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Feasibility of Phytoremediation for Metal-Contaminated Abandoned Mining Area  

Ok, Yong-Sik (Division of Environmental Science and Ecological Engineering, Korea University)
Kim, Si-Hyun (Division of Environmental Science and Ecological Engineering, Korea University)
Kim, Dae-Yeon (Division of Environmental Science and Ecological Engineering, Korea University)
Lee, Han-na (Division of Environmental Science and Ecological Engineering, Korea University)
Lim, Soo-Kil (Division of Environmental Science and Ecological Engineering, Korea University)
Kim, Jeong-Gyu (Division of Environmental Science and Ecological Engineering, Korea University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.36, no.5, 2003 , pp. 323-332 More about this Journal
Abstract
This study was carried out to provide information for the present status of soil pollution near abandoned old-zinc mining area through analysis of bound form and 0.1 N-HCl extractable concentrations of heavy metals in soils and plants. Feasibility of endemic plants for phytoremediation was evaluated by the investigation of vegetation in soils. Cd contents of the selected samples near old-zinc mining soils ranged from 0.2 to $42mg\;kg^{-1}$. Nonagricultural soils near the mining area contained great amounts of Zn, Pb, Cd, and Cu than the paddy and upland soils. Some Korean wild plants, Artemisia princeps, Artemisia montana, Erigeron canadensis, and Pueraria thunbergiana, were found to grow vigorously in the studied area. Among them, Artemisia princeps was selected as a possible phytoremediator for cleaning heavy metal contaminated soils. Artemisia princeps contained about 43 and $52mg\;kg^{-1}$ of Cd in their root and shoot as dry weight, respectively. Average contents of Cd in the rhizosphere soil, $15.68mg\;kg^{-1}$, was slightly higher than the soil-root interface soils, $14.1mg\;kg^{-1}$. Sequential extraction of Cd contaminated soils showed that average $2.4mg\;kg^{-1}$ (about 7%) of cadmium existed as exchangeable form and the average amounts increased as follows : adsorbed < organically bound < exchangeable << oxide carbonate << sulfide residual fractions. Amendment of organic by-product fertilizer in metal-contaminated soils promoted the growth of roots significantly as compared with the other treatments containing chemical fertilizer.
Keywords
Cd; Phytoremediation; Endemic plant; Sequential extraction;
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