黄河口两岸土壤中多环芳烃分布及其生态风险

Distribution and Ecological Risk Assessment of Polycyclic Aromatic Hydrocarbons in Soils on both Sides of the Yellow River Estuary

以黄河三角洲国家级自然保护区内黄河口黄河南北两岸荒地土壤为研究对象,分析其多环芳烃(PAHs)含量、组分、污染水平及生态风险。结果表明,黄河口黄河两岸采集7个样点的表层土壤中PAHs含量均值为122.96 ng/g,属于中等污染水平。黄河口北岸土壤中PAHs含量均值低于南岸土壤中PAHs含量,黄河口北岸土壤中PAHs属于低污染水平,而南岸土壤中PAHs属于中等污染。黄河口两岸7个样点中土壤中均含有Nap,且Nap占ΣPAH16含量的90.56%,土壤中PAHs组成以2环为主。根据PAHs自身结构性质分析黄河口两岸样地土壤中PAHs污染来源以原油泄漏或化石燃料自然挥发为主。综合平均效应区间中值商法(m-ERM-Q)和毒性当量因子评价法(TEQ)分析,黄河三角洲国家级自然保护区内黄河口两岸7个样点表层土壤中PAHs的生态风险较低。

In this study,the contamination level,component and ecological risk assessment of polycyclic aromatic hydrocarbons(PAHs)of soils on both sides of the Yellow River estuary was analyzed in the Yellow River Delta national Nature Reserve.The results show that the mean of PAH concentrations of soil was 122.96 ng/g in the 7 sample sites,belong to medium pollution level.The average concentration of PAHs in soil of the north bank of the Yellow River Estuary was lower than that in the south bank,but the difference was not significant.The PAHs in the soil of the north bank of the Yellow River Estuary was low pollution level,while the PAHs in the soil of the south bank was medium pollution level.Nap was all found in 7 soil samples from both sides of the Yellow River estuary,and its content accounted for 90.56% of ΣPAH16 content.The composition of PAHs in soil was mainly 2-ring.According to the analysis of the structure and properties of PAHs,the main pollution sources of PAHs in the soil of the Yellow River estuary were crude oil leakage or natural volatilization of fossil fuels.Based on the m-ERM-Q and TEQ analysis,the ecological risk of PAHs in the 7 sample sites in the Yellow River Estuary was relatively low.