Mechanisms and Pathways of Trace Element Mobility in Soils

Carrillo-González, Rogelio; Šimůnek, Jirka; Sauvé, Sébastien; Adriano, D. C.

doi:10.1016/s0065-2113(06)91003-7

Cited by 166 publications

(98 citation statements)

References 215 publications

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“…When Mn and Fe are reduced, they become several order of magnitude more soluble than their oxidized compounds and may rapidly release the elements that are associated to them to the soil solution. 2,3 As soils generally serve as a sink for numerous contaminants like pesticides, dioxins, agricultural chemicals, and metallic elements (ME), submergence may result in the release of these pollutants from the soil to other environmental compartments. 4 While the effect of water saturation on the release of ME from riverine, agricultural and urban soils is well documented, [5][6][7][8][9] less information is available about mine and smelter-affected areas.…”

Section: Introductionmentioning

confidence: 99%

“…10,11 Intermittent flooding/drying and the consequent reductive and oxidative conditions may affect the chemical speciation, bioavailability, toxicity and mobility of metals in the soil. 2,3 It is generally 3 agreed that the release of ME into solution can be influenced by wet/dry cycles, 12,13 but ME mobilization can also be counteracted by their stabilization due to other processes that take place under reducing conditions. Contradictory information regarding the effect of intermittent submergence on the behaviour of ME in pore water has been reported.…”

Section: Introductionmentioning

confidence: 99%

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Leaching potential of metallic elements from contaminated soils under anoxia

Balint

Nechifor

Ajmone-Marsan

2014

Environ. Sci.: Processes Impacts

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Environmental ImpactThe higher frequency and intensity of extreme rainfall events, as well as the variations in precipitation patterns and intensities as a result of climate change may cause important shifts in soil hydrological regime. This could expose contaminated soils to significant variations in redox potentials possibly influencing metallic element behaviour and their potential transfer to other environmental compartments. This study shows that alternating soil redox conditions may enhance the release and redistribution of metals in more labile fractions. In particular, the presence of redox-sensitive minerals, such as chalcopyrite, in soils affected by mine tailings, could release significant amounts of Cu due to the alternating redox conditions and therefore have important environmental implications. Graphical abstractThe alternation of redox cycles may play a higher role in the release, leaching and redistribution of metallic elements from contaminated soils with respect to oxidizing and reducing conditions alone. AbstractUnderstanding metallic element (ME) behaviour in soils subjected to alternating redox conditions is of significant environmental importance, particularly for contaminated soils. Although variations in the hydrological status of soils may lead to the release of ME, redox-driven changes in ME dynamics are still not sufficiently understood. We studied the effects of alternating redox cycles 2 on the release, leaching and redistribution of Zn, Cu and Pb in metal mine-contaminated and noncontaminated soils by means of a column experiment. Although the release of Zn was promoted by the onset of reductive conditions, successive redox cycles favoured metal partitioning in less labile fractions limiting its further mobilization. The release of Cu in soil porewaters and redistribution in the solid phase towards more labile pools were strongly dependent on the alternation between oxidizing and reducing conditions. In contaminated soils, the presence of chalcopyrite could have determined the release of Cu under oxic conditions and its relative immobilization under subsequent anoxic conditions. The behaviour of Pb did not seem to be influence by redox status, although higher concentrations in the column leachates with respect to soil porewaters suggested that alternating redox conditions could nonetheless result in substantial mobilization. This study provides evidence that the alternation of soil redox conditions may play a more important role in determining the release and leaching of metallic elements from soils with respect to reducing or oxidizing conditions considered separately.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Leaching potential of metallic elements from contaminated soils under anoxia

Balint

Nechifor

Ajmone-Marsan

2014

Environ. Sci.: Processes Impacts

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“…Therefore, Fe deficiency is a frequent problem for many crops, particularly in calcareous soils (Mengel et al 2001). Since Fe geochemistry is strictly connected with physical, chemical, and biological processes occurring in soil (Carrillo-Gonzáles et al 2006), factors influencing these processes could significantly affect the relative presence of the different Fe forms and, in turn, the micronutrient availability for the organisms (microorganisms and plants). As up to now several aspects related to these phenomena are still poorly understood, a more detailed knowledge concerning the processes involved in the Fe biogeochemistry in soil and of what could exert an impact favoring higher level of Fe availability for crops maintaining contemporarily the natural fertility of soils becomes relevant.…”

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confidence: 99%

Review on iron availability in soil: interaction of Fe minerals, plants, and microbes

et al. 2013

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“…Elements such as As, Cr, Se, Ni, Cd, and Pb are enriched in mine pool water and stream water samples, indicating that these elements are present in the form of water-soluble compounds and are readily liberated from the source. Acidic pH levels also promoted Cu, Pb, As, and Ni mobility [5][6][7][8], resulting in higher concentrations in weathered soils and ochre sediments at Parys Mountain. Elements which show low enrichment or an overall decrease in concentrations from bedrock source to weathered sediments (e.g., S, Co, and Te) were likely non-reactive and not liberated during oxidation and any processes of dissolution.…”

Section: Trace Element Liberation and Fixationmentioning

confidence: 99%

“…Sulphide-mineral oxidation within current and former mine sites is a significant environmental threat faced by the mining industry worldwide [2]. Elements such as Se, Te, As, Cd, Hg, and Pb are notable pollutants in waste sites due to their widespread and intense occurrence, and can be damaging to ecological and human health, affecting livestock, soils, and groundwater systems [3][4][5][6][7][8][9][10][11]. Conversely, the need for new low-carbon energies and technologies has led to an increase in demand for many critical raw materials such as Se [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Selenium and Other Trace Element Mobility in Waste Products and Weathered Sediments at Parys Mountain Copper Mine, Anglesey, UK

et al. 2017

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Abstract:The Parys Mountain copper mining district (Anglesey, North Wales) hosts exposed pyritic bedrock, solid mine waste spoil heaps, and acid drainage (ochre sediment) deposits. Both natural and waste deposits show elevated trace element concentrations, including selenium (Se), at abundances of both economic and environmental consideration. Elevated concentrations of semimetals such as Se in waste smelts highlight the potential for economic reserves in this and similar base metal mining sites. Selenium is sourced from the pyritic bedrock and concentrations are retained in red weathering smelt soils, but lost in bedrock-weathered soils and clays. Selenium correlates with Te, Au, Bi, Cd, Hg, Pb, S, and Sb across bedrock and weathered deposits. Man-made mine waste deposits show enrichment of As, Bi, Cu, Sb, and Te, with Fe oxide-rich smelt materials containing high Pb, up to 1.5 wt %, and Au contents, up to 1.2 ppm. The trace elements As, Co, Cu, and Pb are retained from bedrock to all sediments, including high Cu content in Fe oxide-rich ochre sediments. The high abundance and mobility of trace elements in sediments and waters should be considered as potential pollutants to the area, and also as a source for economic reserves of previously extracted and new strategic commodities.

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Mechanisms and Pathways of Trace Element Mobility in Soils

Cited by 166 publications

References 215 publications

Leaching potential of metallic elements from contaminated soils under anoxia

Leaching potential of metallic elements from contaminated soils under anoxia

Review on iron availability in soil: interaction of Fe minerals, plants, and microbes

Selenium and Other Trace Element Mobility in Waste Products and Weathered Sediments at Parys Mountain Copper Mine, Anglesey, UK

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