青岛城市公园灰尘重金属的形态分布及健康风险评价

对青岛市南、市北、四方和李沧四区的公园灰尘样品的重金属全量和形态分布进行分析，并对公园灰尘重金属的污染状况进行了健康风险评价。结果表明：青岛城市公园土壤和灰尘均在不同程度上受到Cu、Zn、Pb、cd的污染，李沧区4种重金属含量均在四区最高。市南区公园灰尘中的Cu、Pb、cd的含量最低，市北区的Zn含量最低；Cu主要以有...

Chemical Speciation of Heavy Metals and Health Risk Assessment in Dust of Qingdao Urban Parks

The total amount of heavy metals and their distributions of chemical speciation were analysed in the dust samples from different parks of the four districts in Qingdao, including Shinan, Shibei, Sifang and Licang Districts, and the health risk of heavy metals in dust in these parks was evaluated. The result showed that soil and dust in the urban parks in Qingdao City were all polluted in different extents by four kinds of heavy metals： Cu, Zn, Pb and Cd. And the content of Cu in Licang District was in the top among the four districts, as well as Zn, Pb, and Cd . The content of Cu in the dust of the parks in Shinan District was the lowest, as well as Pb and Cd. The content of Zn in Shibci District was the lowest. Cu mainly existed as the organic phase, while Zn mainly existed as carbonates and Fe-Mn oxides, Pb Fe-Mn oxides, Cd Fe-Mn oxides and residual fraction. The order of non-cancer hazard indexes of these four heavy metals was Pb 〉 Cu 〉 Cd 〉 Zn. Their indexes were all lower than their threshold values, which involved no non-carcinogenic risk to the human health. And Cd involved no carcinogenic risk to humans.