| Title: | Secondary organic aerosol formation from photooxidation of C(3)H(6) under the presence of NH(3): Effects of seed particles |
| Author(s): | Wang Y; Cui S; Fu X; Zhang Y; Wang J; Fu P; Ge X; Li H; Wang X; |
| Address: | "Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing, 210044, China; School of Environmental Sciences and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China. Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, 300072, China. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing, 210044, China; School of Environmental Sciences and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China. Electronic address: haiwei.li@nuist.edu.cn. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China. Electronic address: wangxm@gig.ac.cn" |
| DOI: | 10.1016/j.envres.2022.113064 |
| ISSN/ISBN: | 1096-0953 (Electronic) 0013-9351 (Linking) |
| Abstract: | "Frequently-occurred secondary organic aerosols (SOAs) under low-NO(x) conditions contribute to the winter haze episodes and remain unclear in the abundant presence of NH(3). Here, the effects of CaCl(2) seed particles on the photooxidation of low-molecular-weight C(3)H(6) with co-existing NO(2) and NH(3) were highlighted and investigated through a chamber-simulation study equipped with high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS). The influences of NH(3) are often overestimated to exclusively enhance SOA yields under a low-[NO(2)](0) condition. Instead, the seeds played a central role in the heterogeneous formation of SOAs in this reaction with two orders of magnitudes higher than that in the absence of seeds at relative humidity (RH) of 82%. Interestedly, the O(3) production was unchanged whether the seeds existed or not, small changes in the production of O(3) were observed whether the seeds existed or not, indicating that the gas-phase conversions of C(3)H(6) and NO(x) into C1-C3 oxygenated volatile organic compounds (OVOCs) and nitrogen-containing compounds (NOCs) were not affected by seed particles. Given that the ensuing formation of these low-volatile compounds was condensed into nucleation on the seeds, the explosive growth of C(3)H(6) SOAs was then stimulated in the addition of NH(3). Besides NO(2) photolysis, the producing O(3) was related to the formation of secondary carbonyls such as formaldehyde and then was consumed in the .OH generation of approximately 3.40 x 10(-12) molecules cm(-3). This study provides a new insight to better understand the new gas-to-particle formation mechanisms when the haze pollution outbreaks in the complex air mixture" |
| Keywords: | Aerosols *Air Pollutants/analysis Nitrogen Dioxide Photolysis *Volatile Organic Compounds Ammonia Chamber simulations Propene photooxidation SOAs Seed particles; |
| Notes: | "MedlineWang, Yuan Cui, Shijie Fu, Xuewei Zhang, Yunjiang Wang, Junfeng Fu, Pingqing Ge, Xinlei Li, Haiwei Wang, Xinming eng Research Support, Non-U.S. Gov't Netherlands 2022/03/11 Environ Res. 2022 Aug; 211:113064. doi: 10.1016/j.envres.2022.113064. Epub 2022 Mar 8" |
