AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
A Simple and Fast Approach to Determine Aldehyde-amine Reactions of Trace Compounds in the Atmosphere by Mass Spectrometry
GEOFFROY DUPORTE, Jevgeni Parshintsev, Luis Barreira, Kari Hartonen, Marja-Liisa Riekkola, University of Helsinki
Abstract Number: 658 Working Group: Aerosol Chemistry
Abstract Amines are emitted to the atmosphere from industry, combustion, biomass burning, animal husbandry and oceans. In addition, soil and vegetation act as important sources of amines, especially during periods with high biological activity. Despite the high vapor pressures of low-molecular weight amines, these compounds can affect the chemistry and lifecycle of atmospheric aerosols, especially due to their unique acid-neutralizing capacity. The reactions between amines and organic acids or carbonyl compounds may contribute to nanoparticle growth, and more knowledge is needed to estimate their role in the chemistry and lifecycle of atmospheric aerosols.
In this context, the objective of this study was to provide mechanistic data describing amine reactivity with oxidation products of monoterpenes, to improve our understanding of amines reactions in the atmosphere and assess the potential of these reactions in the formation and growth of secondary organic aerosols.
In this work, the reactivity between amine and aldehyde was investigated by a simple and fast approach, based on mass spectrometry. The original approach proposed here is based on the chemical analysis at the molecular level of both volatile and condensable products. This approach allows to study elementary reactions in highly controlled and repeatable conditions.
New products were determined and identified for the first time in this study and mechanistic pathways for aldehyde-amine reactions are proposed. Atmospheric implications of these results will be discussed. Currently, a sampling campaign is being conducted in the boreal forest at Hyytiälä, in Finland, in order to identify these compounds under ambient conditions.