石化工业区周边土壤中多环芳烃的组成及分布特征分析

Analysis of composition and distribution characteristics of polycyclic aromatic hydrocarbons in surrounding soil of petrochemical industrial area

采集某石化工业区周边20个表层土壤样品,分析了其中16种优控多环芳烃（PAHs）的含量与分布特征,并对其污染水平及来源进行了解析。结果表明,各采样点土样中16种PAHs的总质量浓度在268.16~3 304.60μg/kg,平均为1 032.24μg/kg,除芴、苊外,其余14种PAHs在各采样点土样中均有不同程度的检出,该研究区周边土壤已经普遍受到PAHs的影响,且污染程度主要集中在中重度污染;总的来看,各采样点PAHs的组成结构规律基本一致,所占比例以4环为主,5~6环居中,2~3环较低;根据PAHs特征比值法判断,该石化工业区周边土壤中PAHs污染主要来源于煤等生物质的高温燃烧,小部分地区受到石油燃烧源输入的影响,而机动车尾气排放也可能是PAHs的来源之一。

Twenty topsoil samples were collected from surrounding soil of a petrochemical industrial area. And the concentrations,distributions,pollution levels and sources of 16 US-EPA priority polycyclic aromatic hydrocarbons （PAils） were analyzed. The results showed that the concentrations of 16 kinds of PAHs were from 268.16 μg/kg to 3 304.60μg/kg. And the average concentration was 1 032.24μg/kg. Except fluorene,acenaphthene,the other 14 kinds of PAHs were detected in varying degrees. The surrounding soil of the petrochemical industrial area had generally af- fected by the PAHs. The degree of pollution was mainly concentrated in the heavy pollution. Overall,composition and structure of PAHs in each sampling point were almost the same. The value of PAHs isomer ratios suggested that the source of PAHs in the surrounding soil were mainly from high temperature combustion of coal and biomass,and some sites were impacted by oil combustion. Vehicle exhaust emissions might be one sources of PAHs at the same time.