成都市文娱区表层土壤重金属健康风险评价

为研究成都人口密集的文娱区表层土壤的重金属污染情况以及重金属人体健康风险，采集并分析了川大望江校区、八宝广场、沙河驷马桥段、人民公园和春熙路30个表层土样中Cd、Zn、Cu和Pb元素的含量，并通过内梅罗综合污染指数法和健康风险评价法对重金属污染水平及人体健康风险进行了评价。结果发现，与土壤背景值相比重金属Pb的浓度较高（高出背景值的1~2倍）；综合指数显示除人民公园表土重金属达到中度污染外，其余各区处于轻度污染。在健康风险方面，文娱区表层土中这四种重金属尚不能对人体造成非致癌健康风险；但无论儿童还是成人，由Cd可导致的致癌风险已不能忽视。因此，应将Cd作为成都市土壤重金属污染防控工作中优先控制的重金属。

Health Risk Assessment of Topsoil Heavy Metals in Entertainment Areas of Chengdu

In order to understand the heavy metal pollution status and the corresponding human health risk of topsoil from the populated entertainment areas in Chengdu, 30 topsoil samples from the Wangjiang campus of Sichuan university, the Eight-treasure square, the Shahe sima plot, the people''s Park and the Chunxi Road were investigated and contents of Cd, Zn, Cu and Pb in their topsoil were analyzed. The Nemerrow comprehensive pollution index method and the health risk assessment model were applied to evaluate the heavy metal pollution status and human health risk, respectively. The results showed that, comparing with the soil background value, Pb contents were relatively high (1-2 times higher than the background value) and the heavy metal pollutions were very slight in all selected entertainment areas except the people''s Park whose topsoil showed a moderately pollution status. In the aspect of human health, the heavy metals contents in all topsoil samples from entertainment areas showed no non-carcinogenic risk for human, however, the carcinogenic risk brought by Cd is becoming a concern for both adults and children. Therefore, we suggested Cd as the priority in preventing and controlling of heavy metal pollution in soil of Chengdu.