Hydroponic Study of Aluminum Accumulation by Aquatic Plants: Effects of Fluoride and pH

Gallon, Céline; Munger, Catherine; Prémont, Stéfane; Campbell, Peter G. C.

doi:10.1023/b:wate.0000019943.67578.ed

Cited by 39 publications

(25 citation statements)

References 24 publications

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“…4). However, most authors agree that within labile Al, the most toxic species are Al 3+ and Al-OH complexes, while Al-F and Al-SO 4 are much less toxic (Kinraide 1997;Kochian 1995;Gallon et al 2004). Considering 17 μmolL −1 as the limiting concentration for the sum of Al 3+ and Al-OH, rather than AlL, the risk of Al toxicity will only exist in the C. vulgaris rhizosphere in the slope and in the external rhizosphere of E. cinerea in the dump.…”

Section: Aluminum Phytotoxicitymentioning

confidence: 97%

“…Speciation of Al in the soil solution is important because this determines the toxicity of Al to plants so that the bioavailability and biotoxicity of aluminum compounds in the soil solution is closely related to the species present (Kubová et al 2005;Scancar and Milacic 2006). It is generally thought that Al 3+ and monomeric hydroxyaluminum complexes are the most toxic Al species (Kochian 1995;Kinraide 1997;Gallon et al 2004), while soluble organo-Al, Al-F, and Al-SO 4 complexes are less phytotoxic (Stevens et al 1997;Feng 2000). In natural soils of Galicia, most of the Al in the soil solution is bound to organic matter in the form of polymers or monomers, or forms complexes with F (Álvarez et al 1992, 2002, 2005), and is of low toxicity (Buodot et al 1994;Kinraide 1997;.…”

mentioning

confidence: 98%

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Aluminum speciation in the bulk and rhizospheric soil solution of the species colonizing an abandoned copper mine in Galicia (NW Spain)

et al. 2010

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Purpose The present study was carried out to identify and quantify the aluminum species present in the bulk and rhizospheric soil solution of the spontaneous vegetation colonizing the dump (Calluna vulgaris, Erica cinerea) and slope (C. vulgaris, E. cinerea, Salix atrocinerea) of an abandoned Cu mine in Touro (Galicia, NW Spain). Materials and methods Total dissolved aluminum was speciated into reactive Al (Alr) and acid-soluble Al (Alsa). Acid-soluble aluminum comprises colloids, polymers and/or organo-aluminum complexes, whereas Alr comprises nonlabile monomeric aluminum (AlnL) and labile monomeric aluminum (AlL). The latter fraction included Al 3+ , Al-OH complexes, Al-F complexes, and Al-SO 4 complexes. Results and discussionThe results show that Ericaceae modified the pH of the rhizosphere from 6.6 to 4.0 (C. vulgaris) in the slope, whereas S. atrocinerea only grew in close-to-neutral soil conditions and increased the rhizosphere pH by 0.8 units. The total concentration of Al in the soil solution was low (<75 μmolL -1 ) and was higher in the rhizosphere than in the bulk soil solution in all samples. Under Ericaceae, the Alr represented between 80% and 98% of the total Al in solution and the concentration was higher in the rhizosphere; under S. atrocinerea the Alsa was always higher than 80%, with higher concentrations in the rhizosphere. AlL predominated over AlnL in all samples. The distribution of labile Al into different species depended on the pH and the concentration of labile Al: Al 3+ predominated in all samples from the dump (>40% of the AlL) and in the C. vulgaris rhizosphere in the slope (>52% of the AlL); the Al-F complexes were more abundant in the E. cinerea rhizosphere in the slope (>40% of the AlL), and Al-OH complexes predominated in all samples associated with S. atrocinerea (>70%). In the mine dump, the Ca/AlL ratio changed from 0.07 (bulk soil) to higher than 1.4 in the root zone of the Ericaceae thus decreasing the risk of toxicity by this element. Conclusions Labile aluminum is the prevailing fraction in all dump samples and in the rhizosphere of Ericaceae growing on the slope. Al 3+ is the predominant species in the most acidic samples with the highest concentration of labile Al and the highest AlL/F ratio. In areas where there may be a risk of Al toxicity, Ericaceae accumulated Ca in the vicinity of the roots, thus increasing the Ca/AlL ratio relative to that in the bulk soil and preventing absorption of Al and the associated phytotoxicity.

