Chelate-Assisted Phytoextraction of Lead from a Contaminated Soil Using Wheat ( Triticum aestivum L.)

Begonia, Maria; Begonia, G. B.; Butler, Afrachanna D.; Burrell, M.; Ighoavodha, O.; Crudup, B.

doi:10.1007/s001280311

Cited by 15 publications

(8 citation statements)

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“…Vassil et al [ 21 ] also demonstrated that free protonated EDTA (H-EDTA) was more phytotoxic to Brassica juncea than a Pb-EDTA complex. From earlier studies [ 25 ], we also observed the relative tolerance of wheat to Pb-EDTA complex. These previous findings support our present observation that a Pb-chelate complex was relatively nonphytotoxic to tall fescue, a monocotyledonous plant like wheat.…”

Section: Discussionmentioning

confidence: 86%

“…Root depth and density are important factors in phytoextraction. It was observed that during the duration of the study, the root system of tall fescue was extensive similar to the fibrous root systems of most monocots including wheat in our previous studies [25]. Roots provide a large surface-to-volume ratio to maximize the total uptake of various elements and compounds from the soil [37].…”

Section: Discussionmentioning

confidence: 92%

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Lead Accumulation by Tall Fescue (Festuca arundinacea Schreb.) Grown on a Lead-Contaminated Soil

Begonia

Ighoavodha

et al. 2005

IJERPH

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Phytoextraction is gaining acceptance as a cost-effective and environmentally friendly phytoremediation strategy for reducing toxic metal levels from contaminated soils. Cognizant of the potential of this phytoremediation technique as an alternative to expensive engineering-based remediation technologies, experiments were conducted to evaluate the suitability of some plants as phytoextraction species. From one of our preliminary studies, we found that tall fescue (Festuca arundinacea Schreb. cv. Spirit) can tolerate and accumulate significant amounts of lead (Pb) in its shoots when grown in Pb-amended sand. To further evaluate the suitability of tall fescue as one of the potential crop rotation species for phytoextraction, a study was conducted to determine whether the addition of ethylenediaminetetraacetic acid (EDTA) alone or in combination with acetic acid can further enhance the shoot uptake of Pb. Seeds were planted in 3.8 L plastic pots containing top soil, peat, and sand (4:2:1, v:v:v) spiked with various levels (0,1000, 2000 mg Pb/kg dry soil) of lead. At six weeks after planting, aqueous solutions (0, 5 mmol/kg dry soil) of EDTA and acetic acid (5 mmol/kg dry soil) were applied to the root zone, and all plants were harvested a week later. Results revealed that tall fescue was relatively tolerant to moderate levels of Pb as shown by non-significant differences in root and shoot biomass among treatments. An exception to this trend however, was the slight reduction in root and shoot biomass of plants exposed to the highest Pb level in combination with the two chelates. Root Pb concentration increased with increasing level of soil-applied Pb. Further increases in root Pb concentrations were attributed to chelate amendments. Translocation index, which is a measure of the partitioning of the metal to the shoots, was significantly enhanced with chelate addition especially when both EDTA and acetic acid were used. Chelate-induced increases in translocation indices correspondingly led to higher shoot Pb concentrations.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 92%

Lead Accumulation by Tall Fescue (Festuca arundinacea Schreb.) Grown on a Lead-Contaminated Soil

Begonia

Ighoavodha

et al. 2005

IJERPH

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“…It has been suggested that high-biomass crops be used, such as maize (Zea mays L.), peas (Pisum sativum L.), oats (Avena sativa L.), barley (Hordeum vulgare L.), wheat (Triticum aestivum L.), Indian mustard (Brassica juncea L.) and cabbage (Brassica rapa L. subsp. chinensis), with appropriate chemical treatments to enhance the solubility of metals in soil and translocation from the roots to the shoots (Huang and Cunningham, 1996;Blaylock et al, 1997;Huang et al, 1997;Ebbs and Kochian, 1998;Begonia et al, 2002;Shen et al, 2002). Several chelating agents, such as CDTA, DTPA, EDDHA, EDDS, EDTA, EGTA, HEDTA and NTA, have been studied for their ability to dissolve metals and enhance the uptake of metals by plants (Blaylock et al, 1997;Huang and Cunningham, 1996;Huang et al, 1997;Ebbs and Kochian, 1998;Cooper et al, 1999;Wu et al, 1999;Kayser et al, 2000; Kos and Leštan, 2002).…”

