山东省东营市农田土壤PAHs污染特征及风险评估

Pollution characteristics and health risk assessment of polycyclicaromatic hydrocarbons in agricultural soils in Dongying City, Shandong Province

以山东省东营市80个表层农田土样为研究对象,研究16种多环芳烃(PAHs)含量、来源、空间分布特征及致癌、非致癌健康风险。结果表明,PAHs总质量浓度为4.25～119.94 mg·kg^(-1),平均值36.08 mg·kg^(-1),高于国内、京津冀地区和西欧暴露风险评价水平,表层土壤PAHs含量处于较高水平。克里金空间插值结果显示,PAHs空间分布呈"南高北低"分布特征,高污染区域主要集中于南部东营区和垦利区;特征比值法源解析揭示,石油开采、加工、输送、利用、泄露及化石燃料燃烧是东营市南部表层土壤PAHs主要来源;PAHs致癌风险水平在1.12×10^(-8)～1.33×10^(-5),整体处于潜在致癌风险和高致癌风险水平之间,其中苯并[a]芘(BaP)致癌风险最高,贡献率达80%以上。非致癌风险低于可接受非致癌危害指数,非致癌风险不明显。克里金空间插值结果表明,高致癌风险集中分布于利津县、广饶县、垦利区及东营区,建议加强该地区表层土壤有机污染防治。

To determine the concentration,spatial distribution,and health risk of 16 polycyclic aromatic hydrocarbons(PAHs)in Dongying City,a total of 40 surface farmland soil sample were collected.The results showed that the total concentrations of PAHs ranged from 4.25 to119.94 mg·kg^-1,the average concentration was 36.08 mg·kg^-1,which was higher than the average concentrations of other soils reported in China and Western Eurpean Exposure Risk.Kriging interpolation map showed the spatial distribution of PAHs presents the distribution characteristics of high sough and low north.The high contaminated areas were located in Dongying district and Kenli district.The characteristic ratio method revealed that oil drilling,processing,transport,use,leaks and fossil fuels were the main sources of the PAHs in the south of the city.The cancer risk of PAHs ranged from 1.12×10^-8 to 1.33×10^-5,and at the level of potential and high carcinogenic risk.Among the 16 PAHs,the highest health risk for carcinogenic PAHs was Bap.Non-carcinogenic risk lower than the baseline value of acceptable risk(1.0),the potential risk was not obvious.Kriging interpolation map showed the high carcinogenic risk was concentrated in Lijin County,Guangrao County,Kenli and Dongying districts.Suggest strengthening prevention and control of surface soil organic pollution in the region.