RAMONA BALINT, CRISTINA ORBECI*, GHEORGHE NECHIFOR, MARINELA PLESCA, FRANCO AJMONE-MARSAN<br>Effect of Redox Conditions on the Crystallinity of Fe Oxides in Soil

RAMONA BALINT, CRISTINA ORBECI*, GHEORGHE NECHIFOR, MARINELA PLESCA, FRANCO AJMONE-MARSAN
Effect of Redox Conditions on the Crystallinity of Fe Oxides in Soil

Abstract:

The effects of four alternating redox cycles on the release of Fe and Mn ions from a mine-affected soil, their redistribution in operationally defined fractions, and their changes in oxide crystallinity were studied by column experiments, DCB (dithionite-citrate-bicarbonate) and AO (ammonium oxalate) extractions, and BCR (Bureau Communautaire de Référence) sequential extraction. The results showed an increase of the reductive dissolution of Fe and Mn oxides with each successive redox cycle, which lead to a relative decrease of the “free” ions concentration in the solid phase, especially in the amorphous one, which might have been lost by leaching. Compared to the non-incubated soils, a relative increase in the exchangeable fraction of the flooded soils was observed, which was more pronounced with depth, due to the higher moisture regimes maintained at the bottom of the column during draining. Therefore, alternate oxic-anoxic cycles may lead to the solubilisation and redistribution of Fe and Mn ions into more labile fraction which could increase the risk of release of heavy metals (HM) associated with them. Keywords: redox, leaching, reductive dissolution, Fe and Mn oxides

Issue: 2013, Volume 64, Issue 11

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