Water uptake of multicomponent organic mixtures and their influence on hygroscopicity of inorganic salts

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• 作者：Yuanyuan Wang¹ ; ² ; ³ ; Bo Jing¹ ; ² ; ³ ; Yucong Guo² ; Junling Li² ; Shengrui Tong² ; Yunhong Zhang¹ ; ^{yhz@bit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Maofa Ge² ; ^{gemaofa@iccas.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Hygroscopicity ; Multicomponent ; Water soluble organic compounds ; Inorganic salts
• 刊名：Journal of Environmental Sciences
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：45
• 期：Complete
• 页码：156-163
• 全文大小：524 K

文摘

The hygroscopic behaviors of atmospherically relevant multicomponent water soluble organic compounds (WSOCs) and their effects on ammonium sulfate (AS) and sodium chloride were investigated using a hygroscopicity tandem differential mobility analyzer (HTDMA) in the relative humidity (RH) range of 5%–90%. The measured hygroscopic growth was compared with predictions from the Extended-Aerosol Inorganics Model (E-AIM) and Zdanovskii–Stokes–Robinson (ZSR) method. The equal mass multicomponent WSOCs mixture containing levoglucosan, succinic acid, phthalic acid and humic acid showed gradual water uptake without obvious phase change over the whole RH range. It was found that the organic content played an important role in the water uptake of mixed particles. When organic content was dominant in the mixture (75%), the measured hygroscopic growth was higher than predictions from the E-AIM or ZSR relation, especially under high RH conditions. For mass fractions of organics not larger than 50%, the hygroscopic growth of mixtures was in good agreement with model predictions. The influence of interactions between inorganic and organic components on the hygroscopicity of mixed particles was related to the salt type and organic content. These results could contribute to understanding of the hygroscopic behaviors of multicomponent aerosol particles.