沈阳细河水中多环芳烃的分布、来源及生态风险评价

Polycyclic aromatic hydrocarbons in Xihe River,Shenyang:Seasonal variation,sources,and ecological risk assessment

通过测定不同季节细河水中多环芳烃(PAHs)的含量,研究了细河水中PAHs的分布,探讨了PAHs的来源,评价了其生态风险。细河水中6月(夏季)16种PAHs的含量为0.214～0.857μg·L-1,平均为0.562μg·L-1;9月(秋季)水中PAHs含量为0.195～0.633μg·L-1,平均0.380μg·L-1;11月(冬季)水中PAHs含量为0.122～0.486μg.L-1,平均含量为0.236μg·L-1。苯并(a)芘含量明显高于国家地表水环境质量标准(GB3838-2002);对细河水中PAHs污染来源分析发现,6月和9月PAHs的主要来源为石油污染和石油及其精炼产品的燃烧;通过商值法对细河的初步风险评价表明,细河水中苯并(a)芘存在较大的生态风险,应引起关注。

Through the determination of the concentrations of polycyclic aromatic hydrocarbons （PAHs） in Xihe River in different seasons,this paper analyzed the temporal variation of PAHs,their sources,and possible ecological risk. In the water body of Xihe River,the concentrations of 16 PAHs ranged in 0.214-0.857 μg·L^-1averaged 0.562 μg·L^-1in June （summer）,0.195-0.633 μg·L^-1averaged 0.380 μg·L^-1in September （autumn）,and 0.122-0.486 μg·L^-1averaged 0.236 μg·L^-1in November （winter）,with that of benzo[a]pyren much higher than the guidance value provided by the environmental quality standards for surface water （GB 3838-2002）. In June and September,the PAHs in Xihe River mostly came from oil,oil burning residue,and oil refined process. The preliminary assessment with quotient method showed that the benzo[a]pyren in the river had great ecological risk,which should be paid more attention.