Journal article

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

Abstract

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)..

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University of Melbourne Researchers

Grants

Awarded by Australian Research Council


Funding Acknowledgements

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.