不同源区大气降尘的磁学性质及其环境意义  

Magnetic properties of atmospheric dustfall from different source region and its environmental significance

作　　者：李勇 邹长明[2] 姚洁[1] 

机构地区：[1]安徽科技学院电气与电子工程学院,安徽凤阳233100 [2]安徽科技学院资源与环境学院,安徽凤阳233100

出　　处：《华东师范大学学报（自然科学版）》2016年第4期158-168,共11页Journal of East China Normal University(Natural Science)

摘　　要：为了研究大气降尘磁学性质对污染物来源的指示作用,对水泥厂、石英砂厂和县城等不同源区大气降尘的磁学参数、矿物成分、微观形貌和粒度特征进行了测量,结果表明降尘都以地方性物质为主,石英砂厂降尘大部分是粒状单矿物,粒度较粗,棱角分明,主要成分是石英;水泥厂降尘呈片状和不规则粒状集合体,主要矿物成分是硅酸盐和碳酸盐;县城降尘呈粒状和絮状,成分比较复杂,主要元素有:Si、Al、Na、Ca、Fe等.降尘中磁性矿物含量随着季节变化,冬季高于其他季节;不同源区降尘中磁性矿物含量存在差异,县城降尘最高,其磁学参数对污染物来源具有良好的指示作用.水泥厂和石英砂厂大气污染严重,每月降尘量的平均值远高于县城,但这2类工业降尘中磁性矿物含量比县城低,且磁学特征相似,需结合其矿物成分、微观形貌和粒度特征进行区分,建立降尘与污染源之间的联系.In order to study the indication effect of magnetic properties of atmospheric dustfall on the pollution source, magnetic parameters, mineral composition, morphology and particle size were measured on atmospheric dustfall from different source region of cement factory, quartz sand factory and county seat. Results showed that dustfall mainly came from the local matter, the dustfall of quartz sand factory was monomineral with morphology of granular structure, its main component was quartz with coarse grain size and angular shape. The dustfall of cement factory was sheet and irregularly granular aggregation, its principal constituents were silicates and carbonates. The dustfall of county seat was granular and flocculent, the component was complex, whose main elements were Si、Al、Na、Ca、Fe and so on. The magnetic mineral content of dustfall changed withseasons, it was higher in winter. The magnetic mineral content of dustfall from different source region was not the same, the dustfall of county seat was the highest, its magnetic parameters can be a good indicator of pollution sources. The atmosphere pollution of quartz sand factory and cement factory was serious, their average values of monthly dustfall were far higher than county seat, but the magnetic mineral content of these two kinds of industrial dustfall was lower than county seat, and their magnetic characteristics was similar. We must combine with their mineral composition, morphology and particle size to distinguish, then set up connection.

关 键 词：不同源区 大气降尘 磁学性质 环境意义 

分 类 号：P318[天文地球—固体地球物理学]