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http://dx.doi.org/10.7844/kirr.2013.22.5.13

The Effect of pH on Citric Acid Leaching of Soil Contaminated with Heavy Metals  

Jung, Kyungbae (Department of Energy & Resources Engineering, Korea Maritime University)
Park, Hongki (Department of Energy & Resources Engineering, Korea Maritime University)
Yoo, Kyoungkeun (Department of Energy & Resources Engineering, Korea Maritime University)
Park, Jay Hyun (Institute of Mine Reclamation Technology, Mine Reclamation Corporation)
Choi, Ui Kyu (Institute of Mine Reclamation Technology, Mine Reclamation Corporation)
Publication Information
Resources Recycling / v.22, no.5, 2013 , pp. 13-19 More about this Journal
Abstract
The effect of pH on the citrate leaching behavior of heavy metal ion was investigated to develop an eco-friendly process for removing heavy metals from soil contaminated with copper, zinc, and lead. The leaching tests were performed using citrate solution with pH adjusted by mixing citric acid and sodium citrate under the following leaching conditions: particle size, under $75{\mu}m$; temperature, $50^{\circ}C$; citrate concentration, $1kmol/m^3$; pulp density, 5%; shaking speed, 100 rpm; leaching time, 1 hour. The difference of pH before and after the leaching test was not observed, and this result indicates the direct effect of hydrogen ion concentration on the leaching of metals was insignificant. The removal ratios of copper, zinc, and lead from the contaminated soil decreased with increasing pH. The thermodynamic calculation suggests that the leaching behaviors of metal ions were determined by two reactions; one is the reaction to form complex ions between heavy metal ions and citrate ion species, and the other is the reaction to form metal hydroxide between heavy metal ions and hydroxide ion.
Keywords
citrate; heavy metals; contaminated soil; leaching behavior;
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