Experimental and Theoretical Understanding of the Gas Phase Oxidation of Atmospheric Amides with OH Radicals: Kinetics, Products, and Mechanisms
Nadine Borduas, Gabriel da Silva, Jennifer G Murphy, Jonathan PD Abbatt
JOURNAL OF PHYSICAL CHEMISTRY A | AMER CHEMICAL SOC | Published : 2015
Atmospheric amides have primary and secondary sources and are present in ambient air at low pptv levels. To better assess the fate of amides in the atmosphere, the room temperature (298 ± 3 K) rate coefficients of five different amides with OH radicals were determined in a 1 m(3) smog chamber using online proton-transfer-reaction mass spectrometry (PTR-MS). Formamide, the simplest amide, has a rate coefficient of (4.44 ± 0.46) × 10(-12) cm(3) molec(-1) s(-1) against OH, translating to an atmospheric lifetime of ∼1 day. N-methylformamide, N-methylacetamide and propanamide, alkyl versions of formamide, have rate coefficients of (10.1 ± 0.6) × 10(-12), (5.42 ± 0.19) × 10(-12), and (1.78 ± 0.43)..View full abstract
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Awarded by Australian Research Council
The authors acknowledge the Canada Foundation for Innovation and the Ontario Research Fund for infrastructure support and NSERC and Environment Canada for operational support. N.B. would like to thank Vanier Canada Graduate Scholarships for funding. G.d.S. is grateful for support through the Australian Research Council (DP110103889, DP130100862, FT130101304). The authors would also like to thank John Liggio for donating the HNCO source, as well as Gregory Wentworth for help with the ion chromatograph.