Mobility and speciation of Cd, Cu,and Zn in two acidic soils affected by simulated acid rain

Article type: Research Article

Authors: GUO, Zhao-hui | LIAO, Bo-han | HUANG, Chang-yong

Affiliations: Department of Environmental Engineering, Central South University, Changsha 410083, China | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | College of Environment and Resource, Zhejiang University, Hangzhou 310029, China

Note: [] Corresponding author. E-mail: zhguo@mail.csu.edu.cn

Abstract: Through a batch experiment, the mobility and speciation of heavy metals (Cd, Cu, Zn) in two acidic forest soils from Hunan Province were studied. The results showed that the release and potential active speciation of Cd, Cu, and Zn in the tested contaminated red soil (CRS) and yellow red soil (CYRS) increased significantly with pH decreasing and ion concentrations increasing of simulated acid rain, and these effects were mainly decided by the pH value of simulated acid rain. Cd had the highest potential risk on the environment compared with Cu and Zn. Cd existed mainly in exchangeable form in residual CRS and CYRS, Cu in organically bound and Mn-oxide occluded forms, and Zn in mineral forms due to the high background values.

Keywords: batch experiment, heavy metals, mobility, speciation, acid rain

Journal: Journal of Environmental Sciences, vol. 17, no. 2, pp. 332-334, 2005