中文摘要：

以上海市区地表灰尘和降雨径流中汞砷为研究对象,探讨其环境效应.研究地表灰尘中汞砷粒径效应.结果表明：3个不同类型采样点中,汞砷高值都集中在小于125μm范围内,基本显示出粒径效应.对屋面和交通干道降雨径流中的汞砷含量进行分析,除交通干道径流的汞之外,屋面径流和交通干道径流汞砷浓度都随着降雨历时有衰减的趋势,并且地表灰尘对降雨径流污染负荷贡献较大.两者汞的EMC分别为0.000 70mg/L和0.000 51mg/L,符合国家Ⅳ类地表水标准,而砷的EMC分别为0.000 14mg/L和0.001 48mg/L,符合国家Ⅰ类标准.汞砷基本都发生了初期冲刷效应且程度较大,初步推测降雨量和冲刷面类型是影响初期冲刷效应的重要因素.

英文摘要：

This study was about undertaken to assess the impact of Hg and As on the surface environment system in Shanghai urban district. Particle size effect of Hg and As in surface dust was researched, and the result showed that the high values centralized in the range of 〈125 um and particle size effect played a role in pollutant concentrations. The contents of contaminants decreased with the increasing of flow time except for Hg of highway. The consequence of environmental behavior of Hg and As in multi-media environment of surface dust and rainfall-runoff system proved that surface dust made a great contribution on the load in rain-fall runoff. The EMCs of Hg in roofing and highway were similar, but EMCs of As were opposite to them. The result indicated that the magnitude of the first flush phenomenon which was affected by characterization of rainfall and different land use types was found to be greater which was closely linked with precipitation.