Mineralogical and morphological constraints on the reduction of Fe(III) minerals by Geobacter sulfurreducens

Cutting, Richard S; Coker, Victoria S.; Fellowes, Jonathan; Lloyd, Jonathan R.; Vaughan, David J.

doi:10.1016/j.gca.2009.04.009

Cited by 172 publications

(176 citation statements)

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(84 reference statements)

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“…The presence of AQDS may also reduce the temporal stability of mineralogic intermediates (Coker et al, 2008). Consistent with the results of this study, the presence of AQDS enhanced magnetite formation by MRB from both ferrihydrite and lepidocrocite (Cutting et al, 2009). While these authors attributed their observations to enhanced Fe(II) flux mediated by AQDS, it is more probable that this was a direct AQDS effect as observed herein.…”

Section: Implications To Mrb-aqds-ferrihydrite Systemssupporting

confidence: 90%

“…10), contrasted with its transformation by MRB under comparable or shorter time periods (Vali et al, 2004;Cutting et al, 2009;O'Loughlin et al, 2010). Consistent with our findings, both Pedersen et al (2005) and Hansel et al (2005) also noted little transformation of lepidocrocite to magnetite by Fe(II) aq in the absence of MRB activity.…”

Section: Implications To Mrb-aqds-ferrihydrite Systemssupporting

confidence: 87%

“…Consistent with our findings, both Pedersen et al (2005) and Hansel et al (2005) also noted little transformation of lepidocrocite to magnetite by Fe(II) aq in the absence of MRB activity. Magnetite, in contrast, was an important bioreduction product of lepidocrocite by: (i) Geobacter sulfurreducens in bicarbonate buffer after 6 d (Cutting et al, 2009), that was enhanced by AQDS presence, and (ii) Shewanella putrefaciens in presence of AQDS in unbuffered media after 50 d (O'Loughlin et al, 2010). Vali et al (2004) observed the formation of lepidocrocite from ferrihydrite in 6.25 d using Geobacter metallireducens in PIPES buffer, and its subsequent complete transformation to tabular, single domain magnetite in 27.8 d. Our results, however, showed that an elevated Fe(II) aq concentration and favorable pH, as well as aqueous chemical conditions in the magnetite stability range, are alone insufficient to induce lepidocrocite transformation to magnetite over 63 d. These noted differences may result from crystallite size/reactivity effects (our recrystallized lepidocrocite was relatively large in size, Fig.…”

Section: Implications To Mrb-aqds-ferrihydrite Systemsmentioning

confidence: 99%

“…Comparisons between +AQDS and -AQDS systems suggest that the primary role of AQDS is to enhance reduction/mineralization kinetics, reaction product crystallization, and the dispersal of electron equivalents to less accessible domains, e.g., within aggregates or mineral surfaces not in cell contact Zachara et al, 1998;Coker et al 2008;Zegeye et al, 2007;Cutting et al, 2009). The presence of AQDS may also reduce the temporal stability of mineralogic intermediates (Coker et al, 2008).…”

Section: Implications To Mrb-aqds-ferrihydrite Systemsmentioning

confidence: 99%

“…The addition of the synthetic ETM, 9,10-anthraquinone-2,6-disulfonate (AQDS), to an anoxic MRB-Fe(III) mineral suspension with a suitable electron donor greatly enhances the Fe(III) reduction rate and extent Zachara et al, 1998;Royer et al, 2002;Dong et al, 2003;Hernandez et al, 2004;Chacon et al, 2006;Kukkadapu et al, 2006;Behrends and van Cappellen, 2007;Jaisi et al, 2007;Coker et al, 2008;Cutting et al, 2009). AQDS is a widely used model ETM for environmental and contaminant redox transformations of diverse type (Curtis and Reinhard, 1994;Borch et al, 2005;Bhushan et al, 2006;Finneran, 2006, 2008;Zhang et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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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: Implications To Mrb-aqds-ferrihydrite Systemssupporting

confidence: 90%