Publication:
Superoxide mediated reduction of organically complexed iron(III): Comparison of non-dissociative and dissociative reduction pathways

dc.contributor.author Garg, Shikha en_US
dc.contributor.author Rose, Andrew en_US
dc.contributor.author Waite, T en_US
dc.date.accessioned 2021-11-25T14:14:47Z
dc.date.available 2021-11-25T14:14:47Z
dc.date.issued 2007 en_US
dc.description.abstract We have investigated the mechanism of reduction of organically complexed iron(III) in the presence of superoxide, the one-electron reduced form of dioxygen that is produced in natural waters by thermal, photochemical, and biological pathways. Experimental results show that reduction of organically complexed iron(III) by superoxide may occur by either (or, in some instances, both) reaction of superoxide with inorganic iron(III) after its dissociation from the complex (dissociative reduction) or by direct reaction of superoxide with the complex (non-dissociative reduction). In the presence of low concentrations of ligands such as citrate and sulfosalicylate that bind iron(III) relatively weakly and result in complexes with high dissociation rate constants (k<sub>d</sub> > 1 × 10<sup>-4</sup> s<sup>-1</sup>), a dissociative reduction pathway dominates. However, in the presence of strong ligands or high concentrations of weak ligands, only non-dissociative reduction of complexed iron(III) occurs. The relative contribution of each pathway has major implications for the lability and hence potential bioavailablity of iron in natural waters. The simple kinetic model developed here can be used to correctly predict the superoxide-mediated formation rates of iron(II) in natural systems. © 2007 American Chemical Society. en_US
dc.identifier.uri http://hdl.handle.net/1959.4/42287
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/3.0/au/ en_US
dc.source Legacy MARC en_US
dc.subject.other Iron en_US
dc.subject.other Complexation en_US
dc.subject.other Dissociation en_US
dc.subject.other Mathematical models en_US
dc.subject.other Mathematical models en_US
dc.subject.other Mathematical models en_US
dc.subject.other Mathematical models en_US
dc.title Superoxide mediated reduction of organically complexed iron(III): Comparison of non-dissociative and dissociative reduction pathways en_US
dc.type Journal Article en
dcterms.accessRights metadata only access
dspace.entity.type Publication en_US
unsw.accessRights.uri http://purl.org/coar/access_right/c_14cb
unsw.relation.faculty Engineering
unsw.relation.ispartofissue 9 en_US
unsw.relation.ispartofjournal Environmental Science & Technology en_US
unsw.relation.ispartofpagefrompageto 3205-3212 en_US
unsw.relation.ispartofvolume 41 en_US
unsw.relation.originalPublicationAffiliation Garg, Shikha, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Rose, Andrew, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Waite, T, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.school School of Civil and Environmental Engineering *
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