Abstract：
As a systematic research at basin scale, this study investigated the spatial distribution, source apportionment and ecological risks of eighteen polycyclic aromatic hydrocarbons (PAHs) in surface sediments at different functional regions (rivers, lakes and reservoirs) from Taihu basin. Results showed that the mean values of 18 PAHs (defined as ∑18PAHs) in river sediments (1277 ng/g) was much higher than those observed in lake sediments (243 ng/g) and reservoir sediments (134 ng/g). The accumulation of PAHs in river sediments was largely impacted by the local social-economic development and energy consumption. The positive matrix factorization (PMF) and isomer ratios analysis of PAHs suggest that relative contributions to PAHs in sediments were 15% for gasoline and heavy oil combustion, 9% for oil spills, 30% for coal combustion, 23% for traffic source, and 23% for diagenetic source. Ecological risk assessment based upon risk quotient (RQ) method indicated that sediments at Taihu basin have suffered moderate risk of PAHs.
摘要：
作为流域尺度的系统研究，这项研究调查了空间分布，不同功能区表层沉积物中18种多环芳烃（PAHs）的来源解析和生态风险（河流，湖泊和水库）来自太湖流域。结果表明，河流沉积物中18PAHs（定义为∑18PAHs）的平均值（1277ng/g）远高于湖泊沉积物（243ng/g）和水库沉积物（134ng/g）。河流沉积物中多环芳烃的积累在很大程度上受到当地社会经济发展和能源消耗的影响。PAHs的正矩阵分解（PMF）和异构体比率分析表明，汽油和重油燃烧对沉积物中PAHs的相对贡献为15％，9％的石油泄漏，30%用于煤燃烧，23%为交通来源，成岩来源为23%。基于风险商（RQ）方法的生态风险评估表明，太湖流域沉积物遭受了中等程度的PAHs风险。
