化工园区及周边农田土壤多环芳烃污染特征、来源及风险评价OACSTPCD

In order to study the pollution status of polycyclic aromatic hydrocarbons(PAHs)in the farmland soil around a chemical industry park,the pollution level and distribution characteristics of PAHs in the farmland soil inside and around a typical chemical industry park were analyzed in Zibo.The sources of PAHs were analyzed by using the high-low molecular ratio method and principal component analysis method,and the ecological risk was assessed based on the toxic equivalent quantity(TEQ)method.The results showed that the total concentrations of 16 PAHs(∑16PAHs)ranged from 74.4～545.5 μg/kg,with the mean value of 221.2 μg/kg.The degree of PAHs pollution in the sampling area from high to low was as follows:soil surrounding large chemical enterprises＞soil inside the park＞soil around the park(＜1000 m)＞soil around the park(1000～2000 m)＞soil in the control area.The research areas were dominated by high molecular PAHs(4～6 rings),and the farther away from the pollution source,the lower the proportion of high molecular PAHs.The source analysis showed that the PAHs in the farmland soil in the research areas were mixed sources,mainly from coal burning,followed by volatilization of oil and traffic emissions.The risk assessment results showed that there were low potential carcinogenic risks of PAHs in the research areas,and the seven carcinogenic PAHs were the main contributors to the carcinogenic risk,with the highest contribution of dibenzo(a,h)anthracene and followed by benzo(a)pyrene.