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| Leaching of Copper and Lead in Contaminated Lou Soil with Combined Saponin and EDTA |
| Received:November 06, 2014 |
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| KeyWord:EDTA;saponin;copper;lead;contaminated Lou soil;leaching;remediation |
| Author Name | Affiliation | E-mail | | DENG Hong-xia | College of Science, Northwest A&F University, Yangling 712100, China | | | LI Zhen | College of Science, Northwest A&F University, Yangling 712100, China | | | YANG Ya-li | College of Science, Northwest A&F University, Yangling 712100, China | | | XU Yan | College of Science, Northwest A&F University, Yangling 712100, China | | | YANG Ya-ti | College of Science, Northwest A&F University, Yangling 712100, China | yatiyang@nwsuaf.edu.cn |
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| Abstract: |
| In this experiment, leaching of Cu and Pb in their singly or combinedly contaminated Lou soil was studied by chelating agent ethylenediaminetetraacetic acid disodium salt(EDTA) and biosurfactant saponin in single or mixed solution, using batch shaking and soil column leaching method. Characteristics of Cu and Pb fractions were compared before and after leaching. In batch shaking test, synergistic effects on Cu and Pb leaching in contaminated Lou soil were observed in different concentrations of saponin solution combined with EDTA(0.5 mmol·L-1 or 1.0 mmol·L-1). The percentages of Pb leaching were higher than those of Cu. However, antagonistic effects on metal leaching were found at EDTA concentrations higher than 5.0 mmol·L-1. In soil column leaching test, cumulative amounts of Cu and Pb leaching in contaminated Lou soil columns increased gradually with increasing cumulative volume of leaching agents at 1.0 mmol·L-1 EDTA or 50 g·L-1 saponin and their mixture. In mix leaching of 1.0 mmol·L-1 EDTA and 50 g·L-1 saponin, the synergistic effects on Cu leaching was observed and the cumulative leaching percentage of Cu was 23.59% and 21.57% for singly and combinedly metals contaminated Lou soils, respectively, while that of Pb was 27.59% and 24.92%, respectively. Carbonate, organic, and sulfide residual fractions of Cu and Pb were effectively leached by 50 g·L-1 saponin, 1.0 mmol·L-1 EDTA and their mixture, demonstrating their significant activating effects on Cu and Pb in contaminated Lou soil. Saponin and EDTA leaching agents in combination with phytoremediation technology could be used to remediate Cu and/or Pb contaminated Lou soil. |
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