AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Reaction Pathways of Primary, Secondary and Tertiary Amines with Ozone, Hydroxyl Radical and Nitrate Radical
DEREK PRICE, Xiaochen Tang, David R. Cocker III, Kathleen Purvis-Roberts, Philip Silva, University of California, Riverside
Abstract Number: 179 Working Group: Aerosol Chemistry
Abstract The presence and importance of amines in the atmosphere continues to gain more attention. Common emission sources of aliphatic amines are agricultural facilities. Amine-based control technologies designed to capture NO$_x and CO$_2 from post fossil fuel combustion are a possible source of ammonia and amino alcohols. Determining the reactions of these amines with common atmospheric radicals is important to understanding both daytime and nighttime atmospheric chemistry. A series of well-characterized smog chamber experiments were conducted in which aliphatic and functionalized amines (primary, secondary, tertiary) were reacted with either ozone, hydroxyl radical (OH) or nitrate radical (NO$_3). Chemical composition of the aerosol products was obtained with a High Resolution Time of Flight Aerosol Mass Spectrometer (HR-ToF-AMS) and a Particle Into Liquid Sampler Time of Flight Mass Spectrometer (PILS-ToF-MS). The density and volatility of the aerosol were also measured. Chemical composition of the gas phase products was obtained with a Selected Ion Flow Tube Mass Spectrometer (SIFT-MS). Several reaction pathways were observed. These pathways will be discussed and include the formation of amine salts, the growth of higher mass oligomer-like compounds, as well as the production of nitrosamines and nitramines. The relative importance of each pathway to the overall production of aerosol is dependent on the type of amine and oxidant. For example, trimethylamine produced more organic aerosol compared to diethylamine, which produced more amine salts. Also, the secondary amines formed more nitramines than the tertiary amines when reacted with nitrate radical.