Spatial and temporal variation in magnetic properties of street dust in Lanzhou City,China  

作　　者：WANG Guan XIA DunSheng LIU XiuMing CHEN FaHu YU Ye YANG LiPing CHEN JianHui ZHOU AiFeng 

机构地区：[1]Key Laboratory of the West Environmental System, Lanzhou University, Lanzhou 730000, China [2]Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China

出　　处：《Chinese Science Bulletin》2008年第12期1913-1923,共11页

基　　金：the National Natural Science Foundation of China (Grant Nos.40571147 and 40401064)

摘　　要：Urban environmental problems are of increasing concern. Lanzhou is a large industrial city in North-west China. Street dust samples representing different temporal and spatial scales were collected for magnetic properties study. Magnetic measurements indicate a high concentration of magnetic minerals in Lanzhou street dust, dominated by pseudo-single domain (PSD) magnetite. The concentration of magnetic materials is distinctly high in winter and spring, low in autumn. Similarly, higher concentra-tions associated with heavy industry, concentrated residential development, and vehicular traffic sug-gest mixed contributions of magnetic material from both anthropogenic and natural sources. χ_lf and SOFT% are effective magnetic parameters that denote seasonal differences among magnetic proper-ties in street dust, convenient and economical methods for monitoring street dust pollution.Urban environmental problems are of increasing concern. Lanzhou is a large industrial city in Northwest China. Street dust samples representing different temporal and spatial scales were collected for magnetic properties study. Magnetic measurements indicate a high concentration of magnetic minerals in Lanzhou street dust, dominated by pseudo-single domain （PSD） magnetite. The concentration of magnetic materials is distinctly high in winter and spring, low in autumn. Similarly, higher concentrations associated with heavy industry, concentrated residential development, and vehicular traffic suggest mixed contributions of magnetic material from both anthropogenic and natural sources. XIf and SOFT% are effective magnetic parameters that denote seasonal differences among magnetic properties in street dust, convenient and economical methods for monitoring street dust pollution.

关 键 词：磁性 街道尘埃 城市污染 兰州市 

分 类 号：X51[环境科学与工程—环境工程]