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Abstract
Magnetic susceptibility is an important means to quickly and economically monitor the enrichment of surrounding environmental elements. As a regional central city on the Qinghai-Tibet Plateau, the relationship between atmospheric dust magnetic susceptibility and heavy metal content in Xining area is relatively lacking. In this paper, the magnetic susceptibility and geochemical element content of the collected dust samples, loess samples, surface soil samples and soil profile samples obtained through long-term observations are analyzed. The results show that the magnetic susceptibility of the dust-fall samples is the highest, the soil samples are the second, and the loess samples are the lowest; the magnetic susceptibility of the dust-fall samples in Xining City has a significant correlation with the elements Cd, Cr, Ni, Cu, Pb, Zn and Hg, and the magnetic susceptibility can be used as an indicator of heavy metal in the soil; the elements Cr, Ni, Cu, Zn and As in the soil profile are enriched at 20 cm or 30 cm, which is related to the leaching of surface elements.
Highlights
Environmental magnetism, developed in the 1980s, was a borderline science between environmental science, earth science and magnetism [1,2]
Chen et al [5] found that the magnetic susceptibility characteristics of roadside soil in Xi’an are significantly positively correlated with geochemical elements, Xiao [6] found that the magnetic susceptibility of soil in Fuzhou is correlated with the content of heavy metal elements
Cui et al [9] studied the levels of heavy metals in atmospheric dustfall in Shijiazhuang City and found that the main sources of heavy metal elements in dustfall are coal burning activities, road traffic, industrial and mining enterprise exhaust emissions and soil particulate matter.The heavy metal content in highvalue areas of atmospheric dustfall is consistent with the distribution of industrial areas
Summary
Environmental magnetism, developed in the 1980s, was a borderline science between environmental science, earth science and magnetism [1,2]. The current research on urban atmospheric dust fall focuses on the physical and chemical properties and heavy metal pollution. There are relatively few studies that combine urban atmospheric dust with loess and soil to analyze the relationship between magnetic susceptibility and geochemical elements. Cui et al [9] studied the levels of heavy metals in atmospheric dustfall in Shijiazhuang City and found that the main sources of heavy metal elements in dustfall are coal burning activities, road traffic, industrial and mining enterprise exhaust emissions and soil particulate matter.The heavy metal content in highvalue areas of atmospheric dustfall is consistent with the distribution of industrial areas. Zhao et al [10] used correlation analysis and principal component analysis methods to analyze the atmospheric dustfall samples collected in Jinan city in order to find out the content characteristics and pollution sources of the elements in the near-surface atmospheric dustfall in Jinan City. It is found that the elements Cd, Pb, Zn, and Se in the atmospheric dust may come from burning coal, the elements Cr and Ni come from soil dust, the elements CaO and As come from building dust, the element F mainly comes from automobile exhaust emissions, and Hg is affected by the factors such as combustion, coal, smelting and transportation
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