title: Detecting the sensitivity of magnetic response on different pollution sources--A case study from typical mining cities in northwestern China.
abstract: Rapid monitoring and discriminating different anthropogenic pollution is a key scientific issue. To detect the applicability and sensitivity of magnetic measurements for evaluating different industrial pollution in urban environment, characteristics of topsoil from three typical fast developing industrial cities (Jinchang, Baiyin and Jiayuguan in Gansu province, northwestern China) were studied by magnetic and geochemical analyses. The results showed that magnetic susceptibility was enhanced near industrial areas, and PSD-MD magnetite dominated the magnetic properties. Magnetic concentration parameters (χlf, SIRM, and χARM) showed different correlations with heavy metals and PLI in the three cities, indicating significantly different magnetic response to different pollution sources. Principal component analysis showed that ferrimagnetic minerals coexist with heavy metals of Fe, As, Cu, Pb, and Zn in Baiyin and Fe, V, Cu, Mn, Pb, and Cr in Jiayuguan. Fuzzy cluster analysis and regression analysis further indicated that the sensitivity of magnetic monitoring to fuel dust is higher than that to mineral dust near non-ferrous metal smelters, and fossil fuel consumption is an important factor for increasing magnetite content. In all the three cities, the sensitivity of magnetic monitoring to pollutants from steel plants is much higher than that from non-ferrous metal plants. Therefore, magnetic proxies provide a rapid means for detecting heavy metal contamination caused by multi-anthropogenic pollution sources in a large scale area, however, the sensitivity was controlled by pollution sources.
authors.affiliation: Key Laboratory of Land Surface Process & Climate Change in Clod & Arid Regions, Clod & Arid Regions Environmental & Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of West China's Environmental System (Ministry of Education), Lanzhou University of China, Lanzhou 730000, China. Electronic address: wangbo@lzb.ac.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.affiliation: Key Laboratory of West China's Environmental System (Ministry of Education), Lanzhou University of China, Lanzhou 730000, China.
authors.forename: Dunsheng
authors.initials: D
authors.lastname: Xia
authors.affiliation: Key Laboratory of Land Surface Process & Climate Change in Clod & Arid Regions, Clod & Arid Regions Environmental & Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Key Laboratory of West China's Environmental System (Ministry of Education), Lanzhou University of China, Lanzhou 730000, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Jia
authors.affiliation: Key Laboratory of West China's Environmental System (Ministry of Education), Lanzhou University of China, Lanzhou 730000, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Nie
authors.affiliation: Key Laboratory of West China's Environmental System (Ministry of Education), Lanzhou University of China, Lanzhou 730000, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
mesh_terms: D002681:China; D002947:Cities / Q000706:statistics & numerical data; D016000:Cluster Analysis; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000032:analysis* / Q000706:statistics & numerical data; D006801:Humans; D007221:Industry; D060328:Magnetic Phenomena; D019216:Metals, Heavy / Q000032:analysis*; D012044:Regression Analysis
chemical_list: D004391:Dust; D019216:Metals, Heavy
keywords: Heavy metals; Magnetic properties; Mineral dust; Mining city; Topsoil