Highly mobile iron pool from a dissolution-readsorption process

Summary, in English

Oxalate (C(2)O(4)(2-)) acts synergistically on the dissolution of goethite (alpha-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.

• Författare: John S. Loring; Anna A. Simanova; Per Persson
• Publiceringsår: 2008
• Språk: Engelska
• Sidor: 7054-7057
• Publikation/Tidskrift/Serie: Langmuir
• Volym: 24
• Länkar: http://dx.doi.org/10.1021/la800785u
• Dokumenttyp: Artikel i tidskrift
• Förlag: The American Chemical Society (ACS)
• Ämne: Earth and Related Environmental Sciences
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0743-7463