Chelate-Enhanced Phytoremediation of Soils Polluted with Heavy Metals

Alkorta, Itziar; Hernández-Allica, Javier; Becerril, José M.; Amézaga, Ibone; Albizu, Isabel; Onaindia, Miren; Garbisu, Carlos

doi:10.1023/b:resb.0000040057.45006.34

Cited by 140 publications

(61 citation statements)

References 93 publications

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“…However, the efficiency of metal extraction is generally conceived as too slow due to the limitations of hyperaccumulator plants such as low biomass and very slow growth rate. Chelant assisted phytoextraction has been proposed to improve the efficiency of phytoextraction [6][7][8]. The chelating aminopolycarboxylic acid, ethylene diamine tetraacetate (EDTA), has been proven to enhance plant accumulation of heavy metals [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…However, the use of EDTA in phytoextraction is found not to be suitable due to its high environmental persistence or un-biodegradabe property, which may lead to secondary contamination [12]. EDTA and the formed EDTA-metal complexes have low biodegradability and high solubility in soil, resulting in an elevated risk of adverse environmental effects due to metal mobilization and long persistence [8,13]. In this respect, the amount of metal taken up by plants has been reported to be much less than the amount mobilized from the soil during EDTAinduced metal phytoextraction [14].…”

Section: Introductionmentioning

confidence: 99%

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Effects of IDSA, EDDS and EDTA on heavy metals accumulation in hydroponically grown maize (Zea mays, L.)

Zhao

Mei-zhu

Jiang

et al. 2010

Journal of Hazardous Materials

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a b s t r a c tHeavy metals contamination of soil is a widespread global problem. Chelant assisted phytoextraction has been proposed to improve the efficiency of phytoextraction which involves three subsequent levels: transfer of metals from the bulk soil to the root surfaces, uptake into the roots and translocation to the shoots. However, most studies focused on the first level. A hydroponic experiment, which addresses the latter two levels, was conducted to study the effects of EDTA, EDDS and IDSA on the uptake and the distribution of Pb, Zn, Cu and Cd in the apoplast and the symplast of roots of maize (Zea mays, L.). The concentrations of the metals (with exception of Zn) in the shoots were increased significantly by addition of all the chelants. EDTA was most effective for Pb uptake and IDSA was interestingly most effective for Cd uptake. Pb in the roots with EDTA was mostly distributed in the apoplast, while Zn, especially with IDSA, was mostly located in the symplast. The results indicated that, the capacity of chelant to enhance the nonselective apoplastic transport of metal may be most important for chelant enhanced phytoextraction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of IDSA, EDDS and EDTA on heavy metals accumulation in hydroponically grown maize (Zea mays, L.)

Zhao

Mei-zhu

Jiang

et al. 2010

Journal of Hazardous Materials

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“…The former approach uses natural hyperaccumulating plants with extremely high metal-accumulating abilities to accumulate exceptionally high specific metal content in the shoots, which are harvestable, but such plants are usually slow-growing with a low biomass yield (Alkorta et al 2004b). It has been estimated that such plants would need several years to remove all the metal from contaminated soil (Alkorta et al 2004a). However, chemically enhanced phytoextraction has been shown to overcome the above problems.…”

Section: Bioavailability and Phytoremediationmentioning

confidence: 99%

“…Common crop plants with high biomass can be triggered to accumulate vast amounts of metals when their mobility in soil is enhanced by chemical chelating agents. In addition, the effectiveness of phytoextraction for metals is highly dependent on the availability of metals for plant uptake (Garbisu and Alkorta 2001; Alkorta et al 2004a).…”

Section: Bioavailability and Phytoremediationmentioning

confidence: 99%

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Hullebusch

Lens

Tabak

2005

Rev Environ Sci Biotechnol

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The biotransformation of metals is an exciting, developing strategy to treat metal contamination, especially in environments that are not accessible to other remediation technologies. However, our ability to benefit from these strategies hinges on our ability to monitor these transformations in the environment. That's why remediation of contaminated sediments and soil requires detailed in situ characterization of the speciation of the toxic substances and their transformations with respect to time and spatial distribution. The present paper gives an overview of the literature regarding research performed in the laboratory as well as in the field.

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“…In recent years, heavy metal ion pollution has become of great concern worldwide because of the high toxicity and accumulation of such ions in the environment (Bishop 2004;Alkorta et al 2004;Papageorgiou et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

Miao

Liu

et al. 2009

Adsorption Science & Technology

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ABSTRACT:The adsorption of Pb 2+ and Ni 2+ ions from aqueous solution onto montmorillonite (MMT) has been investigated at 293 K, 303 K, 313 K and 323 K using batch equilibrium experiments. In order to optimize the adsorption conditions, the effects of contact time, solution pH and initial metal ion concentrations were tested thoroughly. The adsorption isotherms were best described by the Langmuir model at lower temperatures, while the Freundlich model gave a better fit at higher temperatures.

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Chelate-Enhanced Phytoremediation of Soils Polluted with Heavy Metals

Cited by 140 publications

References 93 publications

Effects of IDSA, EDDS and EDTA on heavy metals accumulation in hydroponically grown maize (Zea mays, L.)

Effects of IDSA, EDDS and EDTA on heavy metals accumulation in hydroponically grown maize (Zea mays, L.)

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

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Chelate-Enhanced Phytoremediation of Soils Polluted with Heavy Metals

Cited by 140 publications

References 93 publications

Effects of IDSA, EDDS and EDTA on heavy metals accumulation in hydroponically grown maize (Zea mays, L.)

Effects of IDSA, EDDS and EDTA on heavy metals accumulation in hydroponically grown maize (Zea mays, L.)

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Adsorption of Pb2+ and Ni2+ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

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Product

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Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies