The effect of silica and natural organic matter on the Fe(II)-catalysed transformation and reactivity of Fe(III) minerals

Jones, Adele M.; Collins, Richard N.; Rose, Jérôme; Waite, T. David

doi:10.1016/j.gca.2009.04.025

Cited by 336 publications

(433 citation statements)

References 52 publications

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“…Unpublished studies by our laboratory reveal only slight differences in the fundamental reaction rate of AH 2 DS with fresh 2-line ferrihydrite precipitate and an identical preparation with 0.02 mol Si:mole Fe. In contrast, significantly higher concentrations of coprecipitated Si (e.g., 0.68 mol Si:mole Fe) change the reductive mineralization behavior of ferrihydrite and suppresses its reactivity with Fe(II) aq (Jones et al, 2009). …”

Section: Discussionmentioning

confidence: 98%

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The mineralogic transformation of ferrihydrite induced by heterogeneous reaction with bioreduced anthraquinone disulfonate (AQDS) and the role of phosphate

Zachara¹,

Kukkadapu²,

Peretyazhko³

et al. 2011

Geochimica et Cosmochimica Acta

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Bruce, "The mineralogic transformation of ferrihydrite induced by heterogeneous reaction with bioreduced anthraquinone disulfonate (AQDS) and the role of phosphate" (2011 Abstract Bioreduced anthraquinone-2,6-disulfonate (AH 2 DS; dihydro-anthraquinone) was reacted with a 2-line, Si-substituted ferrihydrite under anoxic conditions at neutral pH in PIPES buffer. Phosphate (P) and bicarbonate (C); common adsorptive oxyanions and media/buffer components known to effect ferrihydrite mineralization; and Fe(II) aq (as a catalytic mineralization agent) were used in comparative experiments. Heterogeneous AH 2 DS oxidation coupled with Fe(III) reduction occurred within 0.13-1 day, with mineralogic transformation occurring thereafter. The product suite included lepidocrocite, goethite, and/or magnetite, with proportions varing with reductant:oxidant ratio (r:o) and the presence of P or C. Lepidocrocite was the primary product at low r:o in the absence of P or C, with evidence for multiple formation pathways. Phosphate inhibited reductive recrystallization, while C promoted goethite formation. Stoichiometric magnetite was the sole product at higher r:o in the absence and presence of P. Lepidocrocite was the primary mineralization product in the Fe(II) aq system, with magnetite observed at near equal amounts when Fe(II) was high [Fe(II)/Fe(III)] = 0.5 and P was absent. P had a greater effect on reductive mineralization in the Fe(II) aq system, while AQDS was more effective than Fe(II) aq in promoting magnetite formation. The mineral products of the direct AH 2 DS-driven reductive reaction are different from those observed in AH 2 DS-ferrihydite systems with metal reducing bacteria, particularly in presence of P. Ó

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Section: Discussionmentioning

confidence: 98%

“…Is it possible for desorbed Si to further enrich Si in the residual ferrihydrite to levels that impact its subsequent reactivity with Fe(II)? The behavior of Si should be considered in future experiments given the recent results of Jones et al (2009).…”

Section: Influence Of Pmentioning

confidence: 99%

The mineralogic transformation of ferrihydrite induced by heterogeneous reaction with bioreduced anthraquinone disulfonate (AQDS) and the role of phosphate

Zachara¹,

Kukkadapu²,

Peretyazhko³

et al. 2011

Geochimica et Cosmochimica Acta

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“…Furthermore organic matter coprecipitated with ferrihydrite differs in amount and composition from adsorbed organic matter (which can be relatively enriched in polysaccharides; Eusterhues et al, 2011). Adsorbed fulvic acids are able to slow down the rate at which ferrihydrite transforms to more stable (oxyhydr)oxides by blocking dissolution sites or hindering the nucleation of the more stable phases (Jones et al, 2009). Might the retardation effects on transformation (Vilge-Ritter et al, 1999) be less efficient with discontinuous coatings or with coprecipitated organic matter?…”

Section: Si-2 Filterable Iron and Complexed Iron In Seawatermentioning

confidence: 99%

The Iron Biogeochemical Cycle Past and Present

Raiswell¹,

Canfield²

2012

GeochemPersp

568

445

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“…It was suggested that they may enhance Fe(III) reduction by electron shuttling (Lovley et al, 1996;Hansel et al, 2004;Jiang and Kappler, 2008;Roden et al, 2010), complexation of Fe(II) (Royer et al, 2002), or complexation and dissolution of Fe(III) (Jones et al, 2009). Amstaetter et al (2012) and Jiang and Kappler (2008) observed that the concentration of humic acid or the mineral / humic acid ratio may control whether humic acids increase reduction or not.…”

Section: K Eusterhues Et Al: Fh-associated Om Inhibits Fe(iii) Redumentioning

confidence: 99%

Reduction of ferrihydrite with adsorbed and coprecipitated organic matter: microbial reduction by <i>Geobacter bremensis</i> vs. abiotic reduction by Na-dithionite

et al. 2014

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Abstract. Ferrihydrite is a widespread poorly crystalline Fe oxide which becomes easily coated by natural organic matter in the environment. This mineral-bound organic matter entirely changes the mineral surface properties and therefore the reactivity of the original mineral. Here, we investigated 2-line ferrihydrite, ferrihydrite with adsorbed organic matter, and ferrihydrite coprecipitated with organic matter for microbial and abiotic reduction of Fe(III). Ferrihydrite-organic matter associations with different organic matter loadings were reduced either by Geobacter bremensis or abiotically by Na-dithionite. Both types of experiments showed decreasing initial Fe-reduction rates and decreasing degrees of reduction with increasing amounts of mineral-bound organic matter. At similar organic matter loadings, coprecipitated ferrihydrites were more reactive than ferrihydrites with adsorbed organic matter. The difference can be explained by the smaller crystal size and poor crystallinity of such coprecipitates. At small organic matter loadings the poor crystallinity of coprecipitates led to even faster Fe-reduction rates than found for pure ferrihydrite. The amount of mineral-bound organic matter also affected the formation of secondary minerals: goethite was only found after reduction of organic matter-free ferrihydrite and siderite was only detected when ferrihydrites with relatively low amounts of mineral-bound organic matter were reduced. We conclude that direct contact of G. bremensis to the Fe oxide mineral surface was inhibited by attached organic matter. Consequently, mineral-bound organic matter shall be taken into account as a factor in slowing down reductive dissolution.

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The effect of silica and natural organic matter on the Fe(II)-catalysed transformation and reactivity of Fe(III) minerals

Cited by 336 publications

References 52 publications

The mineralogic transformation of ferrihydrite induced by heterogeneous reaction with bioreduced anthraquinone disulfonate (AQDS) and the role of phosphate

The mineralogic transformation of ferrihydrite induced by heterogeneous reaction with bioreduced anthraquinone disulfonate (AQDS) and the role of phosphate

The Iron Biogeochemical Cycle Past and Present

Reduction of ferrihydrite with adsorbed and coprecipitated organic matter: microbial reduction by <i>Geobacter bremensis</i> vs. abiotic reduction by Na-dithionite

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The effect of silica and natural organic matter on the Fe(II)-catalysed transformation and reactivity of Fe(III) minerals

Cited by 336 publications

References 52 publications

The mineralogic transformation of ferrihydrite induced by heterogeneous reaction with bioreduced anthraquinone disulfonate (AQDS) and the role of phosphate

The mineralogic transformation of ferrihydrite induced by heterogeneous reaction with bioreduced anthraquinone disulfonate (AQDS) and the role of phosphate

The Iron Biogeochemical Cycle Past and Present

Reduction of ferrihydrite with adsorbed and coprecipitated organic matter: microbial reduction by &lt;i&gt;Geobacter bremensis&lt;/i&gt; vs. abiotic reduction by Na-dithionite

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Reduction of ferrihydrite with adsorbed and coprecipitated organic matter: microbial reduction by <i>Geobacter bremensis</i> vs. abiotic reduction by Na-dithionite