上海市区地表灰尘对降雨径流中汞砷污染的影响

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...

Assessment on the effect of surface dust on mercury and arsenic in rainfall-runoff in the Shanghai urban district

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 μm 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.