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Time-dependent release of iron from soot particles by acid extraction and the reduction of fe3+ by elemental carbon

Elemental carbon reduces Fe3+ to Fe2+ in aqueous solutions. This process has
potential implications in the adverse health effects of fine particles in air pollution,
because both elemental carbon and iron are major components in atmospheric
particulate matter. In this study we measured the time-dependent release of iron from
laboratory flames and standard reference soot particles that contained iron, and the
reduction of Fe3+ to Fe2+ in an acid extraction process. The concentration of Fe3+ and
Fe2+ ions in the extraction solutions was measured by a spectrophotometric method.
The results showed that while Fe3+ was the dominant valence state in the dry soot
particles, significant fraction of iron was reduced to Fe2+ in the aqueous solution.
Further investigation is needed to assess the significance of this phenomenon in the
biological effects of particles that contain iron and elemental carbon.
Date15 May 2009
CreatorsDrake, Stephen James
ContributorsGuo, Bing
Source SetsTexas A and M University
Detected LanguageEnglish
TypeBook, Thesis, Electronic Thesis, text
Formatelectronic, application/pdf, born digital

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