Photoreduction of iron(III) in marine mineral aerosol solutions

Zhu Xiaorong Zhu, J. M. Prospero, D. L. Savoie, F. J. Millero, R. G. Zika, E. S. Saltzman

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109 Scopus citations

Abstract

Only 1% of the total Fe and 7.5% of the soluble Fe was in the Fe(II) form. Photolysis experiments were performed with solutions extracted from aerosol filter samples and with solutions of Fe(III) in acidic sodium chloride. In both systems, Fe(II) concentrations increased rapidly when the solutions were exposed to sunlight and they attained steady state within an hour. However, in all cases Fe(II) is only a minor component even when conditions are favorable for photolysis. Fe(II) formation is hindered at the low pH that is believed to be characteristic of marine aerosol solutions. Solutions with added oxalate yielded greatly increased concentrations of Fe(II). The photoreduction of Fe(III) to Fe(II) did not appear to significantly increase the dissolution of Fe(III) from the dust mineral matrix. -from Authors

Original languageEnglish (US)
Pages (from-to)9039-9046
Number of pages8
JournalJournal of Geophysical Research
Volume98
Issue numberD5
StatePublished - Jan 1 1993

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ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Xiaorong Zhu, Z., Prospero, J. M., Savoie, D. L., Millero, F. J., Zika, R. G., & Saltzman, E. S. (1993). Photoreduction of iron(III) in marine mineral aerosol solutions. Journal of Geophysical Research, 98(D5), 9039-9046.