Phytoextraction of cadmium-contaminated soil and potential of regenerated tobacco biomass for recovery of cadmium
76
Citation
60
Reference
10
Related Paper
Citation Trend
Abstract:
The aim of this study was to estimate the influence of regenerated tobacco on the extraction of Cd from two acidic soils as well as to address the problem of how to deal with contaminated leaves following phytoextraction. Results showed that a coppicing tobacco led to a decline in Cd concentration in regenerated leaves and stalks when plants were grown in pots, but increased concentrations in regenerated lower and middle leaves when plants were grown under field conditions. The highest recorded bioconcentration factors in Chaling and Guanxi soil were 37.53 and 19.21 in lower leaves in the field, respectively. Total Cd extraction efficiency in practice (9.43% for Chaling soil and 6.24% for Guanxi soil) under field conditions confirmed our theoretical calculations (10.0% for Chaling soil and 6.73% for Guanxi soil). Use of a 0.5% hydrochloric acid(HCl) solution was sufficient to reduce Cd (98.4%) in tobacco leaves to permissible levels as required by the Hygienic Standard for Feeds in China (≤0.5 mg kg-1). Regenerated tobacco has the potential to allow cultivation of Cd contaminated farmland to produce animal feed, assist in lowering total Cd content of soil, and allow income generation for farmers.Keywords:
Bioconcentration
Abstract Mining activity is one main source of heavy metal pollution. In this study, Al, Ba, Be, Ca, Cd, Co, Ce, Cr, Cu, Fe, Ga, Gd, K, La, Li, Mg, Mn, Na, Nb, Nd, Ni, P, Pb, S, Sc, Si, Sr, Ti, V, Y, Zn and Zr were measured by ICP-OES analyzing of the soils taken in the Dehmadan mining area, Chaharmahal and Bakhtiari, Iran. Al, Fe, Cu, Si and Zn were the most frequent metals in the mining area. Phytoremediation is one of the eco-friendly methods to effectively remediate soils contaminated with heavy metals. Consequently, the wild plants were collected from the mining area and subjected to ICP-OES analysis to determine the elements concentrations. A reverse relation was observed between the metals concentrations and vegetation density in the mining area. Finally, the bioconcentration factor (BCF) of the root and shoot, and translocation factor (TF) were determined to assess phytoremediation potential of species. The shoot elements concentrations in combination with BCF and TF greater than 1 were assess to determine hyperaccumulators and plants with excluder potential. Overall, the results showed that BCF in parallel with TF and metals concentrations can advance the knowledge of recognizing hyperaccumulators for phytoremediation of polluted environment.
Bioconcentration
Enrichment factor
Cite
Citations (2)
Bioconcentration
Phytoextraction process
Cite
Citations (82)
Hyalella azteca
Bioconcentration
Cite
Citations (66)
Metal-contaminated soils constitute a serious environmental problem with adverse consequences for human health. This study was conducted to determine phytoextraction efficiency of Echinochloa crus galii for Pb and Cr and the EDTA-assisted (0. 2.5, 5, 10 mmol kg−1) phytoextraction and the potential for leaching of the metals during the phytoextraction process. The results revealed that the bioconcentration factors of roots of the plant were relatively higher than the bioconcentration factors of the shoot. Thus, the plant species of E. crus galii would be applicable for Pb and Cr phytostabilization. Addition of EDTA had virtually a significant effect on uptake of the metals by the plant and elevated Pb and Cr concentrations in plant organs as compared with the control. Optimum phytoextraction was observed when 5 mmol kg−1 EDTA was added in a single dosage 60 days after the plant cultivation and consequently soil Pb and Cr concentration decreased with the passage of time.
Bioconcentration
Cite
Citations (11)
Bioconcentration
Transfer factor
Typha
Cite
Citations (5)
Phytoremediation has been regarded as a suitable technique for the pollution control of Ni contaminated soils. In this paper two methods of efficient improvement of phytoextraction are discussed: first, to improve the uptake of Ni by plants by increasing Ni concentration in soil solution; second, to adopt some means based on physiological mechanism of heavy metal hyperaccumulators.
Phytoextraction process
Cite
Citations (0)
Abstract The effectiveness of using Vetiver grass ( Chrysopogon zizanioides ) in phytoremediation of wastewater has been proven. In this study, the phytoremediation potential of C. zizanioides planted in Cr- and Ni-contaminated soil was evaluated through investigating the behaviors on uptake and release of metals. Three treatments: control, Cr, and Ni, with three concentrations (50, 150, and 300 ppm), were applied. The potential of C. zizanioides is assessed by the determination of metal uptake rate, metal release rate, bioconcentration factor (BCF), biological absorption coefficient (BAC), and translocation factor (TF). The experiment showed that Cr uptake was higher than release rate and on the other hand low in uptake and release of Ni. Accumulation of Cr and Ni was 167.8 mg kg −1 and 66.3 mg kg −1 , respectively. Excess of Cr in the soil was absorbed in high uptake rate making vetiver grass suitable for Cr phytoremediation. During 28-day uptake and 28-day release periods, it was found that BCF, BAC, and TF values in some treatments showed greater than 1 (one) and Ni-treated plants were able to translocate Ni to aerial plant parts supported by its high TF value. Low acidity of soil causes low solubility and low mobility of metals, resulting in low metal absorption. C. zizanioides has shown the potential as a heavy metal-tolerant species and could be potentially used as phytoremediation alternative species at least in lightly polluted areas.
Bioconcentration
Cite
Citations (18)
In this study, four cadmium treatments (control, 5, 10 and 20 ppm) were added to the soil and the fast-growing plant Mentha spicata was investigated to assess phytoremediation. The results showed that cadmium absorbed by the root of the plant is different in various cadmium treatments and have significant difference in 0.01 levels. But the amount transmitted to the leaves is insignificant. There is a significant difference in treatments at different levels of pollution that is the amount of cadmium transmitted to the leaves has been increased as cadmium density in soil grows. Bioconcentration factor of the root in the controltreatment, 5, 10 and 20 ppm were obtained 57. 66,19.46, 49.80, 23.38 ppm and the bioconcentration factor of the leaf 0.76, 1.20, 1.63, 9.00 ppm in order. Considering the results of bioconcentration factors of the root and leaf in Mentha spicata which is above 1, this plant can be put among the ones which is able to extract cadmium. Uptake index in the control treatment,5, 10 and 20ppm were obtained1.17,5.40,10.15 and 13.16in order. This coefficient can be used as a relative criterion to calculate refinement potential of metal elements. It can be inferred that uptake index has been increased as cadmium density grows based on the results. This shows that the plant is more able to extract cadmium from the soil.
Bioconcentration
Mentha spicata
Cite
Citations (1)
Bioconcentration
Ethylenediaminetetraacetic acid
Tagetes
Cite
Citations (33)