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| Screening of Phyto-eluents for Contaminated Soil in Pb-Zn Mining Area |
| Received:May 07, 2015 |
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| KeyWord:soil washing;plants;lead and zinc;influencing factors;Coriaria nepalensis |
| Author Name | Affiliation | E-mail | | CAO Ya-ru | College of Environment Science, Sichuan Agricultural University, Chengdu 611130, China
College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Shi-rong | College of Environment Science, Sichuan Agricultural University, Chengdu 611130, China | rsz01@163.com | | CHEN Yue | College of Environment Science, Sichuan Agricultural University, Chengdu 611130, China
College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | WANG Gui-yin | College of Environment Science, Sichuan Agricultural University, Chengdu 611130, China | | | LI Ting | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| Soil washing is a frequently used soil remediation technique. The key to this technique is washing agents. The objective of this study is to screen eco-friendly washing agents—phyto-eluents. We collected 14 plant species, ground the aboveground biomass to powders(< 2 mm), and made washing agents using distilled water. Then the washing efficiencies of Pb and Zn by these washing agents were examined under different concentrations, pH and contact time. At 25 ℃ and 200 r·min-1 rotational oscillation, the washing efficiencies of Pb by these agents showed either continuous increases or initial increase and then decreases as the agent concentrations increased, whereas those of Zn displayed gradual increases or slight changes with the agent concentrations. Increasing pH apparently reduced the removal efficiencies of two metals. The effect of contacting time on the removal efficiencies of two metals showed gradual increase, slight changes or decline patterns. Among these 14 plants, Coriaria nepalensis proved to have a better removal efficiency, with the removal efficiencies of Pb and Zn being 23.78% and 77.03%, respectively, at 5% eluent, pH 4.0 and a reaction time of 8 h. Therefore, C. nepalensis could be used as an environmental-friendly eluent for Pb-Zn contaminated soils. |
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