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

中图分类号：

学科分类号：

摘要：

引用

页码：4493 / 4501

共 26 条

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