AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Fe(II) and H2O2 Production in the Presence of Soot
JUAN RODRIGUEZ, Stephen Bradford, Hector Casique, Dan Hinz, Ashleen Reddy, Justin Rodriguez, Anne Johansen, Central Washington University
Abstract Number: 451 Working Group: Aerosol Chemistry
Abstract Combustion of fuels leads to the emission of carbonaceous soot particles that may contain black carbon, organic molecules and trace metals. Despite the fact that ferrous iron, Fe(II), and quinone-like structures seem to contribute to soot toxicity, not much is known about (i) how these compounds are produced during combustion and after emission into the atmosphere, and (ii) how they impact the environment and human health. The purpose of this research is to study model iron-soot systems under conditions encountered in the tail pipe, the environment, and cellular systems, in order to increase our understanding of the iron redox processes that control iron speciation and soot reactivity. Wet-chemical and spectroscopic techniques are used to determine iron speciation, H2O2 production and soot characteristics in a variety of settings. Results show that soot contributes to the reduction of Fe(III) to Fe(II) and increases the production of H2O2 in the presence of biologically and environmentally relevant organic electron donors. Parameters that control the degree of reactivity between various soot types are under investigation. Observed mechanisms may play a significant role in the toxicity of soot through the related Fenton reaction that produces the highly oxidizing hydroxyl radical in reaction of Fe(II) with H2O2.