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Atmospheric degradation of 2- nitrobenzaldehyde: Photolysis and reaction with OH radicals
https://orcid.org/0000-0001-6758-7596
AbstractThis work presents an experimental study of the gas phase kinetics of 2-nitrobenzaldehyde (2-NBA) photolysis and oxidation by OH radicals. The experiments were carried out in an atmospheric simulation chamber coupled to an FTIR spectrometer and CG/MS. The UV spectra of 2-NBA were also measured and the experimentally determined absorption cross sections were used to estimate the atmospheric photo-dissociation constant of 2-NBA with a global quantum yield of 0.5. The obtained results indicate that 2-NBA is a highly photolysable. A mechanism of 2-NBA photolysis was proposed based on the identification of photolysis degradation products. The kinetics of oxidation of 2-NBA by OH radicals was investigated over the temperature range 308–352 K. The obtained rate coefficients exhibits slight negative temperature dependence and the Arrhenius expression obtained is as follows: kOH+2-NBA(T)= (7.00 ± 3.40) × 10−12exp (577 ± 156/T) cm3 molecule−1 s−1. The calculated rate coefficients lead to tropospheric lifetimes of 2-NBA that are in the order of a few minutes, relative to photolysis, or a few hours, relative to oxidation by OH radicals.
Graphical abstract
HighlightsThe UV absorption of 2-nitrobenzaldehyde (2-NBA), in gas phase, have been measured.This work provides the kinetic of the photolysis and OH reaction of 2-NBA.A possible degradation products for photolysis of 2-NBA were identified.The kinetic study with OH was carried out over the temperature range 308–352 K.The tropospheric lifetimes of this compound is estimated.
Atmospheric degradation of 2- nitrobenzaldehyde: Photolysis and reaction with OH radicals
https://orcid.org/0000-0001-6758-7596
AbstractThis work presents an experimental study of the gas phase kinetics of 2-nitrobenzaldehyde (2-NBA) photolysis and oxidation by OH radicals. The experiments were carried out in an atmospheric simulation chamber coupled to an FTIR spectrometer and CG/MS. The UV spectra of 2-NBA were also measured and the experimentally determined absorption cross sections were used to estimate the atmospheric photo-dissociation constant of 2-NBA with a global quantum yield of 0.5. The obtained results indicate that 2-NBA is a highly photolysable. A mechanism of 2-NBA photolysis was proposed based on the identification of photolysis degradation products. The kinetics of oxidation of 2-NBA by OH radicals was investigated over the temperature range 308–352 K. The obtained rate coefficients exhibits slight negative temperature dependence and the Arrhenius expression obtained is as follows: kOH+2-NBA(T)= (7.00 ± 3.40) × 10−12exp (577 ± 156/T) cm3 molecule−1 s−1. The calculated rate coefficients lead to tropospheric lifetimes of 2-NBA that are in the order of a few minutes, relative to photolysis, or a few hours, relative to oxidation by OH radicals.
Graphical abstract
HighlightsThe UV absorption of 2-nitrobenzaldehyde (2-NBA), in gas phase, have been measured.This work provides the kinetic of the photolysis and OH reaction of 2-NBA.A possible degradation products for photolysis of 2-NBA were identified.The kinetic study with OH was carried out over the temperature range 308–352 K.The tropospheric lifetimes of this compound is estimated.
Atmospheric degradation of 2- nitrobenzaldehyde: Photolysis and reaction with OH radicals
https://orcid.org/0000-0001-6758-7596
AbstractThis work presents an experimental study of the gas phase kinetics of 2-nitrobenzaldehyde (2-NBA) photolysis and oxidation by OH radicals. The experiments were carried out in an atmospheric simulation chamber coupled to an FTIR spectrometer and CG/MS. The UV spectra of 2-NBA were also measured and the experimentally determined absorption cross sections were used to estimate the atmospheric photo-dissociation constant of 2-NBA with a global quantum yield of 0.5. The obtained results indicate that 2-NBA is a highly photolysable. A mechanism of 2-NBA photolysis was proposed based on the identification of photolysis degradation products. The kinetics of oxidation of 2-NBA by OH radicals was investigated over the temperature range 308–352 K. The obtained rate coefficients exhibits slight negative temperature dependence and the Arrhenius expression obtained is as follows: kOH+2-NBA(T)= (7.00 ± 3.40) × 10−12exp (577 ± 156/T) cm3 molecule−1 s−1. The calculated rate coefficients lead to tropospheric lifetimes of 2-NBA that are in the order of a few minutes, relative to photolysis, or a few hours, relative to oxidation by OH radicals.
Graphical abstract
HighlightsThe UV absorption of 2-nitrobenzaldehyde (2-NBA), in gas phase, have been measured.This work provides the kinetic of the photolysis and OH reaction of 2-NBA.A possible degradation products for photolysis of 2-NBA were identified.The kinetic study with OH was carried out over the temperature range 308–352 K.The tropospheric lifetimes of this compound is estimated.
Atmospheric degradation of 2- nitrobenzaldehyde: Photolysis and reaction with OH radicals
Bouya, H. (Autor:in) / Al Rashidi, M. (Autor:in) / Roth, E. (Autor:in) / Salghi, R. (Autor:in) / Chakir, A. (Autor:in)
Atmospheric Environment ; 171 ; 221-228
07.10.2017
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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