Reduction of oxyiron(V) by sulfite and thiosulfate in aqueous solution. Academic Article

abstract

• The reduction of oxyiron(V), Fe(V)O(4)(3-) by inorganic oxysulfur species (SO(3)(2-) and S2O(3)(2-)) has been studied anaerobically in alkaline medium by using a premix pulse radiolysis technique. Studies on the reactions of Fe(VI)O(4)(2-) with the two sulfur radicals were also carried out. The spectroscopic results demonstrated that sulfur radicals reduced Fe(VI)O(4)(2-) to Fe(V)O(4)(3-) which is subsequently reduced by oxysulfur species by a two-electron reduction step to Fe(III). The rate constants for reduction of Fe(VI)O(4)(2-) to Fe(V)O(4)(3-) by sulfite and thiosulfate radicals (*SO3- and S4O(6)(*3-)) were found to be (1.9 +/- 0.3) x 10(8) and (7.5 +/- 0.8) x 10(7) M(-1) s(-1), respectively. However, the reactions of Fe(V)O(4)(3-) with the SO(3)(2-) and S2O(3)(2-) ions were separated by an order of magnitude, with SO(3)(2-) reacting at (3.9 +/- 0.3) x 10(4) M(-1) s(-1) while S2O(3)(2-) reacted with Fe(V) at (2.1 +/- 0.1) x 10(3) M(-1) s(-1) at pH 11.4.

authors

• Sharma, Virender

published proceedings

• J Phys Chem A

author list (cited authors)

• Sharma, V. K., & Cabelli, D.

citation count

• 23

complete list of authors

• Sharma, Virender K||Cabelli, Diane

publication date

• August 2009

publisher

• American Chemical Society (ACS)  Publisher

published in

• The Journal of Physical Chemistry A: Isolated Molecules, Clusters, Radicals, and Ions; Environmental Chemistry, Geochemistry, and Astrochemistry; Theory  Journal

keywords

• Ferric Compounds
• Hydrogen-Ion Concentration
• Kinetics
• Oxidation-Reduction
• Solutions
• Sulfites
• Sulfur
• Thiosulfates
• Water

PubMed Central ID

• 19603757

Digital Object Identifier (DOI)

• 10.1021/jp901994x

start page

• 8901

end page

• 8906

volume

• 113

issue

• 31

URL

• http://dx.doi.org/10.1021/jp901994x