Modeling the plant–soil interaction in presence of heavy metal pollution and acidity variations

Guala, Sebastián; Vega, F.A.; Covelo, Emma F.

doi:10.1007/s10661-012-2534-z

Cited by 24 publications

(18 citation statements)

References 41 publications

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“…It is important to assess the bioavailability of metals and thus to distinguish between the total and available metal concentration (van Leeuwen 1999; Guala et al 2010bGuala et al , 2013. The free metal ion activity in solution may explain the metal uptake and toxicity to a greater degree than the total soil metal concentration (Sauvé et al 1998).…”

Section: Metal Bioavailability and Root Uptakementioning

confidence: 99%

“…The relationship between the metal in the soil and the total content of the metal in plants is highlighted by Guala et al (2011). Additional modifications to the abovementioned models have been performed by Guala et al (2013) and involve changes in the concentrations of metals in the biomass and the accumulation curves of metals in plants as a function of pH. The model relates the dynamics of metal uptake from soil by plants, considering the critical concentration level, the plant resistance, and the accumulation capacity, for the effective design of phytoextraction strategies.…”

Section: Effects Of Metal Uptake On Plant Growthmentioning

confidence: 99%

“…In general, the prediction provides information about the effects of different metals on plants, depending on various soil characteristics and the plant species. Thus, the model can be applied to different plants to understand how different levels of metals present in the soil can influence plant growth (Guala et al 2010a(Guala et al , b, 2011(Guala et al , 2013. A multielement uptake model was developed to study the accumulation and toxicity of Cu to pea (Pisum sativum L.) roots using Visual MINTEQ (Gustafsson 2006(Gustafsson , 2011.…”

Section: Effects Of Metal Uptake On Plant Growthmentioning

confidence: 99%

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Phytoextraction of Metals: Modeling Root Metal Uptake and Associated Processes

et al. 2014

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IntroductionPhytoextraction is a process which can remove the soluble (bioavailable) metal pool from soil or aqueous solutions using different kinds of terrestrial or aquatic plants. This transport may be divided into three different steps: (1) absorption from the solution (e.g., soil solution), (2) transport to the root xylem, and (3) transport to the shoots (Mench et al. 2009).A modern approach, how to evaluate the extraction potential of selected plants as well as how to plan and design the most effective metal phytoextraction, is the ability to relevantly model this process. There are many studies aimed at the modeling of metal transport. Nevertheless, there is a limited amount of present studies, which are focused on the modeling of the phytoremediation process. In general, developing an applicable model requires sufficient conceptual model description and a fundamental theoretical understanding of the studied system, as well as its experimental equipment and measurement; these are all crucial aspects required to create a relevant simulation of studied problem. This chapter attempts to describe the problems associated with metal phytoextraction modeling. The term "root metal uptake" is crucial for the simulation of phytoremediation of metals, which is a concrete modification of the general term "root uptake." Root uptake is one of the most important processes considered in numerical models because root surfaces represent the first-phase boundaries in nature for nutrients and toxic elements. In order to efficiently model the phytoextraction processes, it is essential to provide information about (1) the spatiotemporal concentration changes of metals in the root-influenced soil and (2) the cumulative uptake of metals per unit length of root over time (Darrah et al. 2006). Root UptakeDetermining water and metal uptake by plant roots and their subsequent translocation into the tissues of the aerial parts is obviously critical for assessing the modeling of phytoremediation options. Because metals are taken up by plants dissolved in water, it is crucial to have information about the transport of water and the hydraulic properties of the roots. Root Water UptakeWater is primarily absorbed by the root hairs and other root zones and then transported to the aerial parts in xylem tissues. Water absorption by the plants is mainly a response to the water potential gradient (from low to high energy) from the rhizosphere to the xylem of the roots. Soil water has a lower total solute concentration than plant water, and hence the osmotic gradient tends to drive water from the soil into the root. The rate of water uptake from the soil depends on rooting density, the hydraulic conductivity of the roots, and the difference between average soil-water suction and root suction. The root hydraulic conductivity is a measure of the amount of water transported by the root in an interval of time at a determinate pressure [mg g et al. 1987). It depends on osmotic potential gradients which result from differences in the composition and t...

