Source and Migration Pathways of Heavy Metals in Soils from an Iron Mine in Baotou City, China

Author:

Wang Changyu12,Xu Danhong34,Li Yongli12,Zhou Wenhui12,Bian Peng12,Zhang Siyuan12

Affiliation:

1. Hohhot General Survey of Natural Resources Center, China Geological Survey, Hohhot 010010, China

2. Innovation Base for Water Resource Exploration and Eco-Environmental Effects in the Daheihe Basin of the Yellow River, Hohhot 010010, China

3. Tianjin Center, China Geological Survey, Tianjin 300170, China

4. North China Center of Geoscience Innovation, Tianjin 300170, China

Abstract

The exploitation of iron ore could cause heavy metals pollution in the soils, which threatens the ecosystem and human health. In this study, soil, stream sediment, tailings, rock, and atmospheric deposition samples were collected from an iron mine in Baotou City. The concentrations of As, Cd, Cr, Cu, Hg, Ni, Pb, Zn, Al2O3, CaO, K2O, MgO, Na2O, SiO2, and Fe2O3, as well as the mineral composition and heavy metal speciation of the samples, were analyzed for pollution assessment and source identification of heavy metals. The results reveal that the concentration of Cu in the soils was significantly higher than the background value, and an unpolluted to moderately polluted state was the main pollution level. By analyzing the relationship between Cu/Al2O3 and CaO in different samples, as well as the characteristics of the chemical index of alteration (CIA), mineral composition, and the chemical speciation of Cu in soils and profiles, the results suggest that tailings were the source of Cu pollution in soils. The distribution characteristics of Cu and CaO in stream sediments indicated that hydraulic transport may be one of the main migration pathways. In addition, wind transport may also be a pathway of migration.

Funder

China Geological Survey Projects

Publisher

MDPI AG

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