Document Detail


Evaluation of the effect of small organic acids on phytoextraction of Cu and Pb from soil with tobacco Nicotiana tabacum.
MedLine Citation:
PMID:  16337259     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Phytoremediation, the use of plants to extract contaminants from soils and groundwater, is a promising approach for cleaning up soils contaminated with heavy metals. However its use is limited by the time required for plant growth, the nutrient supply and, moreover, by the limited metal uptake capacity. Synthetic chelators have shown positive effects in enhancing heavy metal extraction, but they have also revealed several negative side-effects. The objective of this study was to investigate the use of three natural low molecular weight organic acids (NLMWOA) (citric, oxalic, and tartaric acid) as an alternative to synthetic chelators. Slurry-, column-, toxicity- and phytoextraction experiments were performed. For the phytoextraction experiment the three NLMWOA were applied to a copper- and a lead-contaminated soil respectively. A significant increase in copper uptake was visible only in the citric acid treatment (67 mg kg-1) in comparison to the EDTA treatment (42 mg kg-1). The NLMWOA application showed no enhanced effect concerning the lead phytoextraction. A possible explanation for this lack of significance could be the rate of the degradation of NLMWOA. This rate might well be too high for these heavy metals with low mobility and bioavailability such as lead. The amounts of NLMWOA applied to the soil were very high (62.5 mmol kg-1 of soil) and the effect was too little. In this respect EDTA, which was applied in very small amounts (0.125 mmol kg-1) was more efficient. Thus making NLMWOA unsuitable to enhance phytoextraction of heavy metals from soil.
Authors:
Michael W H Evangelou; Mathias Ebel; Andreas Schaeffer
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Publication Detail:
Type:  Journal Article     Date:  2005-12-06
Journal Detail:
Title:  Chemosphere     Volume:  63     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-04-28     Completed Date:  2006-06-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  996-1004     Citation Subset:  IM    
Affiliation:
Institut für Biologie V, RWTH Aachen, Worringerweg 1, 52056 Aachen, Germany. evangelou@bio5.rwth-aachen.de
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MeSH Terms
Descriptor/Qualifier:
Acids, Acyclic / chemistry*
Biodegradation, Environmental
Copper / analysis*
Hydrogen-Ion Concentration
Lead / analysis*
Soil / analysis*,  standards
Soil Pollutants / analysis*
Tobacco / growth & development*
Chemical
Reg. No./Substance:
0/Acids, Acyclic; 0/Soil; 0/Soil Pollutants; 7439-92-1/Lead; 7440-50-8/Copper

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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