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| Titel |
Reactivity of γ-Terpinene with NO3 radicals: experimental approach for kinetic and mechanistic study. |
| VerfasserIn |
Axel Fouqueau, Manuela Cirtog, Meryll Le Quilleuc, Mathieu Cazaunau, Edouard Pangui, Marius Duncianu, Jean-François Doussin, Bénédicte Picquet-Varrault |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250144599
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| Publikation (Nr.) |
 EGU/EGU2017-8444.pdf |
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| Zusammenfassung |
| Biogenic Volatile Organic Compounds (BVOC) are highly emitted by vegetation and play a key role in atmospheric chemistry. They are very reactive with atmospheric oxidants (OH, NO3, ozone) and significantly contribute to the formation of Secondary Organic Aerosol (SOA) at the global scale [1]. In addition, night-time chemistry initiated by NO3 radicals leads to the formation of organic nitrates which behave as reservoirs for reactive nitrogen. However, the reactivity of NO3 radical with BVOCs other than isoprene and α- and β-pinene, remains poorly understood.
Among the BVOCs, γ-Terpinene is one of the most emitted by vegetation[2]. Two kinetic works were previously published on γ-Terpinene [3] [4], but mechanistic has never been studied. Thus, the aim of this work is to study the reactivity of γ-Terpinene with NO3 by performing experiments in simulation chambers. Kinetic, mechanism and SOA yield will be investigated. For this purpose, two different simulation chambers have been used:
- First one, consisting of a Pyrex reactor of 1 m3 [5] coupled to a long path in situ FTIR spectrometer and a Proton Transfer Reaction Time of Flight Mass Spectrometer (PTR-ToF-MS) in NO+ mode which was internally developed in LISA, to measure organic nitrates concentration.
- Second one, the CESAM chamber (http://cesam.cnrs.fr) [6] is a 4.2 m3 stainless steel chamber which permits to conduct SOA experiments at different temperature and relative humidity. In situ FTIR and PTR-ToF-MS are used to measure gaseous concentrations, and a SMPS was used to characterize particulate phase.
Kinetic and mechanistic results will be discussed and compared with the literature values.
References
[1] Brown S. S., Stutz J., Nighttime radical observations and chemistry. Chem. Soc. Rev. (2012) 41, 6405–6447
[2] Helmig D., Klinger L.F., et al., Biogenic volatile organic compound emissions (BVOCs) I. Identifications from three continental sites in the U.S. Chemosphere. (1999), Vol. 38, No. 9, pp. 2163-2187.
[3] Atkinson, R., Aschmann, S. M., Winer, A. M., and Pitts, J. N., Env. Sci. Tech. (1985) 19, 159-163.
[4] Martínez, E., Cabañas, B., Aranda, A., Martín, P., and Salgado, S., J. Atmos. Chem. (1999) 33, 265- 282.
[5] J.-F. Doussin, D. Ritz, A. Monod, R. Durand-Jolibois, P. Carlier, Design of an environmental chamber for the study of atmospheric chemistry : new developments in analytical device, Analusis. (1997) 25, 236-242.
[6] Wang, J., et al., Atmos. Measur. Tech. (2011) 4, 2465-2494. |
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