城市老工业搬迁区河道PAHs分布特征及其生态风险——以沈阳市卫工河为例

为查明城市老工业搬迁区景观河道中多环芳烃(polycyclic aromatic hydrocarbons,PAHs)的分布特征并评估其生态风险,于2011年10月至2012年9月期间,以沈阳市卫工河为研究对象,调查了河水和底泥中16种国家环保部优先控制的PAHs环境滞留情况.通过季节性采样和沿河采样,初步查明了PAHs的时空分布特征,用熵值法初步评价了PAHs滞留的生态风险.结果表明:卫工河水中PAHs的平均质量浓度为0.721μg·L-1,底泥中PAHs平均质量分数为3 777.8 ng·g-1.河水与底泥中PAHs含量与溶解态有机碳含量均呈正相关关系.熵值法分析结果表明,卫工河PAHs滞留存在中度偏低水平的生态风险,但在某些样点区,底泥中萘和蒽的生态风险值较高.

Distribution Characteristics and Ecological Risk of PAHs in River Courses of Urban Old Industrial Relocation Areas:A Case Study of Weigong River in Shenyang City

Aimed at the distribution characteristics and ecological risk of polycyclic aromatic hydrocarbons (PAHs) in the river of an urban relocation area， the 16 priority PAHs by the Chinese Ministry of Environmental Protection were quantitatively analyzed in the water and sediment of Weigong River of Shenyang City， China from October 2011 to September 2012. The spatial distributions of PAHs were revealed by seasonal sampling and along-the-river sampling， and the ecological risk of PAHs was preliminarily assessed with entropy evaluation. The results showed that the mean concentrations of total PAHs were 0.721μg·L^-1 in the water and 3777.8ng·g^-1 in the sediment. A positive correlation was found between the concentrations of TOC (total organic carbon) and PAHs in both water and sediment. As a whole， the potential risk of PAHs pollution in Weigong River could be categorized as low to moderate. However， naphthalene and anthracene might cause toxicity to the aquatic organisms at some sampling sites.