典型石油化工污染场地多环芳烃土壤指导限值的获取与风险评价

尝试利用英国的污染土地暴露评价模型(CLEA模型)获取了典型石油化工污染场地中几种多环芳烃(PAHs)的土壤指导限值(SGVs)，并用所得到的土壤指导限值对该场地的污染物风险进行了评价.结果表明，研究区域内萘、蒽、苯并［a］芘、苊、芴、芘的土壤指导限值分别为3.57×103，6.12×107，0.874，6.81×104，6.24×104和5.84×106　ng/g.特定场地表层土壤中萘、蒽、苊、芴、芘的实测浓度(MECs)大于其相应土壤指导限值的概率均趋于0，而苯并［a］芘的为0.225.这几种PAHs的风险从大到小依次为:苯并［a］芘萘>苊>芴>芘>蒽，说明该场地的优先控制污染物为苯并［a］芘. 

Deriving of Soil Guideline Values and Risk Assessment of Polycyclic Aromatic Hydrocarbons at a Typical Petrochemical-Contaminated Site

The site-specific Soil Guideline Values (SGVs) of several polycyclic aromatic hydrocarbons (PAHs) at a typical petrochemical-contaminated site were derived using the Contaminated Land Exposure Assessment (CLEA) model of the UnitedKingdom and the risks caused by PAHs contamination were assessed. The results showedthat the SGVs of naphthalene, anthracene, benzo ［a］ pyrene, acenaphthene,fluorene and pyrene were 3.57×103, 6.12×107, 0.874, 6.81×104, 6.24×104 and 5.84×106　ng/g, respectively. The measured environmental concentrations (MECs) of naphthalene, anthracene, acenaphthene, fluorene, pyrene and benzo［a］pyrene were measured and the probabilities of MECs exceeding SGVs were calculated. The probabilities of risk for the former 5 PAHs were close to zero, while 0.225 for benzo［a］pyrene. Their risks were in the following order: benzo［a］pyrenenaphthalene >acenaphthene > fluorene > pyrene > anthracene, which indicated that benzo［a］pyrene was the priority pollutant at the site.