黄河沉积物中多环芳烃的分布特征及来源分析

根据黄河干流和支流沉积物中多环芳烃(PAHs)的含量,分析了PAHs分布特征.结果表明,黄河支流沉积物中PAHs污染明显大于干流,其顺序为依洛河>汾河>蟒河.PAHs的种类与芳环数分布情况表明,黄河支流中的PAHs主要来源于石油烃类污染,依洛河也存在部分矿石燃料煤不完全燃烧的热解成因.沉积物有机污染物风险评价的结果表明,3条支流处于高生态风险区,对该地区的生物具有较大的不利影响. 

Distribution and Origin of Polycyclic Aromatic Hydrocarbons (PAHs) in Sediment from the Yellow River

Based on PAHs contents in the sediments of the main stream and tributaries of the Yellow River, the distribution characteristics of PAHs were analyzed. The results show that the contents of PAHs are higher in sediments of tributaries than that of main stream of the river, with the order of the Yiluo River > the Fen River > the Mang River. According to the varieties and aromatic rings distributions of PAHs, petroleum-derived contamination may be the dominant source in the tributaries of the Yellow River while some PAHs in the Yiluo River may be derived from pyrolytic source. The risk assessment values for organic pollutants in the sediments show that the three tributaries are at high ecological risk region, which might exert significant potential damage to the organisms in the region.