武汉市道路尘埃污染中磁学指标与重金属含量对比

发布时间：2018-05-09 21:30

本文选题：环境磁学 + 重金属分析　；参考：《中国环境科学》2017年03期

【摘要】：对武汉市不同功能区的道路尘埃进行环境磁学和化学分析的综合研究.结果显示:尘埃中的磁性矿物含量在空间分布上具有较大的差异,平均磁化率为工业区(7.36×10~(-6)m~3/kg)交通沿线(5.38×10~(-6)m~3/kg)商业区(3.76×10~(-6)m~3/kg)开发区(2.26×10~(-6)m~3/kg)和风景区(2.48×10~(-6)m~3/kg).工业活动和交通因素是造成区域尘埃中磁性矿物含量升高的主要原因,地理位置和人口密度对尘埃中磁性矿物的含量也有一定的影响.岩石磁学研究结果表明:尘埃中的磁性载体以亚铁磁性矿物为主,部分样品中含有不完整反铁磁性矿物.扫描电镜和能谱分析显示:人类活动产生的磁性颗粒(铁的氧化物和铁的硅铝酸盐)一般呈球形,自然成土过程中形成的不规则状磁性颗粒(磁赤铁矿).污染负荷指数与磁化率(R~2=0.870)、饱和等温剩磁(R~2=0.665)等表征磁性矿物含量的参数呈显著正相关.因此,尘埃的磁学参数可以作为重金属含量的参考指标.
[Abstract]:The environmental magnetics and chemical analysis of road dust in different functional areas of Wuhan City were studied. The results show that the content of magnetic minerals in dust varies greatly in spatial distribution, and the average magnetic susceptibility is 7.36 脳 10 ~ (-6) m ~ (-1) ~ (3 / kg) in industrial area.) the average magnetic susceptibility is 5.38 脳 10 ~ (-6) m ~ (-1) ~ (3 / kg) ~ (3 / kg) along the traffic) in a commercial area (3.76 脳 10 ~ (-6) m ~ (-1) ~ (3 / kg) and 2.26 脳 10 ~ (10) ~ (-6) m ~ (-1 / kg) in the development zone and 2.48 脳 10 ~ (-6) m ~ (-1) ~ (3 路kg) ~ (-1) in the scenic area. Industrial activities and traffic factors are the main reasons for the increase of magnetic mineral content in regional dust. Geographical location and population density also affect the content of magnetic minerals in dust. The results of rock magnetic study show that the magnetic carrier in dust is mainly ferromagnetic minerals, and some samples contain incomplete antiferromagnetic minerals. Scanning electron microscopy (SEM) and energy dispersive spectrum (EDS) analysis show that the magnetic particles produced by human activities (iron oxide and iron silicate) are generally spherical and irregular magnetic particles (maghematite) formed during the natural soil-forming process. There was a significant positive correlation between the pollution load index and the parameters such as magnetic susceptibility (R ~ (2)) ~ (2 +) ~ (0.870) and saturation isothermal remanent magnetic (~ (2)) ~ (0.665)) which indicated the content of magnetic minerals. Therefore, the magnetic parameters of dust can be used as a reference index of heavy metal content.
【作者单位】：中国科学院地质与地球物理研究所;中国科学院大学;中国地质大学地球物理与空间信息学院;
【基金】：国家自然科学基金项目(41572153) 湖北省科技支撑计划资助项目(2015BCE077)
【分类号】：X513

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