Metal mobilization in soil by two structurally defined polyphenols

Schmidt, Michael A.; Gonzalez, Javier M.; Halvorson, Jonathan J.; Hagerman, Ann

doi:10.1016/j.chemosphere.2012.10.010

Cited by 15 publications

(11 citation statements)

References 40 publications

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“…MTs are also able to bind a variety of trace metals (e.g., Cu and Zn) and to activate antioxidative enzyme defenses (Turchi et al, 2012). Polyphenols and cell wall proteins and pectins are also involved in trace metal chelation and tolerance Schmidt et al, 2013).…”

Section: Root Chelation and Compartmentationmentioning

confidence: 99%

Influence of Soil Chemistry and Plant Physiology in the Phytoremediation of Cu, Mn, and Zn

Pinto

Aguiar

Ferreira

2014

Critical Reviews in Plant Sciences

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Section: Root Chelation and Compartmentationmentioning

confidence: 99%

Influence of Soil Chemistry and Plant Physiology in the Phytoremediation of Cu, Mn, and Zn

Pinto

Aguiar

Ferreira

2014

Critical Reviews in Plant Sciences

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“…However, extractability of these metals by the phenols was less than the Mehlich 3 standard, possibly because of the solubility of the chelated metals. Sorption of the polyphenol to the soil limits its ability to form soluble, extractable complexes with metals, as was previously demonstrated for both Al and Fe ( Schmidt et al, ). The interplay between chelation by polyphenols, which tends to release metals such as Al and Fe, and polyphenol sorption by soils, which tends to retain metals in the soil, has been described by others ( Kaal et al, ).…”

Section: Discussionmentioning

confidence: 88%

“…It has been suggested that an important activity of plant phenols may be mediation of soil properties by changing availability of nutrients in the soil ( Pregitzer et al, ). Our recent studies on the activities of plant phenols in soils including examinations of C/N dynamics ( Halvorson and Gonzalez , ; Halvorson et al, ), ion exchange capacity ( Halvorson et al., ), and micro‐ and macronutrients ( Schmidt et al, ) provide support for that hypothesis. Our work highlights the abilities of natural phenols to mediate soil chemistry and also demonstrates how phenol structure and properties are critical factors in soil activity.…”

Section: Discussionmentioning

confidence: 99%

“…In general, trees and bushes are phenol‐rich compared to grasses and agricultural plants ( Aerts et al, ). Phenolic compounds may confer disease or herbivore resistance ( Barbehenn and Constabel , ), and may serve as signaling molecules above and below ground ( Cesco et al, ), including mediating the soil microbiome ( Schmidt et al, ). In soils, phenols participate in carbon and nitrogen cycling ( Nendel and Reuter , ; Adamczyk et al, ; Smolander et al, ), alter ion exchange properties ( Halvorson et al, ), and influence the distribution of metals ( Kaal et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Soil has higher capacity to sorb large phenolic compounds or nonpolar phenolic compounds than small, polar phenols, and the sorbed phenols are very tightly bound making recovery difficult ( Schmidt et al, ). We compared two tannins and found that Fe and Al were more effectively mobilized by the more polar polyphenol ( Schmidt et al, ). These results led us to hypothesize that the amount of macronutrients and metals extracted from soils by polyphenols is related to the amount of polyphenol that sorbs to the soil.…”

Section: Introductionmentioning

confidence: 99%

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Macronutrients and metals released from soils by solutions of naturally occurring phenols

Schmidt

Halvorson

Hagerman

et al. 2017

J. Plant Nutr. Soil Sci.

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Phenolic compounds produced by plants enter the soil by leaching and litter decomposition. The goal of this work is to determine the effect of phenolic compounds on solubility of plant macronutrients and metals in agroforestry systems. Soils from forest and pasture systems were repeatedly extracted with water (control) or phenolic solutions and then compared to a Mehlich 3 reference. The phenolics were aqueous solutions of tannic acid or β–1,2,3,4,6‐penta‐O‐galloyl‐D‐glucose (PGG) (hydrolyzable tannins), procyanidin (condensed tannin), or small phenolics catechin, gallic acid, or methyl gallate. The concentration of the macronutrients Ca, Mg, K, P, and S, and the metals Fe, Al, Mn, and Zn in the supernatants was determined by inductively‐coupled plasma spectroscopy. Cumulative extraction of macronutrients was generally similar to or less than the amount obtained by the Mehlich 3 extraction with the lowest recoveries obtained with the water control, PGG, and procyanidin. Metals tended to be somewhat more extractable from forest soil, especially with gallic acid, tannic acid or PGG treatments. Three mechanisms affected extraction of analytes by phenol‐containing solutions: (1) pH‐driven dissolution (Ca and Mg), (2) chelation of the metal (Al) by the polyphenol, or (3) reduction of the metal (Fe and Mn). Relatively low extraction of nutrients by some polyphenols is attributed to the tendency of some phenols to sorb to soil. This study demonstrates that tannins and related compounds change the solubility of macronutrients and metals in soils by a complex process that is not easily predictable from simple chemical properties of the phenolics.

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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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Metal mobilization in soil by two structurally defined polyphenols

Cited by 15 publications

References 40 publications

Influence of Soil Chemistry and Plant Physiology in the Phytoremediation of Cu, Mn, and Zn

Influence of Soil Chemistry and Plant Physiology in the Phytoremediation of Cu, Mn, and Zn

Macronutrients and metals released from soils by solutions of naturally occurring phenols

Phytoextraction of Metals: Modeling Root Metal Uptake and Associated Processes

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