Influence of electrical fields (AC and DC) on phytoremediation of metal polluted soils with rapeseed (Brassica napus) and tobacco (Nicotiana tabacum)

Bi, Ran; Schlaak, M.; Siefert, Eike; Lord, Richard; Connolly, Helen E

doi:10.1016/j.chemosphere.2010.12.052

Cited by 109 publications

(40 citation statements)

References 33 publications

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“…Table 2 represented values of shoots dry weight of H. annuus. Bi et al (2011), by the application of DC electrical fields in soil, have also reported that the application of electrical field did not affect the plant biomass significantly; However, the application of chelating agents had significant effect on the root dry weight of sunflower (p \ 0.05). EDTA compared with CME and PME decreased root dry weight of plant significantly.…”

Section: Resultsmentioning

confidence: 99%

“…The plants were harvested by cutting the stem 1 cm above the soil surface carefully. The harvested plants (shoot and root) were washed with 0.1 M HCl, rinsed with de-ionized water, and then dried in the oven at 75°C for 48 h (Lim et al 2004;Bi et al 2011). Then the dried shoots and roots were weighted and milled into fine powder using a grinding machine and stored in glass containers until analysis.…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, combination of electrokinetic remediation and phytoremediation to decontaminate metal-polluted soil has attracted many researches (O'Connor et al 2003;Lim et al 2004;Cang et al 2011;Bi et al 2011). However, there was no study on the effects of choosing a plant as cathode in electrokinetic phytoremediation.…”

Section: Introductionmentioning

confidence: 99%

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Chelate-assisted phytoextraction of cadmium from a mine soil by negatively charged sunflower

Tahmasbian

Sinegani

2013

Int. J. Environ. Sci. Technol.

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The effects of some chelating agents and electricity on cadmium phytoextraction from a mine soil were examined in pot culture of sunflower to achieve more remediation efficiency. At the beginning of the flowering stage, ethylene-diamine-tetra-acetic acid (EDTA) as a chemical chelator, cow manure extract (CME) and poultry manure extract (PME) as organic chelators were applied (2 g kg -1 soil) during irrigation. Seven days later, Helianthus annuus was negatively charged by inserting a stainless steel needle in the lowest part of the stem with 10 and 30 V direct current electricity for 1 h each day for 14 days. Afterward, concentration of cadmium in roots and shoots, cadmium translocation factor (TF), cadmium uptake index (UI) and soil available (diethylene-triaminepenta-acetic acid extractable) cadmium were measured. Results indicated that EDTA reduced roots dry weight while none of the roots and shoots was affected by other chelating agents and by electrical treatment as well. Highest concentration of cadmium in shoots was measured in 10 V-control with no significant differences with 30 V-PME and 30 V-EDTA. Utilization of chelating agents did not increase the cadmium TF and cadmium UI while highest values for cadmium TF and cadmium UI were observed in 10 and 30 V treatments, respectively. Available cadmium in the soil near root system treated with 10 and 30 V was relatively lower compared with the soil far from root system. Results of this experiment indicated that charging the plant with direct current electricity ameliorated the efficiency of cadmium phytoremediation.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Chelate-assisted phytoextraction of cadmium from a mine soil by negatively charged sunflower

Tahmasbian

Sinegani

2013

Int. J. Environ. Sci. Technol.

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“…This technique saves tremendous remediation costs by accumulating low levels of contamination from a widespread area to an easily severable medium. Plants that are promising for phyto-extraction include the mustard plant and some varieties of broccoli and cabbage, which have the required tissue mass to absorb large quantities of metal, tend to pull the metal up into their shoots, and grow relatively quickly (Nakamura et al 2008 ;Bi et al 2011 ). Nickel and zinc appear to be most easily absorbed, although preliminary results for copper and cadmium are encouraging.…”

Section: Phytoextractionmentioning

confidence: 92%

Phytoremediation, Transgenic Plants and Microbes

Behera

2013

Sustainable Agriculture Reviews

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Phytoremediation is a promising technology using plants and microbes to clean up contaminated air, soil, and water. Pollutants pose a global threat for agricultural production, productivity, wildlife and human health. Environmental pollution increasing in many parts of the world. Many methods of preventing, removing and or correcting the negative effects of pollutants exist but their application has either been poorly implemented or not at all. For phytoremediation selected or engineered plants and microbes are used to treat effi ciently low to moderate levels of contamination.Phytoremediation uses the age-long abilities of selected plants and microbes to remove pollutants from the environment. Phytoremediation will probably become a commercially available technology in many parts of the world including India. Currently $6-8 billion a year is spent on environmental cleanup in the US. In the United Kingdom £4 million are spent on air pollution control and £1.5 million on water-treatment plant, and this cost is expected to increase by 50 % over the next 5 years. The cost of phytoremediation has been estimated as $25-$100 per ton of soil, and $0.60-$6.00 per 1,000 gallons of polluted water, with remediation of organics being cheaper than remediation of metals. Phytoremediation also offers a permanent in situ remediation rather than simply translocating the problem. This review focuses on the major concerns such as phytoremediation technologies, plant and microbes in phytoremediation and, ecological considerations of phytoremediation.

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“…The other process caused by applied electrical potential is known as electroosmosis, i.e., the movement of an ionic liquid under the action of an applied electric field through semipermeable membrane relative to a charged surface (Giannis et al 2007). In recent years, the combination of electrokinetic remediation and phytoremediation to decontaminate metal-polluted soil has attracted many researches (Lim et al 2004;Zhou et al 2007;Cang et al 2011;Bi et al 2011).…”

Section: Electrokinetic and Phytoextractionmentioning

confidence: 99%

Chelating Agents and Heavy Metal Phytoextraction

2015

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Elements with density higher than 5 g cm À3 have been called heavy metals. From the metallic elements that naturally exist, 53 elements belong to the heavy metal group. Some of these heavy metals, such as iron, manganese, copper, zinc, and molybdenum, are known as micronutrients in agriculture, since their amount in soil is low and the little quantity of them is necessary for plant growth. Another group of these elements, such as cobalt and vanadium, has been shown to be useful for plant growth. The other category, such as nickel, chromium, selenium, lead, and cadmium, has toxic effects on plant and other organisms even in low level. The mobility and uptake of these elements and the appearing of their negative effect in the environment depend on soil, water, and plant relations.The term "chelating agents" refers to ligands occupying multiple positions in the inner coordination of a metal ion. Heavy metals combine with one or more reactive groups or ligands like oxygen (-OH, -COO, -POO), nitrogen (-NH 2 , -NH), or sulfur (-SH, -S-S). The result of this phenomenon is the formation of soluble multidentate metal-chelant complexes called "chelates" (Fig. 20.1) which came from a Greek word "chele" meaning the claw of a crab or scorpion (Tsang et al. 2012).To know the increase of metal solubility in soil, it is important to figure out the metal ion-ligand interactions. The complex formation can be considered as equilibrium reaction between the ligand and the metal ion:

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Influence of electrical fields (AC and DC) on phytoremediation of metal polluted soils with rapeseed (Brassica napus) and tobacco (Nicotiana tabacum)

Cited by 109 publications

References 33 publications

Chelate-assisted phytoextraction of cadmium from a mine soil by negatively charged sunflower

Chelate-assisted phytoextraction of cadmium from a mine soil by negatively charged sunflower

Phytoremediation, Transgenic Plants and Microbes

Chelating Agents and Heavy Metal Phytoextraction

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