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Journal of Atmospheric Chemistry

, Volume 51, Issue 3, pp 317–335 | Cite as

Products and Mechanism of the NO3 Reaction with Thiophene

  • B. CabañasEmail author
  • M. T. Baeza
  • P. MartÍn
  • S. Salgado
  • F. Villanueva
  • E. Monedero
  • K. Wirtz
Article

Abstract

Products of the gas-phase reaction of the NO3 radical with thiophene have been investigated using different experimental systems. On the one hand, experiments have been conducted in our laboratory using two different methods, a Teflon static reactor coupled to a gas chromatograph combined with mass-spectrometry (GC-MS) and a discharge flow tube with direct MS spectroscopic detection. A qualitative analysis in these cases indicates that possible products for the reaction of thiophene+NO3 at room temperature include: sulphur dioxide, acetic and formic acids, a short-chain aldehyde, 2-nitrothiophene and 3-nitrothiophene. On the other hand, quantitative experiments have been performed in the European Photoreactor (EUPHORE) in Valencia, Spain. In this case, the major products were: HNO3 (≈80%), nitrothiophenes (≈30%), SO2 (≈20%), propanal (3%) and a fraction of particles (≈10%). The results obtained indicate that at least 70% of the reaction of NO3 with thiophene proceeds by an H-abstraction process at room temperature. The mechanism of the reaction studied is proposed on the basis of experimental results.

Keywords

GC-MS spectrometer NO3 reaction products thiophene flow-tube EUPHORE 

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • B. Cabañas
    • 1
    Email author
  • M. T. Baeza
    • 1
  • P. MartÍn
    • 1
  • S. Salgado
    • 1
  • F. Villanueva
    • 1
  • E. Monedero
    • 1
  • K. Wirtz
    • 2
  1. 1.Departamento de Química Física, Facultad de QuímicasUniversidad de Castilla-La ManchaCiudad-RealSpain
  2. 2.Fundación CEAM (Centro de Estudios Ambientales del Mediterraneo)Parque tecnológicoPaterna (Valencia)Spain

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