| 可生物降解螯合剂GLDA诱导东南景天修复重金属污染土壤的研究 |
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| 引用本文： | 卫泽斌,陈晓红,吴启堂,谭蒙. 可生物降解螯合剂GLDA诱导东南景天修复重金属污染土壤的研究[J]. 环境科学, 2015, 36(5): 1864-1869 |
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| 作者姓名： | 卫泽斌 陈晓红 吴启堂 谭蒙 |
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| 作者单位： | 华南农业大学资源环境学院，广东高校土壤环境与废物资源农业利用重点实验室，广州 510642 |
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| 基金项目： | 广东省科技计划项目(2012A030700003); 国家高技术研究发展计划(863)项目(2012AA06A202); 广东省自然科学基金团队项目(S2011030002882) |
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| 摘 要： | 化学强化的植物提取技术可以有效地去除污染土壤的重金属.用盆栽试验的方法,研究了可生物降解螯合剂谷氨酸N,N-二乙酸(GLDA)不同用量或者与乙二胺四乙酸(EDTA)、柠檬酸复配使用对超富集植物东南景天吸收土壤重金属Cd、Zn和Pb的影响.结果表明,施用GLDA提高了东南景天对土壤Cd和Zn的提取效率,GLDA用量为2.5 mmol·kg-1时东南景天对Cd和Zn的提取量最高,分别是对照的2.5倍和2.6倍.螯合剂的总用量为5 mmol·kg-1时,EDTA、柠檬酸分别与GLDA复配,未能进一步促进东南景天对土壤Cd和Zn的提取.上述结果表明,可生物降解螯合剂GLDA在诱导植物修复重金属污染土壤特别是Cd和Zn污染土壤具有明显潜力.
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| 关 键 词： | 植物提取 GLDA 东南景天 重金属 可生物降解 |
| 收稿时间： | 2014-11-12 |
| 修稿时间： | 2014-12-19 |
Enhanced Phytoextraction of Heavy Metals from Contaminated Soils Using Sedum alfredii Hance with Biodegradable Chelate GLDA |
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| WEI Ze-bin,CHEN Xiao-hong,WU Qi-tang and TAN Meng. Enhanced Phytoextraction of Heavy Metals from Contaminated Soils Using Sedum alfredii Hance with Biodegradable Chelate GLDA[J]. Chinese Journal of Environmental Science, 2015, 36(5): 1864-1869 |
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| Authors: | WEI Ze-bin CHEN Xiao-hong WU Qi-tang TAN Meng |
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| Affiliation: | Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong Higher Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong Higher Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong Higher Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong Higher Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China |
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| Abstract: | Chemically enhanced phytoextraction by hyperaccumulator has been proposed as an effective approach to remove heavy metals from contaminated soil. Pot experiment was conducted to investigate the effect of application of the biodegradable chelate GLDA (L glutamic acid N, N-diacetic acid) at different doses or the combination of GLDA with EDTA (ethylenediamine tetraacetic acid) or CIT (citric acid) on the uptake of Cd, Zn and Pb by Sedum alfredii Hance (a Zn and Cd hyperaccumulator). Experimental results showed that GLDA addition to soil significantly increased the concentrations of Cd and Zn in Sedum alfredii Hance and its Cd and Zn phytoextraction compared to the control. Additionally, GLDA at 2.5 mmol ·kg-1 resulted in the highest phytoextraction, being 2.5 and 2.6 folds of the control for Cd and Zn, respectively. However, the combined application of GLDA+EDTA (1:1) and GLDA+CIT(1:1 and 1:3) at a total dose of 5 mmol ·kg-1 did not increase the phytoextraction of Zn and Cd, compared to the GLDA only treatment. Therefore, the biodegradable chelate GLDA could be regarded as a good chelate candidate for the phytoextraction of heavy metals of heavy metals from contaminated soils, particularly for Cd and Zn contaminated soils. |
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| Keywords: | phytoextraction GLDA Sedum alfredii heavy metal biodegradable |
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