average content of 239.41 × 10-9. According to the sediment In PAHs pollution level division, Dagu River mouth PAHs pollution is moderate pollution, and in July PAHs content higher than in October. The top three of the 16 PAHs in all the sites were fluorene (58.10 × 10-9), fluoranthene (28.71 × 10-9), and pyrene (23.69 × 10-9), respectively, with the lowest contents being 苊 (0.65 × 10-9). At the same time, compared with the pollution status of polycyclic aromatic hydrocarbons (PAHs) in surface sediments of several estuarine estuarines both at home and abroad, the PAHs pollution in the surface sediments of Daguhe estuary is at a medium level and should be paid attention to. Analyzed the sources of polycyclic aromatic hydrocarbons (PAHs) in the study area by using characteristic ratio method and principal component analysis, which showed that the sources of polycyclic aromatic hydrocarbons (PAHs) in the surface sediments of Daguhe estuary are mainly the sources of petroleum combustion caused by vehicle exhaust and fossil fuel combustion, etc. Direct leakage of crude oil and other sources of oil. The ecological risk assessment of polycyclic aromatic hydrocarbons (PAHs) in the surface sediments of Dagu River Estuary was carried out by using ERL / ERM method. Only the fluorene content of individual sites exceeded the low ERL, and the contents of PAHs in other sites Below the ERL value, the potential negative effect on the ecological environment is small. Based on the equivalent carcinogenic toxicity (BEQ) of benzo (a) pyrene, it was found that PAHs in surface sediments of Daguhe estuary did not pose a threat to human health.