城市道路灰尘磁学参数的环境污染指示意义  

The environmental implications of street dust magnetic properties

作　　者：强小科[1] 李鹏[1,2,3] 徐新文[1,2] 李续彬[1,2] 孙玉芳[1,2] 赵辉[1,2] 

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710075 [2]中国科学院研究生院,北京100049 [3]黑龙江省水文地质工程地质勘察院,哈尔滨150030

出　　处：《地球环境学报》2010年第2期139-149,共11页Journal of Earth Environment

基　　金：中国科学院"西部之光"人才计划(2006ZD02);国家重点实验室专项课题(LQ0701)

摘　　要：对采自西安市市区的道路灰尘样品进行了系统的环境磁学及地球化学元素对比研究。磁学测试发现,样品中主要载磁矿物为准单畴/多畴(PSD/MD)磁铁矿和磁赤铁矿,部分样品含有少量赤铁矿及单质铁,来自不同污染源的样品载磁矿物种类、颗粒大小有细微差别。与对比土壤样品相比,受到污染的道路灰尘样品中磁性矿物含量更多,且颗粒较粗。综合磁学指标测试、元素分析、参数空间分布分析和相关性分析,发现与元素空间分布相比,磁学参数可以更好的反映建材市场、冶金等污染来源的分布,且不同区域不同种类样品与磁学参数相关元素种类、相关程度各不相同,在小范围内,低本底样品的指示作用更加明显。Environmental magnetic properties and element of the street dust from Xi＇an have been studied. The results showed that samples were dominated by ferromagnetic minerals, such as magnetite and maghemite, as well as some hemitite and iron, and the most magnetic domains of the minerals are pseudo-single domain（PSD） and multidomain（MD）. Due to the different sources, the samples have different domain style and different kinds of magnetic minerals.The contaminated sample have more magnetic minerals and coarse particles than the top soils.The diposition of elements could not be applied to indicated the pollution of metallurgy and building materials industry with weak instructions, on the contrary, the diposition of magnteic parameters can do it well. The correlations between magnetic parameters and element changed when sample kinds and/or sampling site changed. In small regions, samples with low background values have more obvious pollution-instruction meaning.

关 键 词：环境磁学 道路灰尘 西安市 

分 类 号：X513[环境科学与工程—环境工程]