Assessments of Water-Soluble Inorganic Ions and Heavy Metals in Atmospheric Dustfall and Topsoil in Lanzhou, China

Yingquan Li, Baowei Zhao, Kaixiang Duan, Juexian Cai, Wujiang Niu and Xiao Dong
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Yingquan Li: School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Baowei Zhao: School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Kaixiang Duan: School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Juexian Cai: School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Wujiang Niu: Environmental Monitoring Center Station in Gansu Province, Lanzhou 730020, China
Xiao Dong: Gansu Dust Suppression for Transportation and Storage Engineering Research Center, Lanzhou 730070, China

IJERPH, 2020, vol. 17, issue 8, 1-13

Abstract: The chemical features of atmospheric dustfall and topsoil in the same region could reflect the processes of the migration, transport, and diffusion of pollutants in the atmospheric-soil system. Samples of atmospheric dustfall and topsoil were collected in Lanzhou City. The contents and correlation of water-soluble inorganic ions (WSIIs) and heavy metals in dustfall and topsoil were analyzed, the sources of heavy metals and WSIIs in dustfall were distinguished, and the potential ecological risks of heavy metals in dustfall and topsoil were evaluated. The highest contents of WSIIs are SO 4 2− (18,594 mg·kg −1 ) and Ca 2+ (10,070 mg·kg −1 ) in dustfall, and for SO 4 2− (8271 mg·kg −1 ) and Na + (1994 mg·kg −1 ) in topsoil. The concentrations of heavy metals (Pb, Cu, Zn, Cr, Cd, and Ni) in dustfall are considerably higher than those in topsoil. Combustion of biomass and coal, transportation and industrial activities are the major anthropogenic sources of WSIIs and heavy metals in Lanzhou. Pollution of heavy metals except Cr and Ni in dustfall, and Cu, Cr, and Ni in topsoil was up to different degrees, where the pollution of Cd was serious. The risk of Cd in dustfall is high while moderate in topsoil. This research could offer a reference for the atmospheric particle pollution prevention and control in Lanzhou.

Keywords: dustfall; topsoil; water-soluble inorganic ions (WSIIs); heavy metals; contamination characteristics; Lanzhou (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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