|Silva, Philip - Phil|
Submitted to: American Association for Aerosol Research
Publication Type: Abstract only
Publication Acceptance Date: 5/30/2011
Publication Date: 10/7/2011
Citation: Tang, E., Nakao, S., Clark, C.H., Silva, P.J., Brown, R.S., Purvis-Roberts, K., Asa-Akua, A., Cocker, D. 2011. Secondary organic aerosol formation of primary, secondary and tertiary Amines. American Association for Aerosol Research. Abstract. Interpretive Summary:
Technical Abstract: Amines have been widely identified in ambient aerosol in both urban and rural environments and they are potential precursors for formation of nitrogen-containing secondary organic aerosols (SOA). However, the role of amines in SOA formation has not been well studied. In this wrok, we use UC-Riverside’s 12.5 m3 reaction chamber to simulate oxidations of primary (butylamine (BA)), secondary (diethylamine (DEA)), and tertiary (trimethylamine (TMA)) amine oxidation by nitrate radical, hydroxyl radical, and ozone under dry and humid conditions (RH=30-50%). A set of on-line and off-line instruments including Proton Transfer Reaction Mass Spectrometry (PTR-MS), High Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS), and Particle in Liquid Sampler Time-of-Flight Mass Spectrometry (PILS- ToF-MS) are used to monitor evolution of gas- and particle-phase aerosols. For all three types of amines, nitrate radical oxidation resulted in the highest aerosol yield and the lowest bulk aerosol density, while hydroxyl radical oxidation showed the opposite behavior. For both nitrate radical and hydroxyl radical oxidation, the aerosol yield was greatest for TMA and least for BA. Compared to dry-condition experiments, higher RH enhances salt formation, although the SOA was dominated by organic mass. The study could help better understand formation mechanisms of amines and enhance prediction precision of nitrogen-containing compounds using models.