Abstract: X⁃ray fluorescence spectroscopy was used to explore the spatial distribution characteristics and potential ecological risks of heavy metals (Cu, Pb, V, Zn, Cr, Mn) in street dust in different functional areas of the city.The heavy metal content in the dust samples of the cultural and educational districts, commercial districts, residential areas, industrial areas, traffic areas and mixed areas in Benxi City was analyzed,and the results show that the average contents of heavy metals in street dust samples are 3.4, 3.1, 0.9, 5.5, 2.0 and 1.0 times of the Benxi Soil Element Background Values, respectively. The spatial distribution of heavy metal elements was that Cu, V and Cr were highest in the cultural and educational districts, Pb, Zn and Mn were highest in the industrial districts, Cu, Pb and Zn were lowest in the mixed districts, Cr and Mn were lowest in the commercial districts, and V was lowest in the residential districts. The environment risk of heavy metal pollution in street dust of Benxi city was assessed by Potential Ecologically Risk Index .The assessment results show that V, Cr and Mn are low potential ecological hazards, Zn is a medium potential ecological hazard, Cu and Pb have reached heavy potential ecological hazards.

Key words: Street dust, Heavy metals, Potential ecological hazard index method, Benxi city

摘要： 采用X射线荧光光谱法探究了城市不同功能区街道灰尘重金属（Cu、Pb、V、Zn、Cr、Mn）空间分布特征与潜在生态风险。对本溪市文教区、商业区、居民区、工业区、交通区和混合区街道灰尘样品中的重金属含量进行了分析。结果表明，街道灰尘中重金属Cu、Pb、V、Zn、Cr、Mn平均质量分数分别为本溪市土壤环境背景值的3.4、3.1、0.9、5.5、2.0、1.0倍；Cu、V、Cr在文教区质量分数最高，Cr、Mn在商业区质量分数最低，V在居民区质量分数最低，Pb、Zn、Mn在工业区质量分数最高，Cu、Pb、Zn在混合区质量分数最低。应用潜在生态危害指数法评价的结果表明，本溪市街道灰尘中的重金属达到重污染水平，具有严重的潜在生态危害，其中，V、Cr、Mn属于低潜在生态危害，Zn属于中等潜在生态危害，Cu、Pb达到了重潜在生态危害。

关键词: 街道灰尘, 　重金属, 　潜在生态危害指数法, 　本溪市