Chelate-enhanced phytoremediation of soils polluted with heavy metals

被引：110

作者：

Alkorta I. ^{[1
]}

Hernández-Allica J. ^{[2
]}

Becerril J.M. ^{[3
]}

Amezaga I. ^{[3
]}

Albizu I. ^{[2
]}

Onaindia M. ^{[3
]}

Garbisu C. ^{[2
]}

机构：

[1] Unidad de Biofísica, Centro Mixto UPV/EHU, E-48080 Bilbao

[2] NEIKER, Basque Institute of Agricultural Research and Development, E-48160 Derio

[3] Department of Plant Biology and Ecology, University of the Basque Country, E-48080 Bilbao

来源：

Reviews in Environmental Science and Biotechnology | 2004年 / 3卷 / 1期

关键词：

Assisted phytoremediation; Bioavailability; Chelating agents; Enhanced phytoremediation; Ethylenediaminetetraacetic acid (EDTA); Induced phytoremediation; Phytoextraction;

D O I：

10.1023/B:RESB.0000040057.45006.34

中图分类号：

学科分类号：

摘要：

In general, hyperaccumulators are low biomass, slow-growing plants. High biomass non-hyperaccumulator plants by themselves are not a valid alternative for phytoextraction as they also have many limitations, such as small root uptake and little root-to-shoot translocation. In this context, chemically-induced phytoextraction (based on the fact that the application of certain chemicals, mostly chelating agents, to the soil significantly enhances metal accumulation by plants) has been proposed as an alternative for the cleaning up of metal polluted soils. But chelate-induced phytoextraction increases the risk of adverse environmental effects due to metal mobilization during extended periods of time. In order to minimize the phytotoxicity and environmental problems associated with the use of chelating agents, nowadays, research is being carried out on the gradual application of small doses of the chelating agent during the growth period. However, EDTA utilization in the future will most likely be limited to ex situ conditions where control of the leachates can be achieved. There are other mobilizing agents which are much less harmful to the environment such as citric acid, NTA, and particularly EDDS. Research should also be aimed towards more innovative agronomic practices. Environmentally safe methods of chelate-induced phytoextraction must be developed before steps towards further development and commercialization of this remediation technology are taken. Most importantly, more applied projects in this field are needed to clarify the real potential and risks of this technology. © 2004 Kluwer Academic Publishers.

引用

页码：55 / 70

页数：15

共 90 条

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