Investigating the effect of volatility on the hygroscopicities of acetate nanoparticle aerosols by surface plasmon resonance microscopy  

作　　者：Bo Yang Zhibo Xie Jianguo Liu Huaqiao Gui Jiaoshi Zhang Xiuli Wei Zetao Fan Douguo Zhang 

机构地区：[1]Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China [2]University of Science and Technology of China,Hefei 230026,China [3]CAS Center for Excellence in Regional Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [4]Advanced Laser Technology Laboratory of Anhui Province,Department of Optics and Optical Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Journal of Environmental Sciences》2024年第4期167-178,共12页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41905028,91544218,12134013,and 62127818);the National Key Researchand Development Program of China(No.2017YFC0209504);Anhui Provincial Natural Science Foundation(Nos.1908085MD114 and 2108085MD139);the Hefei Municipal Natural Science Foundation(No.2021007);the Key Research&Development program of Anhui Province(No.202104a05020010);the HFIPS Director’s Fund(Nos.YZJJ2022QN04 and BJPY2021A04)。

摘　　要：Under high relative humidity(RH)conditions,the release of volatile components(such as acetate)has a significant impact on the aerosol hygroscopicity.In this work,one surface plasmon resonance microscopy(SPRM)measurement system was introduced to determine the hygroscopic growth factors(GFs)of three acetate aerosols separately or mixed with glucose at different RHs.For Ca(CH_(3)COO)_(2) or Mg(CH_(3)COO)_(2) aerosols,the hygroscopic growth trend of each time was lower than that of the previous time in three cyclic humidification from 70% RH to 90% RH,which may be due to the volatility of acetic acid leading to the formation of insoluble hydroxide(Ca(OH)_(2) or Mg(OH)_(2))under high RH conditions.Then the third calculated GF(using the Zdanovskii-Stokes-Robinson method)for Ca(CH_(3)COO)_(2) or Mg(CH_(3)COO)_(2) in bicomponent aerosols with 1:1 mass ratio were 3.20% or 5.33% lower than that of the first calculated GF at 90% RH.The calculated results also showed that the hygroscopicity change of bicomponent aerosol was negatively correlated with glucose content,especially when the mass ratio of Mg(CH_(3)COO)_(2) to glucose was 1:2,the GF at 90% RH only decreased by4.67% after three cyclic humidification.Inductively coupled plasma atomic emission spectrum(ICP-AES)based measurements also indicated that the changes of Mg^(2+)concentration in bicomponent was lower than that of the single-component.The results of this study reveal thatduring the efflorescence transitions of atmospheric nanoparticles,the organic acids diffusion rate may be inhibited by the coating effect of neutral organic components,and the particles aging cycle will be prolonged.

关 键 词：Hygroscopic growth VOLATILITY Acetate aerosols Nanoparticle aerosol Surface plasmon resonance 

分 类 号：X513[环境科学与工程—环境工程]