| Title: | PM(2.5)-bound silicon-containing secondary organic aerosols (Si-SOA) in Beijing ambient air |
| Author(s): | Xu J; Harrison RM; Song C; Hou S; Wei L; Fu P; Li H; Li W; Shi Z; |
| Address: | "School of Geography Earth and Environmental Science, University of Birmingham, Birmingham, B15 2TT, UK; Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK. Electronic address: jingsha.xu@warwick.ac.uk. School of Geography Earth and Environmental Science, University of Birmingham, Birmingham, B15 2TT, UK; Department of Environmental Sciences/Center of Excellence in Environmental Studies, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia. School of Geography Earth and Environmental Science, University of Birmingham, Birmingham, B15 2TT, UK. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China. Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China. Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. Department of Earth and Atmospheric Sciences, Zhejiang University, Hangzhou, 310027, China. School of Geography Earth and Environmental Science, University of Birmingham, Birmingham, B15 2TT, UK. Electronic address: Z.Shi@bham.ac.uk" |
| DOI: | 10.1016/j.chemosphere.2021.132377 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Volatile methyl siloxanes (VMS) have been widely used in personal care products and industrial applications, and are an important component of VOCs (volatile organic compounds) indoors. They have sufficiently long lifetimes to undergo long-range transport and to form secondary aerosols through atmospheric oxidation. To investigate these silicon-containing secondary organic aerosols (Si-SOA), we collected PM(2.5) samples during 8th-21st August 2018 (summer) and 3rd-23rd January 2019 (winter) at an urban site of Beijing. As the oxidation of VMS mainly results in hydrophilic polar semi-volatile and non-volatile oxidation products, the differences between total water-soluble Si and total water-soluble inorganic Si were used to estimate water-soluble organic Si, considered to be secondary organic Si (SO-Si). The average concentrations of SO-Si during the summer and winter campaigns were 4.6 +/- 3.7 and 13.2 +/- 8.6 ng m(-3), accounting for approximately 80.1 +/- 10.1% and 80.2 +/- 8.7% of the total water-soluble Si, and 1.2 +/- 1.2% and 5.0 +/- 6.9% of total Si in PM(2.5), respectively. The estimated Si-SOA concentrations were 12.7 +/- 10.2 ng m(-3) and 36.6 +/- 23.9 ng m(-3) on average in summer and winter, which accounted for 0.06 +/- 0.07% and 0.16 +/- 0.22% of PM(2.5) mass, but increased to 0.26% and 0.92% on certain days. We found that net solar radiation is positively correlated with SO-Si levels in the summer but not in winter, suggesting seasonally different formation mechanisms" |
| Keywords: | Aerosols/analysis *Air Pollutants/analysis Beijing Environmental Monitoring Particulate Matter/analysis Silicon *Volatile Organic Compounds/analysis Pm(2.5) Secondary organic aerosol Volatile methylsiloxanes; |
| Notes: | "MedlineXu, Jingsha Harrison, Roy M Song, Congbo Hou, Siqi Wei, Lianfang Fu, Pingqing Li, Hong Li, Weijun Shi, Zongbo eng England 2021/10/03 Chemosphere. 2022 Feb; 288(Pt 1):132377. doi: 10.1016/j.chemosphere.2021.132377. Epub 2021 Sep 29" |
