TY - JOUR
T1 - UV spectra and OH-oxidation kinetics of gaseous phase morpholinic compounds
AU - Rachidi, Mariam El
AU - El Masri, A.
AU - Roth, E.
AU - Chakir, A.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors would like to acknowledge the Region of Champagne-Ardenne for financing this study, as well as programs AQUAL and VOLUBILIS-AI no : .MA/10/226
PY - 2014/5
Y1 - 2014/5
N2 - This paper presents an experimental study of the UV spectra as well as the kinetics of gaseous phase OH-oxidation of morpholine, N-formylmorpholine (NFM) and N-acetlymorpholine (NAM). The spectra recorded using a UV spectrometer in the spectral range 200-280nm show that the analytes mainly absorb at wavelengths less than 280nm. This indicates that their photolysis potential in the troposphere is insignificant. Meanwhile, the OH-reactivity of these analytes was studied using a triple-jacket 2m long reactor equipped with a multi-reflection system and coupled to an FTIR spectrometer. The experiments were carried out at 295 and 313K for the amine and amides, respectively. The study was conducted in the relative mode using isoprene and benzaldehyde as reference compounds. The rate constants obtained are 14.0±1.9, 4.0±1.1 and 3.8±1.0 (in units of 10-11cm3molecule-1s-1) for morpholine, NFM and NAM respectively. These results are discussed in terms of reactivity and compared to those obtained for other oxy-nitrogenated species. In addition, the determined rate constants are used to estimate effective atmospheric lifetimes of the investigated morpholinic compounds with respect to reaction with OH radicals. © 2014 Elsevier Ltd.
AB - This paper presents an experimental study of the UV spectra as well as the kinetics of gaseous phase OH-oxidation of morpholine, N-formylmorpholine (NFM) and N-acetlymorpholine (NAM). The spectra recorded using a UV spectrometer in the spectral range 200-280nm show that the analytes mainly absorb at wavelengths less than 280nm. This indicates that their photolysis potential in the troposphere is insignificant. Meanwhile, the OH-reactivity of these analytes was studied using a triple-jacket 2m long reactor equipped with a multi-reflection system and coupled to an FTIR spectrometer. The experiments were carried out at 295 and 313K for the amine and amides, respectively. The study was conducted in the relative mode using isoprene and benzaldehyde as reference compounds. The rate constants obtained are 14.0±1.9, 4.0±1.1 and 3.8±1.0 (in units of 10-11cm3molecule-1s-1) for morpholine, NFM and NAM respectively. These results are discussed in terms of reactivity and compared to those obtained for other oxy-nitrogenated species. In addition, the determined rate constants are used to estimate effective atmospheric lifetimes of the investigated morpholinic compounds with respect to reaction with OH radicals. © 2014 Elsevier Ltd.
UR - http://hdl.handle.net/10754/594255
UR - https://linkinghub.elsevier.com/retrieve/pii/S135223101400082X
UR - http://www.scopus.com/inward/record.url?scp=84895740130&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2014.01.057
DO - 10.1016/j.atmosenv.2014.01.057
M3 - Article
SN - 1352-2310
VL - 88
SP - 261
EP - 268
JO - Atmospheric Environment
JF - Atmospheric Environment
ER -