Enhanced phytoextraction of Pb and other metals from artificially contaminated soils through the combined application of EDTA and EDDS

Luo, Chunling; Shen, Zhenguo; Li, Xiangdong; Baker, A. J. M.

doi:10.1007/bf02840234

Cited by 9 publications

(12 citation statements)

References 21 publications

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“…Vetiver grass did not show any apparent changes with respect to growth parameters in the presence of chelants at varying concentrations. Conversely, the application of chelants for phytoextraction of Pb showed toxic effects on plant growth and metabolism, as shown in the literature 22, 24, 25. EDTA and EDDS application at 5 mmol kg −1 soil having 2500 mg Pb kg −1 soil was toxic to corn and beans, resulting in chlorosis and necrosis of plants by 14 days (d) after the chelant application 22.…”

Section: Resultsmentioning

confidence: 84%

Chelant‐assisted Phytostabilization of Paint‐contaminated Residential Sites

Andra

Sarkar

Saminathan

et al. 2010

CLEAN Soil Air Water

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Following the basic incubation study, a greenhouse experiment was conducted to elucidate the efficiency of vetiver grass (Vetiveria zizanioides L.), with or without chelating agents, in remediating lead (Pb)-contaminated soils from actual residential sites where Pb-based paints were used. Because the primary factor affecting Pb phytoavailability in soils is soil pH, we used two soil types widely varying in pH that have total Pb concentrations above 1500 mg kg À1 soil. Lead-contaminated, low pH, acidic soils were collected from residential sites in Baltimore, MD and high pH, alkaline soils were collected from residential sites in San Antonio, TX. Based on the soil characterization results, two most appropriate soils (one from each city, having similar Pb levels but variable soil physico-chemical properties) were selected for this study. Ethylenediaminetetraacetic acid (EDTA) and [S,S 0 ]ethylenediaminedisuccinate (EDDS)were applied at 5, 10, and 15 mmol kg À1 soil. Lead uptake and translocation in vetiver was determined on day 10 after chelants addition. Plant and soil analysis show that EDTA treated soils have maximum Pb uptake and lower total soil Pb levels. Prediction models developed for exchangeable Pb show a strong correlation for total Pb accumulated in vetiver grass. Results of the sequential chemical extraction of the soils at both initial and final time-points, indicates a significant mobilization of Pb by the two chelants from carbonate-bound fraction to exchangeable pool. Information on physico-chemical properties of contaminated residential soils help in predicting Pb phytoextraction and thus further help in calibrating a successful chelant-assisted phytoremediation model.

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Section: Resultsmentioning

confidence: 84%

Chelant‐assisted Phytostabilization of Paint‐contaminated Residential Sites

Andra

Sarkar

Saminathan

et al. 2010

CLEAN Soil Air Water

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“…The chelant can be applied to the soil matrix either in a single dose after the optimum growth of the accumulator crop, or in small multiple doses gradually during the growth cycle. Luo et al (2006) also found that the combined application of EDTA and EDDS results in a higher level of efficiency in the phytoextraction of Cu, Pb, Zn, and Cd than could be obtained by the application of either chelant alone. Phytoextraction efficiency can also be improved by the combined application of different chelants to the metal-contaminated soil .…”

Section: Phytoextractionmentioning

confidence: 83%

Environmental Remediation Technologies for Metal-Contaminated Soils

Hasegawa¹,

Rahman²,

Rahman³

2016

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“…After adsorption experiments the aliquots were filtered on 0.45 μm cellulose ester membranes, and residual Pb(II) concentration was determined by atomic absorption spectrophotometry (AAS, Varian AA Spectra, 55 Australia) with absorbance measured at wavelength of 283.3 nm. With the residual Pb(II) concentration present in solution, it was possible to calculate lead removal efficiency (%) and the amount of biosorbed Pb by biosorbent mass (Q e , mg/g), according to Equations (1) and (2).…”

Section: Adsorption Studiesmentioning

confidence: 99%

“…Environment contamination by toxic metals is a result of a wide range of activities . However, in general, inadequate disposal of industrial effluents has significantly contributed to water resources contamination by toxic metals, which in turn are recognized as highly hazardous contaminants due to their high toxicity and accumulation in the environment …”

Section: Introductionmentioning

confidence: 99%

Analysis of the influence of natural adsorbent functionalization (Moringa oleifera) for Pb(II) removal from contaminated water

Tavares

Pinto

Vicentini

et al. 2019

Env Prog and Sustain Energy

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Due to lead (Pb) being highly toxic and harmful to living beings, several techniques have been studied aiming at its removal from contaminated water, with great emphasis on the adsorption process. In this sense, the objective of this study was to investigate if the chemical functionalization in biosorbents of Moringa oleifera pods promotes greater potential in the process of removing lead from aqueous solution. To this end, characterization of biomass was performed by energy dispersive X‐ray spectroscopy, Fourier transform infrared spectroscopy analysis, scanning electron microscopy, X‐ray diffraction, and zero load point. Additionally, the parameters that influence the efficiency of lead biosorption have been investigated. From the studied parameters, the optimal conditions obtained for both analyzed biosorbents are as follows: 30 min to equilibrium, pH 6 and 25°C temperature. Biosorption studies revealed kinetic modeling of data were better represented by the pseudo‐second model. In relation to adsorption isotherms, the model that best fit the experimental data were the Langmuir model for both biosorbents. When comparing the biosorbents studied, it was concluded that chemical functionalization carried out using basic treatment agent was the most efficient in removing lead ions (II), and the maximum adsorption capacity obtained was 38.52 mg/g.

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Enhanced phytoextraction of Pb and other metals from artificially contaminated soils through the combined application of EDTA and EDDS

Cited by 9 publications

References 21 publications

Chelant‐assisted Phytostabilization of Paint‐contaminated Residential Sites

Chelant‐assisted Phytostabilization of Paint‐contaminated Residential Sites

Environmental Remediation Technologies for Metal-Contaminated Soils

Analysis of the influence of natural adsorbent functionalization (Moringa oleifera) for Pb(II) removal from contaminated water

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