Hygroscopicity of internally mixed multi-component aerosol particles of atmospheric relevance

被引：46
作者：
Liu, Qifan [1 ]
Jing, Bo [1 ,2 ]
Peng, Chao [1 ]
Tong, Shengrui [1 ]
Wang, Weigang [1 ]
Ge, Maofa [1 ]
机构：
[1] Chinese Acad Sci, State Key Lab Struct Chem Unstable & Stable Speci, Inst Chem, BNLMS, Beijing 100190, Peoples R China
[2] Beijing Inst Technol, Key Lab Cluster Sci, Inst Chem Phys, Beijing 100081, Peoples R China
来源：
ATMOSPHERIC ENVIRONMENT | 2016年 / 125卷
基金：
中国国家自然科学基金;
关键词：
Hygroscopicity; H-TDMA; Phthalic acid; Levoglucosan; Multi-component aerosol particles; AMMONIUM-SULFATE; WATER-UPTAKE; ORGANIC-COMPOUNDS; ACTIVATION DIAMETERS; DICARBOXYLIC-ACIDS; PHASE-TRANSITIONS; GROWTH; DELIQUESCENCE; HAZE; MIXTURES;
D O I：
10.1016/j.atmosenv.2015.11.003
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The hygroscopic properties of two water-soluble organic compounds (WSOCs) relevant to urban haze pollution (phthalic acid and levoglucosan) and their internally mixtures with inorganic salts (ammonium sulfate and ammonium nitrate) are investigated using a hygroscopicity tandem differential mobility analyzer (H-TDMA) system. The multi-component particles uptake water gradually in the range 5-90% relative humidity (RH). The experimental results are compared with the thermodynamic model predictions. For most mixtures, Extended Aerosol Inorganic Model (E-AIM) predictions agree well with the measured growth factors. The hygroscopic growth of mixed particles can be well described by the Zdanovskii-Stokes-Robinson (ZSR) relation as long as the mixed particles are completely liquid. ZSR calculations underestimate the water uptake of mixed particles at moderate RH due to the partial dissolution of ammonium sulfate in the organic and ammonium nitrate solution in this RH region. The phase of ammonium nitrate in the initial dry particles changes dramatically with the composition of mixtures. The presence of organics in the mixed particles can inhibit the crystallization of ammonium nitrate during the drying process and results in water uptake at low RH (RH < 60%). These results demonstrate that certain representative WSOCs can substantially influence the hygroscopicity of inorganic salts and overall water uptake of particles. (c) 2015 Elsevier Ltd. All rights reserved.
引用
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页码：69 / 77
页数：9
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