Highly Mobile Iron Pool from a Dissolution-Readsorption Process
2008 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 24, no 14, 7054-7057 p.Article in journal (Refereed) Published
Oxalate (C2O42−) acts synergistically on the dissolution of goethite (α-FeOOH) in the presence of siderophores that are secreted by plants and microorganisms to sequester iron. We report here the first in situ molecular-scale observations of synergistic ligand-promoted dissolution processes. We show that there are conditions under which oxalate promotes goethite dissolution, but dissolved Fe(III) concentrations do not increase because Fe(III)-oxalate complexes readsorb to the mineral surface. We demonstrate that these readsorbed Fe(III)-oxalate complexes are highly mobile, extremely reactive in the presence of uncomplexed siderophores, and responsible for the synergistic effects on the dissolution of goethite.
Place, publisher, year, edition, pages
American Chemical Society , 2008. Vol. 24, no 14, 7054-7057 p.
IdentifiersURN: urn:nbn:se:umu:diva-10119DOI: doi:10.1021/la800785uPubMedID: 18549293OAI: oai:DiVA.org:umu-10119DiVA: diva2:149790
Web Release Date June 13, 20082008-08-052008-08-052011-09-12Bibliographically approved