长江口潮滩表层沉积物中多环芳烃分布特征

 长江口滨岸潮滩14个表层沉积物中多环芳烃(PAHs)分析表明,PAHs总量分布范围在0.263~6.372mg/kg.多环芳烃含量随取样位置发生明显的变化,主要特征是在近排污口处含量最大,而远离排污口含量趋于降低.依据荧蒽/芘之比以及2+3环与4环以上PAHs化合物分布特点,表明长江口近岸潮滩沉积物中PAHs主要来自石油类污染物的输入.通过与国内外河口潮滩沉积物中PAHs含量的对比,研究区处于低-中等水平,但已有个别PAHs化合物(如蒽、芴)超过基于生物毒性试验的沉积物质量标准,对潮滩生态将构成一定的潜在危害.

Distribution characteristics of polycyclic aromatic hydrocarbons (PAHs) in surface sediments of tidal flats of the Yangtze Estuary

The analysis of PAHs in 14 surface sediments of tidal flats of the Yangtze Estuary showed that total PAHs concentration ranged from 0.263 to 6.372mg/kg. The contents of total PAHs varied dramatically with the sampling region. They are characterized by greatest content near sewage discharge point with trend to decrease by increasing distance. Petroleum-derived contamination may be dominant source in the study area, depending on the distributions of fluoranthene/pyrene and 2 3 ringed and 4 ringed PAHs compounds in surface sediments. The degree of sediment contamination by PAHs in study area is moderate/low in comparison with other internal and external estuarine and tidal flat surface sediments. However, anthracene and fluorene exceed the effects range low (ER-L) values, which might certain potential damage to the Yangtze tidal flat ecosystem.