Alteration of ferrihydrite reductive dissolution and transformation by adsorbed As and structural Al: Implications for As retention

Masue-Slowey, Yoko; Loeppert, Richard H.; Fendorf, Scott

doi:10.1016/j.gca.2010.11.016

Cited by 83 publications

(59 citation statements)

References 48 publications

(71 reference statements)

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“…Previous studies stated that metal-substitution in iron (hydr)oxides slowed down the phase transformation [31,32]. The substituted metal could block the reductive dissolution of iron and reduce the bulk electron conduction, thus inhibiting the iron atom exchange or electron exchange between Fe(II) aq and Fe(III) oxide [6,33].…”

Section: The Mechanism Of Fe(ii) Aq -Induced Ferrihydrite Transformatmentioning

confidence: 99%

Aqueous Fe(II)-Induced Phase Transformation of Ferrihydrite Coupled Adsorption/Immobilization of Rare Earth Elements

et al. 2018

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Abstract:The phase transformation of iron minerals induced by aqueous Fe(II) (Fe(II) aq ) is a critical geochemical reaction which greatly affects the geochemical behavior of soil elements. How the geochemical behavior of rare earth elements (REEs) is affected by the Fe(II) aq -induced phase transformation of iron minerals, however, is still unknown. The present study investigated the adsorption and immobilization of REEs during the Fe(II) aq -induced phase transformation of ferrihydrite. The results show that the heavy REEs of Ho(III) were more efficiently adsorbed and stabilized compared with the light REEs of La(III) by ferrihydrite and its transformation products, which was due to the higher adsorptive affinity and smaller atomic radius of Ho(III). Both La(III) and Ho(III) inhibited the Fe atom exchange between Fe(II) aq and ferrihydrite, and sequentially, the Fe(II) aq -induced phase transformation rates of ferrihydrite, because of the competitive adsorption with Fe(II) aq on the surface of iron (hydr)oxides. Owing to the larger amounts of adsorbed and stabilized Ho(III), the inhibition of the Fe(II) aq -induced phase transformation of ferrihydrite affected by Ho(III) was higher than that by La(III). Our findings suggest an important role for the Fe(II) aq -induced phase transformation of iron (hydr)oxides in assessing the mobility and transfer behavior of REEs, as well as for their occurrence in earth surface environments.

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Section: The Mechanism Of Fe(ii) Aq -Induced Ferrihydrite Transformatmentioning

confidence: 99%

Aqueous Fe(II)-Induced Phase Transformation of Ferrihydrite Coupled Adsorption/Immobilization of Rare Earth Elements

et al. 2018

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“…Soil OM (Schwertmann, 1966), P (Châtellier et al, 2013), Al (Masue-Slowey et al, 2011), silicate (Cismasu et al, 2014) and As (Ford, 2002) are known to stabilize Fe polyhedra in very primitive arrangements, i.e. low-crystalline ferrihydrite.…”

Section: Structural Changes In the Fe-om Co-precipitates At Transientmentioning

confidence: 99%

Structure and composition of Fe–OM co-precipitates that form in soil-derived solutions

Fritzsche

Schröder

Wieczorek

et al. 2015

Geochimica et Cosmochimica Acta

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Iron oxides represent a substantial fraction of secondary minerals and particularly affect the reactive properties of natural systems in which they formed, e.g. in soils and sediments. Yet, it is still obscure how transient conditions in the solution will affect the properties of in situ precipitated Fe oxides. Transient compositions, i.e. compositions that change with time, arise due to predominant non-equilibrium states in natural systems, e.g. between liquid and solid phases in soils. In this study, we characterize Fe-OM co-precipitates that formed in pH-neutral exfiltrates from anoxic topsoils under transient conditions. We applied soil column outflow experiments, in which Fe 2+ was discharged with the effluent from anoxic soil and subsequently oxidized in the effluent due to contact with air. Our study features three novel aspects being unconsidered so far: 3

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“…For instance, within weeks substantial isotopic equilibration can occur between aqueous Fe 2+ (aq) and goethite (Handler et al, 2009), ferrihydrite and lepidocrocite (Pedersen et al, 2005), and some with magnetite (Gorski et al, 2012), whereas with hematite, no atom exchange appears to occur even over time scales of months (Pedersen et al, 2005). Furthermore, Fe atom exchange can be inhibited when Al or other elements substitute in the Fe mineral structure or if Si ions or organic matter adsorb to the mineral surface (Jones et al, 2009;Gorski and Scherer, 2011;Masue-Slowey et al, 2011;Latta et al, 2012). This raises the question whether Fe atom exchange takes place in natural soils and sediments, which contain Fe mineral phases that are often highly substituted by Al and contain a range of inorganic ions and organic compounds on their surfaces.…”

Section: Introductionmentioning

confidence: 99%

Fe2+ catalyzed iron atom exchange and re-crystallization in a tropical soil

Tishchenko

Meile

Scherer

et al. 2015

Geochimica et Cosmochimica Acta

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Alteration of ferrihydrite reductive dissolution and transformation by adsorbed As and structural Al: Implications for As retention

Cited by 83 publications

References 48 publications

Aqueous Fe(II)-Induced Phase Transformation of Ferrihydrite Coupled Adsorption/Immobilization of Rare Earth Elements

Aqueous Fe(II)-Induced Phase Transformation of Ferrihydrite Coupled Adsorption/Immobilization of Rare Earth Elements

Structure and composition of Fe–OM co-precipitates that form in soil-derived solutions

Fe2+ catalyzed iron atom exchange and re-crystallization in a tropical soil

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