TY - JOUR
T1 - Nitrate-Enhanced Gas-to-Particle-Phase Partitioning of Water-Soluble Organic Compounds in Chinese Urban Atmosphere
T2 - Implications for Secondary Organic Aerosol Formation
AU - Lv, Shaojun
AU - Wu, Can
AU - Wang, Fanglin
AU - Liu, Xiaodi
AU - Zhang, Si
AU - Chen, Yubao
AU - Zhang, Fan
AU - Yang, Yi
AU - Wang, Hongli
AU - Huang, Cheng
AU - Fu, Qingyan
AU - Duan, Yusen
AU - Wang, Gehui
N1 - Publisher Copyright:
© 2022 American Chemical Society.
PY - 2023/1/10
Y1 - 2023/1/10
N2 - To understand the gas-to-particle-phase partitioning process of water-soluble organic compounds (WSOCs) in the atmosphere, we conducted simultaneous measurements of gaseous WSOCs and particulate WSOCs in Shanghai during the summer of 2020. We found that pollution events (PEs) of PM2.5 during the campaign can be classified as sulfate-dominated (SD) or nitrate-dominated (ND) episodes. The gas-to-particle-phase partitioning coefficients (Fp) of WSOCs during ND episodes (0.36 ± 0.04) were 40% higher than those during SD episodes (0.25 ± 0.05). These results were largely driven by aerosol liquid water content and aerosol acidity during ND and SD episodes, respectively. Such bulk-level results are consistent with the partitioning behaviors of oxalic acid molecules during the PEs, demonstrating that the kinetics of the partitioning process differed for the two types of PEs. The thermodynamic model simulation for Fp and the trend analysis for PM2.5 composition revealed that the efficiency of the gas-to-particle-phase partitioning of atmospheric WSOCs throughout China in the past 20 years has increased with the increasing abundance of nitrate relative to sulfate, indicating that the formation of secondary organic aerosols in China will be more efficient in the near future because of the increasingly efficient partitioning of WSOCs.
AB - To understand the gas-to-particle-phase partitioning process of water-soluble organic compounds (WSOCs) in the atmosphere, we conducted simultaneous measurements of gaseous WSOCs and particulate WSOCs in Shanghai during the summer of 2020. We found that pollution events (PEs) of PM2.5 during the campaign can be classified as sulfate-dominated (SD) or nitrate-dominated (ND) episodes. The gas-to-particle-phase partitioning coefficients (Fp) of WSOCs during ND episodes (0.36 ± 0.04) were 40% higher than those during SD episodes (0.25 ± 0.05). These results were largely driven by aerosol liquid water content and aerosol acidity during ND and SD episodes, respectively. Such bulk-level results are consistent with the partitioning behaviors of oxalic acid molecules during the PEs, demonstrating that the kinetics of the partitioning process differed for the two types of PEs. The thermodynamic model simulation for Fp and the trend analysis for PM2.5 composition revealed that the efficiency of the gas-to-particle-phase partitioning of atmospheric WSOCs throughout China in the past 20 years has increased with the increasing abundance of nitrate relative to sulfate, indicating that the formation of secondary organic aerosols in China will be more efficient in the near future because of the increasingly efficient partitioning of WSOCs.
KW - Acidity
KW - Aerosol liquid water content
KW - Aqueous-phase reactions
KW - Secondary organic aerosols
KW - Sulfate- and nitrate-dominated haze particles
UR - https://www.scopus.com/pages/publications/85145572135
U2 - 10.1021/acs.estlett.2c00894
DO - 10.1021/acs.estlett.2c00894
M3 - 文章
AN - SCOPUS:85145572135
SN - 2328-8930
VL - 10
SP - 14
EP - 20
JO - Environmental Science and Technology Letters
JF - Environmental Science and Technology Letters
IS - 1
ER -