Cumulative effects of atmospheric dust fall on major environmental elements in soils and their evaluation: A case study of Gaomi City, Shandong Province, China
JIANG Bing1,2,3(), ZHANG De-Ming1, LIU Yang1
1. Shandong Provincial No.4 Institute of Geological and Mineral Survey, Weifang 261021, China 2. Key Laboratory of Coastal Zone Geological Environment Protection of Shandong Geology and Mineral Exploration and Development Bureau, Weifang 261021, China 3. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
This study aims to investigate the pollution distribution of major environmental elements of atmospheric dust fall in Gaomi City, Shandong Province, as well as its effects on soils in a supergene environment. Hence, this study systematically collected and tested the atmospheric dust fall from Gaomi City, obtaining the testing data of nine environmental elements, including Cu, Pb, Zn, Ni, Cr, Cd, As, Hg, and Se. Furthermore, this study calculated the annual sediment fluxes and annual increments of these elements, simulated the minimum annual sediment fluxes for them to reach limit values, and evaluated their pollution levels. The results show that the average contents of various elements in atmospheric dust fall all exceeded their soil background values, exhibiting different degrees of enrichment. In terms of annual sediment fluxes, Cu was significantly positively correlated with Pb, while Zn, Ni, Cr, Cd, As, and Hg were mostly positively correlated in pairs, and Se showed a non-significant correlation with other elements. A higher correlation suggests a higher homology. Atmospheric dust fall, serving as an input end member of major environmental elements in soils, resulted in annual growth rates of various elements in topsoils ranging from 0.03%~0.52%. Cd would be the closest to its soil limit value over a few years. As revealed by geoaccumulation index-based evaluation, Ni, As, and Cr exhibited non-pollution to slight pollution, Se primarily manifested heavy pollution, Cd and Zn displayed moderate to heavy pollution, and Hg, Cu, and Pb mainly showed slight to moderate pollution, corresponding to a pollution order of Se>Cd>Zn>Hg>Cu>Pb>Ni>As>Cr.
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