期刊
ACS EARTH AND SPACE CHEMISTRY
卷 4, 期 7, 页码 1029-1038出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsearthspacechem.0c00059
关键词
PAHs; SOA; sea surface; photosensitized reactions; sodium halide ions; kinetics; SESI-HRMS; UV-vis spectra
资金
- National Natural Science Foundation of China [41773131, 41977187]
- Chinese Academy of Science, International Cooperation grant [132744KYSB20190007]
- Guangdong Foundation for Program of Science and Technology Research [2017B030314057]
The photochemical transformation processes occurring at the sea surface lead to the formation of low volatility organic compounds that contribute to new particle formation in the marine boundary layer. Here, we suggest an alternative formation pathway of organosulfur and oxygenated aliphatic compounds, initiated by sunlight-activated fluorene (FL) and dimethylsulfoxide (DMSO) in the presence of the halide ions Cl-, Br-, and I-. In particular, we observe a prompt formation of four typical precursors of secondary organic aerosols, methanesulfonic acid (CH3SO3H), methanesulfinic acid (CH3SO2H), hydroxymethanesulfonic acid (CH4O4S, MSAOH), and 2-hydroxyethenesulfonic acid (C2H5O4SH), upon light irradiation of FL/DMSO. The photochemical modeling shows that in the summer period, MSAOH would be formed in just a few hours under fair-weather conditions, which makes the photosensitized chemistry of FL toward DMSO potentially significant. We also show that the sunlight- initiated degradation of FL is considerably faster in the presence of halide ions, compared to its photochemical degradation in the dilute aqueous phase. Therefore, the photochemical degradation of FL and potentially other polycyclic aromatic hydrocarbons would be faster in high ionic strength aerosol particles, compared to analogous diluted aqueous-phase photochemical processes occurring in, for example, clouds. This could considerably affect the absorbing properties of the aerosols, which should be considered in future modeling studies.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据