Fe(III) reduction in the presence of Catechol in seawater

J. Magdalena Santana-Casiano, M. González-Dávila, A. G. González, Frank J Millero

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Fe(II)-Fe(III) redox behavior has been studied in the presence of catechol under different pH, ionic media, and organic compound concentrations. Catechol undergoes oxidation in oxic conditions producing semiquinone and quinone and reduces Fe(III) in natural solutions including seawater (SW). It is a pH-dependent process. Under darkness, the amount of Fe(II) generated is smaller and is related to less oxidation of catechol. The Fe(II) regeneration is higher at lower pH values both in SW with log k = 1. 86 (M-1 s-1) at pH 7. 3 and 0. 26 (M-1 s-1) at pH 8. 0, and in NaCl solutions with log k of 1. 54 (M-1 s-1) at pH 7. 3 and 0. 57 (M-1 s-1) at pH 8. 0. At higher pH values, rate constants are higher in NaCl solutions than in SW. This is due to the complexation of Mg(II) present in the media with the semiquinone that inhibits the formation of a second Fe(II) through the reaction of this intermediate with other center Fe(Cat)+.

Original languageEnglish (US)
Pages (from-to)467-482
Number of pages16
JournalAquatic Geochemistry
Volume16
Issue number3
DOIs
StatePublished - Jun 2010

Fingerprint

Seawater
seawater
oxidation
Oxidation
oxic conditions
Complexation
Organic compounds
complexation
organic compound
Rate constants
regeneration
darkness
catechol
cats
quinones
organic compounds
pH-value

Keywords

  • Catechol
  • Iron
  • Kinetics
  • Oxidation
  • Reduction
  • Seawater

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Santana-Casiano, J. M., González-Dávila, M., González, A. G., & Millero, F. J. (2010). Fe(III) reduction in the presence of Catechol in seawater. Aquatic Geochemistry, 16(3), 467-482. https://doi.org/10.1007/s10498-009-9088-x

Fe(III) reduction in the presence of Catechol in seawater. / Santana-Casiano, J. Magdalena; González-Dávila, M.; González, A. G.; Millero, Frank J.

In: Aquatic Geochemistry, Vol. 16, No. 3, 06.2010, p. 467-482.

Research output: Contribution to journalArticle

Santana-Casiano, JM, González-Dávila, M, González, AG & Millero, FJ 2010, 'Fe(III) reduction in the presence of Catechol in seawater', Aquatic Geochemistry, vol. 16, no. 3, pp. 467-482. https://doi.org/10.1007/s10498-009-9088-x
Santana-Casiano JM, González-Dávila M, González AG, Millero FJ. Fe(III) reduction in the presence of Catechol in seawater. Aquatic Geochemistry. 2010 Jun;16(3):467-482. https://doi.org/10.1007/s10498-009-9088-x
Santana-Casiano, J. Magdalena ; González-Dávila, M. ; González, A. G. ; Millero, Frank J. / Fe(III) reduction in the presence of Catechol in seawater. In: Aquatic Geochemistry. 2010 ; Vol. 16, No. 3. pp. 467-482.
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