Is there a link between Fe(III) oxide reactivity, Fe(II)-catalysed crystallisation and U(VI) reduction?

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dc.contributor.authorCollins, RNen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorWaite, TDen_AU
dc.date.accessioned2011-01-28T04:07:22Zen_AU
dc.date.available2011-01-28T04:07:22Zen_AU
dc.date.issued2010-06-18en_AU
dc.date.statistics2010-06-18en_AU
dc.description.abstractThe discovery that Fe (II) catalyses the crystallisation of highly disordered Fe (III) oxides from years to hours has dramatically changed our perception of the time-scales that may be involved in the iron redox cycle with far-reaching ramifications to the kinetics of other globally important biogeochemical cycles such as carbon and sulfur [1] as well as that of redox sensitive elements such as uranium [2]. While we still explore the mechanisms of this potentially exciting new pathway in the iron redox cycle, in very simplified systems, one must ask of the relevance of such studies when these conditions are typically far-removed from those experienced in the natural environment. Indeed, when done so, it is observed that the Fe (II)-catalysed crystallisation process may not have global applicability [3, 4]. However, obtaining information on why a process does not work is often as enlightening as direct observation of the process in motion. Here we report on experiments which demonstrate that no relationship exists between Fe (III) oxide reactivity and its propensity for Fe (II)-catalysed crystallisation when the intrinsic reactivity of the Fe (III) oxide is induced by the presence of the sulfur tetrahedral oxyanion - SO4. We further demonstrate that Fe (III) oxide crystallinity is key for the Fe (II) reduction of U (VI) and, moreover, that (FeII)-U (VI) electron transfer is related to the redox potential of the Fe (II)- Fe (III) couple. In other words, U (VI) will not be reduced by Fe (II) when both are sorbed to highly disordered Fe (III) oxides such as ferrihydrite and/or schwertmannite.en_AU
dc.identifier.citationCollins, R. N., Payne, T. E., & Waite, T. D. (2010). Is there a link between Fe(III) oxide reactivity, Fe(II)-catalysed crystallisation and U(VI) reduction? Paper presented to the 20th Annual V.M. Goldschmidt Conference (Goldschmidt 2010) - "Earth, Energy and the Environment", 13th - 18th June 2010. Knoxville, Tennessee: Knoxville Convention Center. In Geochimica et Cosmochimica Acta, 74(12), A186. doi:10.1016/j.gca.2010.04.028en_AU
dc.identifier.conferenceenddate18 June 2010en_AU
dc.identifier.conferencename20th Annual V.M. Goldschmidt Conference (Goldschmidt 2010) - 'Earth, Energy and the Environment'en_AU
dc.identifier.conferenceplaceKnoxville, Tennesseeen_AU
dc.identifier.conferencestartdate13 June 2010en_AU
dc.identifier.govdoc3173en_AU
dc.identifier.issn0016-7037en_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitleGeochimica et Cosmochimica Actaen_AU
dc.identifier.paginationA186en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.gca.2010.04.028en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2960en_AU
dc.identifier.volume74en_AU
dc.language.isoenen_AU
dc.publisherElsevier; Cambridge Publicationsen_AU
dc.subjectReactivityen_AU
dc.subjectCrystallizationen_AU
dc.subjectRedox processen_AU
dc.subjectIronen_AU
dc.subjectSulfuren_AU
dc.subjectCarbonen_AU
dc.titleIs there a link between Fe(III) oxide reactivity, Fe(II)-catalysed crystallisation and U(VI) reduction?en_AU
dc.typeConference Presentationen_AU
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