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Section: Metal Bioavailability and Root Uptakementioning

confidence: 99%

Section: Effects Of Metal Uptake On Plant Growthmentioning

confidence: 99%

Section: Effects Of Metal Uptake On Plant Growthmentioning

confidence: 99%

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Phytoextraction of Metals: Modeling Root Metal Uptake and Associated Processes

et al. 2014

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“…12 has a pH of 5.26 in 1 M KCl and 6.25 in H2O, showing a slightly acidic character of the soil. Heavy metals in soils with acidic character could be a risk to the plants [10]. All soil samples are of poor salinity.…”

Section: Resultsmentioning

confidence: 99%

Pollution of soils (Pb, Cd, Cr, Zn, Cu, Ni) along the ring road of Wrocław (Poland)

Hołtra

Zamorska-Wojdyła

2017

E3S Web Conf.

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Abstract. The concentrations of metallic pollution in soils and plants along the ring road of Wrocław, Poland, have been determined. Environmental samples were collected from the surface layer of the profile within 2-3 m from the edge of the road. The analysis of metals (Pb, Cd, Cr, Zn, Cu and Ni) has been carried out through FAAS and GFAAS methods. The mineralizates of soils and plants were prepared in HNO3, 65% supra pure, using the Microwave Digestion System. The pH and conductivity of the soil solutions were measured to evaluate their active and exchangeable acidity and the salinity of the soils. The index of the enrichment of soils in metals (Wn) and the bioaccumulation coefficient (WB) have been determined. Also, histograms of the frequency of the occurrence of metals in the environmental samples and the Pearson's correlation coefficients were presented. The results of metal concentrations in soils were compared to the geochemical background in uncontaminated soils of Poland. The assessment of the results in the soils was also made relative to the standard, according to the Polish Ministry of Environment Regulation from September 1 st , 2016. During the assessment of the bioaccumulation coefficients of metals in plants a reference was made to the content of undesirable substances in feed in agreement with the Polish

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“…These approaches and other mathematical expressions have been employed in an attempt to relate TEs solubility with their subsequent transfer from soil to plants as an environmental risk assessment of contaminated soils [12,15]. However, the application of these useful tools to assess the suitability of a particular soil/tailing treatment for its remediation is scarce.…”

Section: Acc E P Ted P R E P R I Ntmentioning

confidence: 99%

Alleviation of environmental risks associated with severely contaminated mine tailings using amendments: Modeling of trace element speciation, solubility, and plant accumulation

Pardo

Bes²,

Bernal³

et al. 2016

Enviro Toxic and Chemistry

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Tailings are considered one of the most relevant sources of contamination associated with mining activities. Phytostabilization of mine spoils may need the application of the adequate combination of amendments to facilitate plant establishment and reduce their environmental impact. Two pot experiments were set up to assess the capability of 2 inorganic materials (calcium carbonate and a red mud derivate, ViroBind ), alone or in combination with organic amendments, for the stabilization of highly acidic trace element-contaminated mine tailings using Atriplex halimus. The effects of the treatments on tailings and porewater physico-chemical properties and trace-element accumulation by the plants, as well as the processes governing trace elements speciation and solubility in soil solution and their bioavailability were modeled. The application of the amendments increased tailings pH and decreased (>99%) trace elements solubility in porewater, but also changed the speciation of soluble Cd, Cu, and Pb. All the treatments made A. halimus growth in the tailings possible; organic amendments increased plant biomass and nutritional status, and reduced trace-element accumulation in the plants. Tailings amendments modified trace-element speciation in porewater (favoring the formation of chlorides and/or organo-metallic forms) and their solubility and plant uptake, which were found to be mainly governed by tailing/porewater pH, electrical conductivity, and organic carbon content, as well as soluble/available trace-element concentrations. Environ Toxicol Chem 2016;35:2874-2884. © 2016 SETAC.

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Modeling the plant–soil interaction in presence of heavy metal pollution and acidity variations

Cited by 24 publications

References 41 publications

Phytoextraction of Metals: Modeling Root Metal Uptake and Associated Processes

Phytoextraction of Metals: Modeling Root Metal Uptake and Associated Processes

Pollution of soils (Pb, Cd, Cr, Zn, Cu, Ni) along the ring road of Wrocław (Poland)

Alleviation of environmental risks associated with severely contaminated mine tailings using amendments: Modeling of trace element speciation, solubility, and plant accumulation

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