title: Water uptake of multicomponent organic mixtures and their influence on hygroscopicity of inorganic salts.
abstract: 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.
authors.affiliation: The Institute of Chemical Physics, School of Chemistry, Beijing Institute of Technology, Beijing 100081, China; Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: The Institute of Chemical Physics, School of Chemistry, Beijing Institute of Technology, Beijing 100081, China; Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Jing
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yucong
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Junling
authors.initials: J
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Shengrui
authors.initials: S
authors.lastname: Tong
authors.affiliation: The Institute of Chemical Physics, School of Chemistry, Beijing Institute of Technology, Beijing 100081, China. Electronic address: yhz@bit.edu.cn.
authors.forename: Yunhong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: gemaofa@iccas.ac.cn.
authors.forename: Maofa
authors.initials: M
authors.lastname: Ge
mesh_terms: D000336:Aerosols / Q000737:chemistry; D000393:Air Pollutants / Q000737:chemistry*; D000645:Ammonium Sulfate / Q000737:chemistry; D008956:Models, Chemical; D012492:Salts / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D017155:Wettability
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D012492:Salts; D014874:Water Pollutants, Chemical; D012965:Sodium Chloride; D000645:Ammonium Sulfate
keywords: Hygroscopicity; Inorganic salts; Multicomponent; Water soluble organic compounds