Ambient aerosol formation is influenced by meteorological properties such as temperature and relative humidity.  Temperature, for example, has an effect on the gas to particle partitioning of amine salts.  These salts are formed in areas with high agricultural and transportation emissions, such as in the San Joaquin Valley in central California.  Daily temperatures in the San Joaquin Valley may fluctuate from 5�C to 20�C in winter and 20�C to 40�C in summer.  The dual 90 m3 indoor environmental chambers at UC-Riverside's College of Engineering � Center for Environmental Research and Technology (UCR/CE-CERT) were designed to measure atmospheric processes at various ambient conditions.  A set of well characterized environmental chamber experiments were conducted on three aliphatic amines.  These amines consisted of trimethylamine, diethylamine, and butylamine.  In these experiments, an amine was injected into the environmental chamber followed by an oxidant such as hydroxyl radical (OH) or nitrate radical (NO3).  The experiments were repeated at various static temperatures and temperature ramps ranging from 5�C to 40�C.  The relative humidity was also varied from 0.5% to 40%.  The chemical composition of the gas phase species was measured with a selected ion flow tube � mass spectrometer (SIFT-MS).  A scanning mobility particle sizer (SMPS) was employed to measure the concentration and size distribution of the secondary organic aerosol produced.  The chemical composition of the particle phase was measured with a high resolution � time of flight � aerosol mass spectrometer (HR-ToF-AMS).

Effects of temperature and relative humidity on the formation of secondary organic aerosol from amine precursors

248th National Meeting (2014)

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