1University of California-Riverside, Bourns College of Engineering, Department of Chemical and Environmental Engineering, Riverside, CA 92521-0001, USA
2Bourns College of Engineering-Center for Environmental Research and Technology (CE-CERT), Riverside, CA, USA
3Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hall, Logan, UT 84322-0300, USA
*now at: Kent State University, Department of Chemistry, Kent, OH 44242, USA
**now at: United States Department of Agriculture, USDA-ARS, 230 Bennett Lane, Bowling Green, KY 42104, USA
Abstract. Primary aliphatic amines are an important class of nitrogen containing compounds emitted from automobiles, waste treatment facilities and agricultural animal operations. A series of experiments conducted at the UC-Riverside/CE-CERT Environmental Chamber is presented in which oxidation of methylamine, ethylamine, propylamine, and butylamine with O3 and NO3 have been investigated. Very little aerosol formation is observed in the presence of O3 only. However, after addition of NO, and by extension NO3, large aerosol mass yields (~44% for butylamine) are seen. Aerosol generated was determined to be organic in nature due to the small fraction of NO and NO2 in the total signal (<1% for all amines tested) as detected by an aerosol mass spectrometer (AMS). We propose a reaction mechanism between carbonyl containing species and the parent amine leading to formation of particulate imine products. These findings can have significant impacts on rural communities with elevated nighttime PM loadings, when significant levels of NO3 exist.