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Highly mobile iron pool from a dissolution-readsorption process

Author:
  • John S. Loring
  • Anna A. Simanova
  • Per Persson
Publishing year: 2008
Language: English
Pages: 7054-7057
Publication/Series: Langmuir
Volume: 24
Document type: Journal article
Publisher: The American Chemical Society (ACS)
Additional info: 14

Abstract 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.

Keywords

  • Earth and Related Environmental Sciences

Other

Published
  • ISSN: 0743-7463
Per Persson
E-mail: per [dot] persson [at] biol [dot] lu [dot] se

Professor

MEMEG

+46 46 222 17 96

+46 70 266 38 79

E-C350

50

Professor

Centre for Environmental and Climate Research (CEC)

+46 46 222 17 96

+46 70 266 38 79

D350

Ekologihuset, Sölvegatan 37, Lund

50