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- W2186019871 abstract "The toxicity of heavy metals (HM) depends on their content and speciation in the liquid and solid phases of the soil. HM associated with Fe and Mn oxides might be released under redox conditions, therefore it is important to understand the mechanisms of reductive dissolution, changes in crystallinity and redistribution in operationallydefined fractions. An important issue arises when soils containing high amounts of HM are flooded, due to the possibility of contaminant diffusion from soil to other environmental compartments. In the context of climate change for which scenarios predict an increase of the frequency and intensity of extreme floods, as well as variations in rainfall patterns and intensities [1], soil moisture status may be significantly influenced. This may result in an increasing probability of submergence of contaminated soils that are not normally waterlogged, as in numerous metalliferous mining areas around the globe. Anoxic conditions may cause the release of trace elements by reductive dissolution of oxide phases, i.e. Fe and Mn, to which they are associated [2] or through the oxidation of organic matter (OM) to which metals are complexed [3]. In addition, on the subsequent onset of oxic conditions they may be bound in a less stable form (i.e., on amorphous Fe (hydr)oxides). Some authors showed that soil redox oscillations may increase the crystallinity of Fe oxides in tropical area soils [4], thus increasing the stability of colloids which are potential carriers of HM, and the work of Contin et al. (2007) [5] concluded that redox cycles enhance fixation of some HM into Fe oxides. However, few studies have dealt with the influence of alternating oxic and anoxic conditions on the solubilization and translocation of Fe and Mn ions in solution from mineaffected soils, and their redistribution among solid-phase components as a release mechanism of metal lability. This makes it highly necessary to assess changes in Fe and Mn chemical forms as their consequent dissolution may be particularly dangerous since it could trigger the release of HM, therefore shortening the pathways for human exposure." @default.
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- W2186019871 date "2013-01-01" @default.
- W2186019871 modified "2023-09-22" @default.
- W2186019871 title "Effect of Redox Conditions on the Crystallinity of Fe Oxides in Soil" @default.
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