Relationships between heavy metals and iron oxides,fulvic acids,particle size fractions in urban roadside soils |
| |
| Authors: | Xue-Song Wang Yong Qin |
| |
| Institution: | (1) Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu, 222005, China;(2) College of Mineral Resources and Geo-science, China University of Mining and Technology, Xuzhou, Jiangsu, 221008, China |
| |
| Abstract: | Urban roadside soils are the “recipients” of large amounts of heavy metals from a variety of sources including vehicle emissions,
coal burning waste and other activities. The behavior of heavy metals in urban roadside soils depends on the occurrence as
well as the total amount. Accordingly, knowledge of the interactions between heavy metals and other constituents in the soil
is required to judge their environmental impact. In this study, correlations of heavy metal concentrations (Pb, Zn, Cu, Ag,
Se, Ni, Cr and Ba) to iron extracted using dithionite–citrate–bicarbonate (DCB) buffer (FeDCB), fulvic acids and particle size fractions were examined from the Xuzhou urban roadside soils. Heavy metals except for Cr
and fulvic acids had a positive significant correlation with FeDCB, indicating these metals and fulvic acids are principally associated with the surfaces of iron oxides of the soils. Significant
positive correlations were also found between the contents of fulvic acids and heavy metals, showing these heavy metals (especially
for Cu, Ni and Cr) form stable complexes with fulvic acids. Such finding is of importance with regard to the increased mobilization
of heavy metals, e.g., into freshwater ecosystems. Ag, Se and Cr are independent of particle size fractions because of their
low concentrations of Ag and Se in the studied soils. Pb, Zn, Cu, Ba and Ag are mainly enriched in the finer soil particles
(especially <16 μm). |
| |
| Keywords: | Dithionite– citrate– bicarbonate buffer extraction Iron oxides Fulvic acids Particle size fraction Urban roadside soils Xuzhou China |
| 本文献已被 SpringerLink 等数据库收录！ |
|
