EDTA and HEDTA effects on Cd, Cr, and Ni uptake by Helianthus annuus

Chen, Hong; Cutright, Teresa J.

doi:10.1016/s0045-6535(01)00031-5

Cited by 286 publications

(140 citation statements)

References 25 publications

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“…The total dry weight of biomass of canola and Indian mustard was affected by the contaminated soil; on average, the metals caused a reduction of about 75% in root and shoot dry matter of both plants. Similar results in other hyperaccumulator plants were reported by Chen and Cutright (2001) Efficiency of EDTA complexing agents in enhancing soil Cu, Cd, Pb and Zn desorption. To evaluate the effect of heavy metal availability in soil on plant uptake, soil samples were collected and soluble Cu, Cd, Pb and Zn were measured.…”

Section: Resultssupporting

confidence: 90%

“…Chemical enhancements were used to overcome this problem. Several studies documented that chelating agents such as ethylenediamine-tetraacetic acid (EDTA), N-(2-hydroxyethyl)-ethylenediaminetriacetic acid (HEDTA) and citric acid (CA) can be used to increase metal mobility, thereby enhancing phytoextraction (Elless and Blaylock 2000, Chen and Cutright 2001, Chen et al 2003. Laboratory studies showed that EDTA is effective in removing Pb, Zn, Cu and Cd from contaminated soils, although extraction efficiency depends on many factors such as the lability of heavy metals in soil, the strength of EDTA, electrolytes, pH and soil matrix (Elliott and Brown 1989, Brown and Elliot 1992, Heil et al 1999, Papassiopi et al 1999.…”

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confidence: 99%

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Phytoremediation based on canola (Brassica napus L.) and Indian mustard (Brassica juncea L.) planted on spiked soil by aliquot amount of Cd, Cu, Pb, and Zn

Turan¹,

Esringü²

2007

PLANT SOIL ENVIRON

125

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The use of plants to remove heavy metals from soil (phytoremediation) is expanding due to its cost-effectiveness as compared to conventional methods and it has revealed a great potential. Since contaminants such as Pb or Cd have a limited bioavailability in the soil, methods to facilitate their transport to the shoots and roots of plants are required for successful phytoremediation. The objective of this study was to investigate the effects of addition of different rates (0, 3, 6 and 12 mmol/kg) of ethylene diaminetetraacetate (EDTA) on heavy metal availability in soils contaminated with 50 mg/kg Cd (CdCl 2 ), 50 mg/kg Cu (CuSO 4 ), 50 mg/kg Pb [Pb(NO 3 ) 2 ] and 50 mg/kg Zn (ZnSO 4 ), and on the capacity of canola (Brassica napus L.) and Indian mustard (Brassica juncea L.) plants to uptake Cu, Cd, Pb and Zn in a growth chamber. Results indicated that EDTA application increased heavy metal availability and uptake by plants. Significant differences were obtained in both species and plant parts. As for plant species tested, canola was more effective in the uptake of Cu, Cd, Pb and Zn. Root heavy metal uptake of both species was higher than shoot heavy metal uptake.

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Section: Resultssupporting

confidence: 90%

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confidence: 99%

Phytoremediation based on canola (Brassica napus L.) and Indian mustard (Brassica juncea L.) planted on spiked soil by aliquot amount of Cd, Cu, Pb, and Zn

Turan¹,

Esringü²

2007

PLANT SOIL ENVIRON

125

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“…Indeed chelateenhanced phytoextraction is now close to commercial application (Mohan and Hosetti, 2002;Watanabe, 1997). The use of chelating agents has been studied for the removal of Cd, Cr, Ni, Zn, Cu, and U from soils (Chen and Cutright, 2001;Huang et al, 1997Huang et al, ,1998Kayser et al, 2000). However, one consequence of the addition of a chelating agent to soil is a rapid increase in the solubility of metal ions, which results in a subsequent increase in the risk of leaching of metals to groundwater (Barona et al, 2001;Wu et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…The study was conducted in a greenhouse, and on mobile fractions of Pb and Zn in the soil using column leaching techniques. We hypothesize that upon the addition of metal chelating agents to a contaminated soil, more metal ions will be mobilized than plants can absorb in a short period (Barona et al, 2001) without suffering phytotoxic effects such as depression of biomass production (Chen and Cutright, 2001). …”

Section: Introductionmentioning

confidence: 99%

Slow release chelate enhancement of lead phytoextraction by corn (Zea mays L.) from contaminated soil—a preliminary study

Wang

Cui

et al. 2005

Science of The Total Environment

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(2005). Slow release chelate enhancement of lead phytoextraction by corn (Zea mays L.) from contaminated soil: A preliminary study. Science of The Total Environment, 339(1-3), 179-187. DOI: 10.1016179-187. DOI: 10. /j.scitotenv.2004 Published in: Science of The Total Environment Queen's University Belfast -Research Portal: Link to publication record in Queen's University Belfast Research Portal General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Abstract Short-term enhancement of lead (Pb) and zinc (Zn) uptake by corn (Zea mays L.) seedlings from a contaminated soil was compared using slow-release coated EDTA granules-a coated chelating agent (CCA), uncoated EDTA granules, and EDTA solution in a greenhouse experiment. Soil Pb and Zn fractions were determined using a sequential extraction scheme. Release of the metals in the soil was examined in a column leaching study. After only 7 days of seedling growth, shoot biomass was decreased by all EDTA treatments compared with the zero-EDTA control. The amount of shoot biomass produced was highest with uncoated EDTA, intermediate with CCA, and lowest with the EDTA solution. Shoot Pb contents were highest with solid EDTA, intermediate with CCA, and lowest with EDTA solution, and they were always higher with EDTA treatments than in controls. In contrast, shoot Zn contents following EDTA treatments were lower than in the control. Levels of soil dissolved organic carbon (DOC) in aqueous soil extracts were much lower after CCA application than following treatments with solid EDTA and EDTA solution. After 17 days of plant growth, when most of the chelating agent had been released from the CCA, soil organic carbon levels remained relatively constant and similar to those in the control, indicating that a relatively low chelating agent concentration can be maintained for the plants to take up the metals. The distribution of Pb in the sequential extraction procedure showed that the Pb level in the exchangeable+carbonate-bound fraction with CCA was significantly lower than that with solid EDTA or EDTA solution, further indicating that slow release of CCA improves the bioavailability of metals in the soil to match plant uptake of those metals. The results suggest that CCA can enhance shoot content of Pb but not of Zn from the contaminated soil in the short term, and may also reduce the risk of metal leaching from the soil. D

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“…However, most hyperaccumulators used in removing these HMs have lower biomass and growing rate and thus extending the period needed in decontamination. The application of chemical agents has significant effect on increasing the phytoavailability and accumulation of HMs of plants (Chen & Cutright, 2001;Meers et al, 2004;Meers et al, 2005). However, results of most previous studies showed that chemical agents have negative effect on the growth of Indian mustard, sunflower, or corn and thus decreased the total removal of HMs by plants (Blaylock et al, 2007;Madrid et al, 2003;Turgut et al, 2004).…”

Section: Introductionmentioning

confidence: 99%