PMID: 20108686Jan 30, 2010Paper

Chemodynamics of heavy metals in long-term contaminated soils: metal speciation in soil solution

Journal of Environmental Sciences (China)
Kwon-Rae Kim, Gary Owens

Abstract

The concentration and speciation of heavy metals in soil solution isolated from long-term contaminated soils were investigated. The soil solution was extracted at 70% maximum water holding capacity (MWHC) after equilibration for 24 h. The free metal concentrations (Cd2+, CU2+, Pb2+, and Zn2+) in soil solution were determined using the Donnan membrane technique (DMT). Initially the DMT was validated using artificial solutions where the percentage of free metal ions were significantly correlated with the percentages predicted using MINTEQA2. However, there was a significant difference between the absolute free ion concentrations predicted by MINTEQA2 and the values determined by the DMT. This was due to the significant metal adsorption onto the cation exchange membrane used in the DMT with 20%, 28%, 44%, and 8% mass loss of the initial total concentration of Cd, Cu, Pb, and Zn in solution, respectively. This could result in a significant error in the determination of free metal ions when using DMT if no allowance for membrane cation adsorption was made. Relative to the total soluble metal concentrations the amounts of free Cd2+ (3%-52%) and Zn2+ (11%-72%) in soil solutions were generally higher than those of Cu2+ (0.2%-30%) and P...Continue Reading

References

Jul 4, 2001·Environmental Science & Technology·H ZhangS P McGrath
Jan 5, 2002·Environmental Science & Technology·L WengW H Van Riemsdijk
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Oct 29, 2013·Journal of Hazardous Materials·R NaiduJ Harmsen

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Citations

Jul 29, 2011·Journal of Environmental Sciences (China)·Yanshan CuiXiaochen Chen
Apr 28, 2011·Journal of Environmental Sciences (China)·Shunan Zheng, Mingkui Zhang
May 28, 2019·Environmental Geochemistry and Health·Belinda K KaningaMichael J Watts

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