Role of Ammonia in Aerosol Liquid Water，pH，and Secondary Inorganic Aerosols Formation at an Ammonia-rich City in Changzhou

被引：1
|
作者：
Yu, Yi-Jun [1 ]
Zhuang, Min [1 ]
Wang, Zhen [1 ]
Li, Kai-Ji [1 ]
Yang, Wei-Fen [1 ]
机构：
[1] Jiangsu Changzhou Environmental Monitoring Center, Changzhou,213004, China
来源：
Huanjing Kexue/Environmental Science | 2024年 / 45卷 / 08期
关键词：
Ammonia（NH3）is an important alkaline reactive nitrogen; which; as a precursor of fine particulate matter; raises public health issues. In this study; online NH3; SO2; NO2; PM2.5; and its water-soluble inorganic ions were detected to deduce the influence of NH3 on aerosol liquid water content（AWC）and aerosol pH; including the formation of water-soluble secondary ions in PM2.5 in winter in Changzhou; an ammonia-rich city in the Yangtze River Delta area in winter. The results showed that NH4+ mainly existed in the form of NH4NO3 and（NH4）2SO4; and the remaining NH4+ existed as NH4Cl. Owing to the NH3-NH4+ buffer system; the aerosol pH values were found at 4.2 ± 0.4; which was positively correlated with the NH3 content. The aerosol pH value variation narrowed with the increase in PM2.5 concentration and tended to be between 4 to 5. AWC increased exponentially with the increase in humidity and SNA content; among which NH4NO3; （NH4）2SO4; and NH4Cl contributed 58.5%; 18.4%; and; 8.3%; respectively; due to their hygroscopicity. Aerosol pH; AWC; and NH3-NH4+ conversion promoted the gas-to-particle conversion of SO2 and NO2. In Changzhou; rich NH3-NH4+ were found to maintain relatively high pH values; push up AWC; and promote the heterogeneous reaction of SO2; whereas NO3− generation was dominated by a homogeneous reaction; which was accelerated by NH3. According to the simulation results; relatively noticeable changes in aerosol pH and AWC could be found by the reduction of up to 30% of NH3 © 2024 Science Press. All rights reserved;
D O I：
10.13227/j.hjkx.202309100
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页码：4493 / 4501
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