Section: Introductionmentioning

confidence: 99%

Leaching and uptake of heavy metals by ten different species of plants during an EDTA-assisted phytoextraction process

2004

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In a pot experiment, the potential use of 10 plant species, including six dicotyledon species and four monocotyledon species, was investigated for the EDTA-enhanced phytoextraction of Pb from contaminated soil. Mung bean and buckwheat had a higher sensitivity to the EDTA treatment in soils. In the 2.5 and 5.0 mmol kg(-1) EDTA treatments, the Pb concentrations in the shoots of the six dicotyledon species ranged from 1,000 to 3,000 mg kg(-1) of dry matter, which were higher than those of the monocotyledon species. The highest amount of phytoextracted Pb (2.9 mg Pb pot(-1)) was achieved in sunflowers, due to the high concentration of Pb in their shoots and large biomass, followed by corns (1.8 mg Pb pot(-1)) and peas (1.1 mg Pb pot(-1)). The leaching behavior of heavy metals as a result of applying EDTA to the surface of the soil was also investigated using short soil-leaching columns (9.0-cm diameter, 20-cm height) by the percolation of artificial rainfall. About 3.5%, 15.8%, 13.7% and 20.6% of soil Pb, Cu, Zn and Cd, respectively, were leached from the soil columns after the application of 5.0 mmol kg(-1) of EDTA. The growth of sunflowers in the soil columns had little effect on the amount of metals that were leached out. This was probably due to the shallowness of the layer of soil, the short time-span of the uptake of metals by the plant and the plant's simple root systems.

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“…Shoot lead concentrations of greater than 4% were obtained from Sesbania plants grown in nutrient solution containing 1 g of lead nitrate, and scanning-electron microscopic examination of the exposed plants demonstrated the transport of lead from root to shoot [1]. Heavy metal accumulation by plants is utilized in various phytoremediation strategies for decontamination of the environment [2][3][4][5]. One of the key goals in phytoextraction is to select plants that can translocate substantial amounts of toxic metals from their roots to their aerial parts, which can be easily harvested.…”

Section: Introductionmentioning

confidence: 99%

“…From this standpoint, plant species such as Indian mustard, pea, corn, and wheat have been the focus of lead phytoremediation research. These species accumulate high amounts of lead when grown in contaminated soils, but the specific mechanisms are not well understood [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Chemical speciation and cellular deposition of lead in Sesbania drummondii

Sharma

Gardea‐Torresdey

Parsons

et al. 2004

Enviro Toxic and Chemistry

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The internalized speciation of lead in roots and leaves of Sesbania drummondii, a lead hyperaccumulator, grown in lead nitrate solution was studied using x-ray absorption near-edge structure and extended x-ray absorption fine structure. Lead was predominantly present as lead acetate in both plant tissues. The other dominant forms of accumulation were lead-sulfur compounds. Whereas lead sulfate and sulfide were found in leaves, only lead sulfide was detected in root samples. These observations indicate that S. drummondii is able to biotransform lead nitrate in the nutrient solution to lead acetate and sulfate in its tissues. Complexation with acetate and sulfate may be a lead detoxification strategy in this plant. Transmission-electron microscopy revealed the pattern of lead distribution in and around the cells. Dense distributions of lead grains were detected in root cell walls and plasma membranes, whereas evidence for vacuolar transport of lead was noticed in the stem cells.

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Chelate-Assisted Phytoextraction of Lead from a Contaminated Soil Using Wheat ( Triticum aestivum L.)

Cited by 15 publications

References 0 publications

Lead Accumulation by Tall Fescue (Festuca arundinacea Schreb.) Grown on a Lead-Contaminated Soil

Lead Accumulation by Tall Fescue (Festuca arundinacea Schreb.) Grown on a Lead-Contaminated Soil

Leaching and uptake of heavy metals by ten different species of plants during an EDTA-assisted phytoextraction process

Chemical speciation and cellular deposition of lead in Sesbania drummondii

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