Citric Acid-Assisted Phytoextraction of Lead in the Field: The Use of Soil Amendments

Freitas, Eriberto Vagner de Souza; Nascimento, Clístenes Williams Araújo do; Silva, Wildson Morais

doi:10.1007/s11270-013-1796-6

Cited by 16 publications

(4 citation statements)

References 35 publications

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“…Also, in other species like Helianthus annuus or Brassica juncea , EDTA significantly increased the translocation of metals within the plants (Hsiao et al 2007 ; Turgut et al 2004 ). In general, the extraction of metals from the soil into the plant in phytoremediation is also greatly improved by the addition of chelating agents (Freitas et al 2014 ), taking also advantage of the fact that chelators have a high affinity to many different metals (Nowack and VanBriesen 2005 ). Therefore, chelators minimize the amount of free Ni ions (Table 1 ) but this is not relevant for metal uptake and translocation within the plant.…”

Section: Discussionmentioning

confidence: 99%

Ni tolerance and its distinguished amelioration by chelating agents is reflected in root radius of B. napus cultivars

et al. 2018

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The negative effect of excess nickel (Ni) on plants is well investigated but there is only little information on its influence on root anatomy and a possible amelioration by chelating agents. In this study, we utilized light microscopy to observe anatomical changes in canola (Brassica napus) roots and investigated the element content by X-ray microanalysis. Ni-tolerant (Con-II) and Ni-sensitive cultivars (Oscar) were selected for this purpose. The plants were treated with 30 ppm NiSO 4 . Then, citric acid and ethylene-diamine-tetra-acetic acid (EDTA) (alone or in combination) were applied to observe the influence of chelating agents in metal stress amelioration. Ni treatment led to significant swelling of the roots in the Con-II variety as compared to the cultivar Oscar. Application of EDTA reduced the root radius of Con-II plants and this effect for Ni tolerance is discussed. According to Xray microanalyses, Ni ions were more dispersed in the sensitive cultivar as indicated by metal adsorption to the cell wall. We investigate the hypothesis that an enhanced capacity of binding metals to the cell wall allows the plants to tolerate more heavy metals.

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Section: Discussionmentioning

confidence: 99%

Ni tolerance and its distinguished amelioration by chelating agents is reflected in root radius of B. napus cultivars

et al. 2018

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“…Plants were thoroughly washed with running water, followed by distilled water, and then dried at 105 °C for 1 h, and then at 65 °C in an oven (BGZ-30, Shanghai Boxun Industry and Commerce Company, Shanghai, China) until completely dry. They were finally weighed, and the dry weight of the plants was recorded [ 20 ]. The soil was air-dried, crumbled and then milled (2 mm).…”

Section: Methodsmentioning

confidence: 99%

Influence of Nano-Hydroxyapatite on the Metal Bioavailability, Plant Metal Accumulation and Root Exudates of Ryegrass for Phytoremediation in Lead-Polluted Soil

Ding

Liu

et al. 2017

IJERPH

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Lead is recognized as one of the most widespread toxic metal contaminants and pervasive environmental health concerns in the environment. In this paper, the effects of nano-hydroxyapatite (NHAP) on remediation in artificially Pb-contaminated soils and ryegrass were studied in a pot experiment. The addition of NHAP decreased the water- and acid-soluble, exchangeable, and reducible fractions of Pb, extracted using the Community Bureau of Reference (BCR) method, whilst greatly increasing the residual fraction of Pb. Oxidizable Pb was increased slightly. No significant increase in soil pH was caused by the application of NHAP. Compared to conditions without NHAP, the addition of NHAP decreased the Pb content in ryegrass shoots and roots by 13.19–20.3% and 2.86–21.1%, respectively. Therefore, the application of NHAP reduced the mobility and bioavailability of Pb in the soil. In addition, the application of NHAP improved the fresh weight of shoots and roots, and promoted the growth of ryegrass. NHAP played a positive role in stimulating ryegrass to secrete tartaric acid.

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“…The main bottlenecks that hinder the further development of phytoremediation are the low efficiency of metal removed per unit of land and prohibitively long clean-up times (Evangelou, Conesa, Robinson, & Schulin, 2012;Freitas, Nascimento, & Silva, 2014;Silva et al, 2017). Given such limitations have not yet been overcame, phytomanagement was developed as an alternative approach.…”

Section: Introductionmentioning

confidence: 99%

Using plants to remediate or manage metal-polluted soils: an overview on the current state of phytotechnologies

et al. 2021

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Soil contamination by metals threatens both the environment and human health and hence requires remedial actions. The conventional approach of removing polluted soils and replacing them with clean soils (excavation) is very costly for low-value sites and not feasible on a large scale. In this scenario, phytoremediation emerged as a promising cost-effective and environmentally-friendly technology to render metals less bioavailable (phytostabilization) or clean up metal-polluted soils (phytoextraction). Phytostabilization has demonstrable successes in mining sites and brownfields. On the other hand, phytoextraction still has few examples of successful applications. Either by using hyperaccumulating plants or high biomass plants induced to accumulate metals through chelator addition to the soil, major phytoextraction bottlenecks remain, mainly the extended time frame to remediation and lack of revenue from the land during the process. Due to these drawbacks, phytomanagement has been proposed to provide economic, environmental, and social benefits until the contaminated site returns to productive usage. Here, we review the evolution, promises, and limitations of these phytotechnologies. Despite the lack of commercial phytoextraction operations, there have been significant advances in understanding phytotechnologies' main constraints. Further investigation on new plant species, especially in the tropics, and soil amendments can potentially provide the basis to transform phytoextraction into an operational metal clean-up technology in the future. However, at the current state of the art, phytotechnology is moving the focus from remediation technologies to pollution attenuation and palliative cares.

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Citric Acid-Assisted Phytoextraction of Lead in the Field: The Use of Soil Amendments

Cited by 16 publications

References 35 publications

Ni tolerance and its distinguished amelioration by chelating agents is reflected in root radius of B. napus cultivars

Ni tolerance and its distinguished amelioration by chelating agents is reflected in root radius of B. napus cultivars

Influence of Nano-Hydroxyapatite on the Metal Bioavailability, Plant Metal Accumulation and Root Exudates of Ryegrass for Phytoremediation in Lead-Polluted Soil

Using plants to remediate or manage metal-polluted soils: an overview on the current state of phytotechnologies

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