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Fenton oxidation of gaseous isoprene nonaqueous aerosol surfaces

Colussi, Agustín J. and Kameel, Rifkha and Friboni, Francesca and Hoffmann, Michael R. (2014) Fenton oxidation of gaseous isoprene nonaqueous aerosol surfaces. In: 248th American Chemical Society National Meeting & Exposition, August 10-14, 2014, San Francisco, CA.

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We report that gas-phase isoprene ISO(g) is oxidized upon impacting the surface of aq. FeCl_2 solns. simultaneously exposed to H_2O_2(g). Expts. involve exposing microjets of micromolar FeCl_2 solns. at pH < 4 to ISO(g) + H_2O_2(g) mixts. for ∼ 10 μs within the spraying chamber of an electrospray ionization mass spectrometer (ESI-MS). Products are analyzed online in the pos. and neg. ion modes. We detect protonated monomer and oligomer species (ISO)_(1-8)H+, in accord with our previous report (J. Chem. A, 116 2012 6027), plus myriad (m/z) > 150 oxidn. products whose combined yields amt. to ∼ 5% of (ISO)_(1-8)H+. MS/MS anal. reveals that pos. ions typically split H_2O and O neutrals, whereas the less abundant neg. ions undergo CO, H_2O and CO_2 losses. All products are inhibited by the addn. of excess t-butanol to FeCl_2 solns. as ×OH scavenger. These results implicate an oxidn. process initiated by the addn. of interfacial OH and/or HO_2 to ISO leading to poly-alcs., carbonyls, hydroperoxides and carboxylic acids. We infer that gaseous olefins can be oxidized upon impacting the surface of Fe-contg. aq. environmental surfaces, including those of aerosols.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Website
Colussi, Agustín J.0000-0002-3400-4101
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2014 American Chemical Society.
Record Number:CaltechAUTHORS:20140815-093148885
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48602
Deposited By: Tony Diaz
Deposited On:22 Aug 2014 15:49
Last Modified:03 Mar 2020 13:01

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