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Evaluation on Extractability of Heavy Metals in Mine Tailings of Disused Metal Mines with Concentrations and Kinds of Soil Washing Solutions  

Kim, Joung-Dae (Department of Health & Environment, Hallym College)
NamKoong, Wan (Innovative Environmental Technology Center, Konkuk University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.8, 2005 , pp. 787-798 More about this Journal
Abstract
The objectives of this study were to assess extraction kinetics of heavy metals with extraction times and to assess extraction efficiencies of heavy metals with concentrations and kinds of washing solutions. Target materials were obtained from disused metal mines. Washing solutions were water, HCl(0.1, 0.3, 1.0 N), EDTA(0.01, 0.05, 0.1 M), and sodium dodecyl sulfate(SDS, 0.1. 0.5, 1.0%). Extraction efficiencies of heavy metals by water and SDS were below 1%, and extraction efficiencies of Zn and Cd were higher than those of Pb and Cu. As results, water and SDS were not effective in extracting heavy metals from mine tailings as washing solution, but extraction efficiencies of Pb and Cu with SDS solution increased as extraction time increased. Extraction kinetics of heavy metals with HCl and EDTA were faster than those with water and SDS. The majority of heavy metals were extracted within 6 hours, and extraction kinetics was almost independent of the solution concentration. Extraction kinetics of heavy metals after 6 hours was slow, but extraction kinetics was dependent on the solution concentration. Also, as concentrations of HCl and EDTA solution were stronger, heavy metals were extracted rapidly and extraction efficiencies were increased. The extraction efficiency was high in order of Cd>Pb>Zn>Cu in using 1.0 N HCl, and Pb>Cd>Zn>Cu in using 0.1 M EDTA. Consequently, extraction effectiveness was highest for Pb in using HCl, and for Pb and Cd in using EDTA with concentration increase. Extraction time of over 6 hours was not effective in extracting heavy metals.
Keywords
Disused Metal Mines; Mine Tailings; Soil Washing Solution; Extraction Kinetics; Heavy Metals;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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