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Title: Potential of Brassic rapa, Cannabis sativa, Helianthus annuus and Zea mays for phytoextraction of heavy metals from calcareous dredged sediment derived soils
Authors: MEERS, Erik
Hopgood, M
Lesage, E
Tack, FMG
Issue Date: 2005
Citation: CHEMOSPHERE, 61(4). p. 561-572
Abstract: Remediation of soil pollution is one of the many current environmental challenges. Anthropogenic activity has resulted in the contamination of extended areas of land, the remediation of which is both invasive and expensive by conventional means. Phytoextraction of heavy metals from contaminated soils has the prospect of being a more economic in situ alternative. In addition, phytoextraction targets ecotoxicologically the most relevant soil fraction of these metals, i.e. the bioavailable fraction. Greenhouse experiments were carried out to evaluate the potential of four high biomass crop species in their potential for phytoextraction of heavy metals, with or without with the use of soil amendments (EDTA or EDDS). A calcareous dredged sediment derived surface soil, with high organic matter and clay content and moderate levels of heavy metal pollution, was used in the experiments. No growth depression was observed in EDTA or EDDS treated pots in comparison to untreated controls. Metal accumulation was considered to be low for phytoextraction purposes, despite the use of chelating agents. The low observed shoot concentrations of heavy metals were attributed to the low phytoavailability of heavy metals in this particular soil substrate. The mobilising effects induced by EDTA in the soil were found to be too long-lived for application as a soil amendment in phytoextraction. Although EDDS was found to be more biodegradable, higher effect half lives were observed than reported in literature or observed in previous experiments. These findings caution against the use of any amendment, biodegradable or otherwise, without proper investigation of its effects and the longevity thereof. (C) 2005 Elsevier Ltd. All rights reserved.
Notes: State Univ Ghent, Dept Appl Analyt & Phys Chem, Lab Analyt Chem & Appl Ecochem, B-9000 Ghent, Belgium. Limburgs Univ Ctr, Ctr Environm Sci, B-3590 Diepenbeek, Belgium. Univ Reading, Sch Human & Environm Sci, Dept Soil Sci, Reading RG6 6AB, Berks, England.Meers, E, State Univ Ghent, Dept Appl Analyt & Phys Chem, Lab Analyt Chem & Appl Ecochem, Coupure Links 653, B-9000 Ghent, Belgium.erik.meers@ugent.be
URI: http://hdl.handle.net/1942/2094
DOI: 10.1016/j.chemosphere.2005.02.026
ISI #: 000232898600014
ISSN: 0045-6535
Category: A1
Type: Journal Contribution
Validation: ecoom, 2006
Appears in Collections: Research publications

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