中文摘要：

为揭示人群暴露地表灰尘中PAHs的健康风险,在西安市采集58个地表灰尘样品,分析其中16种优控PAHs质量分数,并根据美国能源部风险评估信息系统中的暴露方法对其健康风险进行评价.结果表明：西安市地表灰尘中w（∑16PAHs）（16种PAHs总量）范围为5.04-47.74mg/kg,平均值为13.85mg/kg.人群暴露地表灰尘中PAHs的主要途径是经口摄入,并且不同途径下儿童的暴露剂量均高于成人.地表灰尘中PAHs对人群没有明显的非致癌健康危害,但对儿童的非致癌危害高于成人,其中Nap、Phe、Fla、Pyr和BghiP对人群的非致癌风险明显高于Acy、Ace、Flu和Ant.7种致癌PAHs的致癌风险大小顺序为BaP〉DBA〉BbF〉InP〉BaA〉BkF〉Chy,致癌风险总和为2.51×10-5,其中BaA、BbF、BaP、InP和DBA致癌风险在1.07×10-6-9.56×10-6之间.研究显示,西安市地表灰尘中16种PAHs对人群的健康危害相对较低.

英文摘要：

A total of 58 surface dust samples collected from Xi＇ an City were analyzed for the concentrations and health risks of 16 priority polycyclic aromatic hydrocarbons（ PAHs）. The results showed that the sum of 16 PAHs（ ∑16PAHs） in the surface dust ranged from 5. 04 mg/kg to 47. 74 mg/kg,with a mean of 13. 85 mg/kg. The main pathway of human exposure to PAHs in surface dust was ingestion through the mouth. The exposure dose of children through different exposure pathways was higher than that of adults. The noncancer risk of human exposure to PAHs in surface dust was not significant,while the non-cancer risk for children was higher than that of adults. Meanwhile,the human non-cancer risks of Nap,Phe,Fla,Pyr and Bghi P were significantly higher than those of Acy,Ace,Flu and Ant. The cancer risks of 7 carcinogenic PAHs in surface dust decreased in the order of BaP〉 DBA 〉BbF 〉InP 〉BaA〉 BkF〉 Chy. The sum of cancer risk of 7 carcinogenic PAHs was 2. 51 × 10- 5,while the cancer risks of BaA,BbF,BaP,InP and DBA were in the range of1. 07 × 10^-6to 9. 56 × 10^-6. The study showed that the 16 PAHs in surface dust in Xi＇ an City presented low health risk to the population.