| 石灰水对混合试剂洗脱土壤重金属淋洗效果的影响 |
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| 引用本文： | 郭晓方,卫泽斌,薛建华,张丽平,吴启堂.石灰水对混合试剂洗脱土壤重金属淋洗效果的影响[J].土壤,2017,49(1):129-134. |
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| 作者姓名： | 郭晓方 卫泽斌 薛建华 张丽平 吴启堂 |
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| 作者单位： | 1. 太原科技大学环境与安全学院,太原,030024;2. 华南农业大学资源环境学院,广州,510642;3. 北京航天长征飞行器研究所,北京,100076 |
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| 摘 要： | 为了探索石灰水对混合试剂(MC)洗脱后土壤中重金属的淋洗效果,对重金属污染土壤进行了盆栽淋洗试验研究。结果表明:石灰水淋洗MC洗脱土壤,淋出液中Cd、Zn、Pb和Cu浓度均显著高于去离子水淋洗MC洗脱土壤,这主要由于石灰水提高土壤pH,释放土壤所吸附的络合态重金属,这种现象在酸性污染土壤中表现更明显。对于酸性污染土壤,可采用MC+石灰水+去离子水依次进行淋洗处理,其Cd和Zn去除率与MC+去离子水+去离子水依次淋洗处理相比提高22.6%和28.8%;对于中性重金属污染土壤,两处理间重金属去除率差异不显著。石灰水淋洗可提高土壤重金属去除率,并提高土壤pH,改善MC洗脱对土壤的酸化,有利于淋洗后土壤的农业利用。
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| 关 键 词： | 土壤淋洗 重金属 混合试剂(MC) 石灰水 |
| 收稿时间： | 2016/3/28 0:00:00 |
| 修稿时间： | 2016/4/12 0:00:00 |
Effects of Lime Solution on Mixture of Chelators Extraction of Heavy Metals from Contaminated Soil |
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| GUO Xiaofang,WEI Zebin,XUE Jianhu,ZHANG Liping and WU Qitang.Effects of Lime Solution on Mixture of Chelators Extraction of Heavy Metals from Contaminated Soil[J].Soils,2017,49(1):129-134. |
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| Authors: | GUO Xiaofang WEI Zebin XUE Jianhu ZHANG Liping and WU Qitang |
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| Institution: | School of Environment and Safety,Taiyuan University of Science and Technology,College of Natural Resources and Environment,South China Agricultural University,Beijing Institute of Space Long March Vehicle,School of Environment and Safety,Taiyuan University of Science and Technology,College of Natural Resources and Environment,South China Agricultural University |
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| Abstract: | In order to research the effects of lime solution on mixture of chelators (MC) extraction of heavy metals from contaminated soil, pot leaching experiments were carried out. Result showed that the concentrations of Cd, Zn, Pb and Cu in leachate were significantly increased with lime solution leaching the MC-washed soil. The reason was the adsorption of metal-ligand complex by the mineral surface can decrease with an increasing pH by lime solution. This phenomenon was more obvious in the acid contaminated soil. The removal rate of Cd and Zn were increased by 22.6% and 28.8% with leaching by MC + lime solution + deionized water in the acidic contaminated soil, respectively, compared to the treatment with MC + deionized water + deionized water. However, the differences were not significant in the neutral contaminated soil. This study suggests that soil leaching using lime solution increase the removal rate of heavy metals and increase the pH in MC-washed soil. This is suit to agricultural use on the wash-soil. |
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| Keywords: | soil leaching mixture of chelators (MC) lime solution |
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