Liquid-liquid phase separation in secondary organic aerosol particles produced from α-pinene ozonolysis and α-pinene photooxidation with/without ammonia

被引：16
|
作者：
Ham, Suhan [1 ]
Babar, Zaeem Bin [2 ]
Lee, Jae Bong [3 ]
Lim, Ho-Jin [2 ]
Song, Mijung [1 ]
机构：
[1] Chonbuk Natl Univ, Dept Earth & Environm Sci, 567 Baekje Daero, Jeonju Si 54896, Jeollabuk Do, South Korea
[2] Kyungpook Natl Univ, Dept Environm Engn, 80 Daehakro, Daegu 41566, South Korea
[3] Korea Atom Energy Res Inst, Reactor Syst Safety Res Div, 989-111 Daedeok Daero, Daejeon 34057, South Korea
来源：
ATMOSPHERIC CHEMISTRY AND PHYSICS | 2019年 / 19卷 / 14期
基金：
新加坡国家研究基金会;
关键词：
RELATIVE HUMIDITIES; CHEMICAL-COMPOSITION; HEALTH; NUCLEATION; SULFATE; DELIQUESCENCE; DEPENDENCE; MORPHOLOGY; CHEMISTRY; NITROGEN;
D O I：
10.5194/acp-19-9321-2019
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Recently, liquid-liquid phase separation (LLPS) of secondary organic aerosol (SOA) particles free of inorganic salts has been intensively studied due to the importance of cloud condensation nuclei (CCN) properties. In this study, we investigated LLPS in four different types of SOA particles generated from alpha-pinene ozonolysis and alpha-pinene photooxidation in the absence and presence of ammonia (NH3). LLPS was observed in SOA particles produced from alpha-pinene ozonolysis at similar to 95.8% relative humidity (RH) and alpha-pinene ozonolysis with NH3 at similar to 95.4% RH. However, LLPS was not observed in SOA particles produced from alpha-pinene photooxidation and alpha-pinene photooxidation with NH3. Based on datasets of the average oxygen to carbon elemental ratio (O : C) for different types of SOA particles from this study and from previous studies, there appears to be a relationship between the occurrence of LLPS and the O : C of the SOA particles. When LLPS was observed, the two liquid phases were present up to similar to 100% RH. This result can help more accurately predict the CCN properties of organic aerosol particles.
引用
收藏
页码：9321 / 9331
页数：11
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