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Section: Aluminum Phytotoxicitymentioning

confidence: 97%

mentioning

confidence: 98%

Aluminum speciation in the bulk and rhizospheric soil solution of the species colonizing an abandoned copper mine in Galicia (NW Spain)

et al. 2010

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“…These results appear to indicate that organic complexation of the aluminium in highly stable complexes close to the roots is a mechanism that prevents absorption of aluminium by the plant and thus its toxic effects. In this sense, some authors consider that one of the principal mechanisms of plant tolerance to Al consists of the exclusion of Al by root exudates (Barceló and Poschenrieder 2002;Gallon et al 2004;Wang et al 2006). Organoaluminium complexes are also scarce in the bulk soil and in the rhizosphere of S. atrocinerea, in which the pH is higher and organic matter is scarce.…”

Section: Fractions Of Al In the Soil Solid Phasementioning

confidence: 98%

Aluminium geochemistry in the bulk and rhizospheric soil of the species colonising an abandoned copper mine in Galicia (NW Spain)

et al. 2010

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Purpose Aluminium partitioning in the solid fraction and aluminium in solution in the bulk and rhizospheric soil of different plant species colonising an abandoned Cu mine slope (Calluna vulgaris, Erica cinerea and Salix atrocinerea) and mine dump (C. vulgaris and E. cinerea) were investigated. The aim of the study was to determine the changes that the species induce in the Al forms in the rhizosphere in order to adapt to heterogeneous substrates. Materials and methods Al was extracted from the solid phase with different solutions: ammonium oxalate (Alo), sodium pyrophosphate (Alp), copper chloride (Alcu), lanthanum chloride (Alla) and ammonium chloride (AlNH 4 ). The following Al fractions were obtained: inorganic non-crystalline Al (Alop=Alo-Alp), highly stable organoaluminium complexes (Alpcu=Alp-Alcu), organoaluminium complexes of intermediate stability (Alcula= Alcu-Alla) and labile organoaluminium complexes (Alla). The concentration of Al present in the aqueous phase was also determined. Results and discussion The pH of the soil in the mine slope was close to 7, and the roots of Ericaceae caused strong acidification so that the pH of the rhizospheric soil was low (3.6-4.7). In contrast, the pH of the bulk and the rhizospheric soil of S. atrocinerea remained close to 7. In the mine dump (pH3.7), the changes in the pH of the Ericaceae rhizosphere in relation to the bulk soil were not as marked as in the mine slope. Alop predominated in the solid phase (more than 70% of the Alo), and Alpcu predominated in the organoaluminium complexes (more than 55%), followed by Alcula (13% and 47%) and Alla (3% and 21%). The concentration of Al in solution was significantly related to the concentrations of AlNH 4 (r=0.43), Alla (r=0.50) and Alcula (r=0.45). Conclusions Ericaceae species grew in dump and slope materials because they modified the pH of the rhizospheric soil, while S. atrocinerea only grew in areas where the soil conditions were close to neutral. The concentration of aluminium fractions was higher in the Ericaceae rhizosphere soil than in Ericaceae bulk soil, S. atrocinerea rhizosphere and bulk soils. Moreover, highly stable organoaluminium complexes predominated, and the dissolved Al concentration was low, despite the strong acidity.

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“…Five common aquatic plant species (Typha latifolia, Myriophyllum exalbescens, Potamogeton epihydrus, Sparganium angustifolium, and Sparganium multipedunculatum) were tested for Al phytoremediation (Gallon et al 2004). Parrot feather (Myriophyllum aquaticum), creeping primrose (Ludwigina palustris), and water mint (Mentha aquatic) have shown to remove Fe, Zn, Cu, and Hg from contaminated water effectively (Kamal et al 2004).…”

Section: Phytoremediation Of Toxic Metals By Aquatic Plantsmentioning

confidence: 99%

Phytoremediation of Toxic Metals in Soils and Wetlands: Concepts and Applications

Rahman

Reichman

Filippis

et al. 2016

Environmental Remediation Technologies for Metal-Contaminated Soils

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Over centuries, industrial, mining and military activities, agriculture, farming, and waste practices have contaminated soils and wetlands in many countries with high concentrations of toxic metals. In addition to their negative effects on ecosystems and other natural resources, toxic metals pose a great danger to human health. Unlike organic compounds, metals cannot be degraded, and clean-up usually requires their removal. Most of the conventional remedial methods have lost economic favor and public acceptance because they are expensive and cause degradation of soil fertility that subsequently results in adverse impacts on the ecosystem. Conventional methods of environmental remediation do not solve the problem; rather they merely transfer it to future generation. Obviously, there is an urgent need for alternative, cheap, and efficient methods to clean-up sites contaminated with toxic metals.Phytoremediation, a plant-based green technology, is cost effective, environmental friendly, aesthetically pleasing approach for the remediation of toxic metals. Due to its elegance and the extent of contaminated areas, phytoremediation approaches have already received significant scientific and commercial attention. Two approaches have been proposed for the phytoremediation of toxic metals

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Hydroponic Study of Aluminum Accumulation by Aquatic Plants: Effects of Fluoride and pH

Cited by 39 publications

References 24 publications

Aluminum speciation in the bulk and rhizospheric soil solution of the species colonizing an abandoned copper mine in Galicia (NW Spain)

Aluminum speciation in the bulk and rhizospheric soil solution of the species colonizing an abandoned copper mine in Galicia (NW Spain)

Aluminium geochemistry in the bulk and rhizospheric soil of the species colonising an abandoned copper mine in Galicia (NW Spain)

Phytoremediation of Toxic Metals in Soils and Wetlands: Concepts and Applications

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