上海某停车场表层土壤中多环芳烃的污染特征及健康风险评价研究

Characteristics and Health Risk Assessment of PAHs Pollution in Topsoil of A Parking Lot in Shanghai

采集上海某停车场16个表层土壤(0 cm^20 cm)样品,采用气相色谱-质谱联用仪(GC-MS)分析土壤中(GB 36600-2018)基本项规定的8种PAHs的含量。结果表明,16个土壤样品中S3和S9点位土壤污染超标,8种PAHs总含量分别为18810 ng/g和9280 ng/g,处于重度污染水平,超标污染物为苯并(a)芘和二苯并(a,h)蒽,在居住条件下的致癌风险超过10-6,非致癌风险超过1,已对人群健康产生危害,需实施土壤修复工程。

Eight PAHs specified in GB 36600-2018 basic items were analyzed by GC-MS in 16 surface soil(0~20 cm)samples collected from a parking lot in Shanghai.The results showed that the concentrations of∑8PAHs in the sampling site S3 and S9 were 18810 ng/g and 9280 ng/g respectively,which were in the level of severe pollution.The pollutants exceeding the standard were benzo(a)pyrene(BaP)and dibenzo(a,h)anthracene(DBA).The health risk assessment showed that the carcinogenic risks of benzo(a)pyrene(BaP),dibenz(a,h)anthracene(DBA)exceeded the threshold of 1×10-6 and the non-carcinogenic risk of benzo(a)pyrene(BaP)exceeded the threshold of 1 under residential land condition.The soil PAHs in the parking lot already caused harm to human health and the soil restoration project must be carried out.