Hygroscopicity and optical properties of alkylaminium sulfates  

作　　者：Dawei Hu Chunlin Li Hui Chen Jianmin Chen Xingnan Ye Ling Li Xin Yang Xinming Wang Abdelwahid Mellouki Zhongyang Hu 

机构地区：[1]Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention,Fudan Tyndall Centre,Department of Environmental Science￡Engineering, Fudan University [2]Institut de Combustion, Arothermique, Ractivit et Environnement, Centre National de la Recherche Scientifique [3]Chinese Acad Sci,State Key Laboratory Organ Geochem, Guangzhou Inst Geochem [4]Dionex Corporation

出　　处：《Journal of Environmental Sciences》2014年第1期37-43,共7页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21190053,21177025,20937001);the Shanghai Science and Technology Commission of Shanghai Municipality(No.12DJ1400100,13XD1400700);the Priority Fields for Ph.D.Programs Foundation of Ministry of Education of China(No.20110071130003);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB05010200);FP7 Project(AMIS)(No.PIRSES-GA-2011)

摘　　要：The hygroscopicity and optical properties of alkylaminium sulfates （AASs） were investigated using a hygroscopicity tandem differential mobility analyzer coupled to a cavity ring-down spectrometer and a nephelometer. AAS particles do not exhibit a deliquescence phenomenon and show a monotonic increase in diameter as the relative humidity （RH） ascends. Hygroscopic growth factors （GFs） for 40, 100 and 150 nm alkylaminium sulfate particles do not show an apparent Kelvin effect when RH is less than 45%, whereas GFs of the salt aerosols increase with initial particle size when RH is higher than 45%. Calculation using the Zdanovskii-Stokes-Robinson mixing rule suggests that hygroscopic growth of triethylaminium sulfate-ammonium sulfate mixtures is non-deliquescent, occurring at very low RH, implying that the displacement of ammonia by amine will significantly enhance the hygroscopicity of （NH4）2SO4 aerosols. In addition, light extinction of AAS particles is a combined effect of both scattering and absorption under dry conditions, but is dominated by scattering under wet conditions.The hygroscopicity and optical properties of alkylaminium sulfates （AASs） were investigated using a hygroscopicity tandem differential mobility analyzer coupled to a cavity ring-down spectrometer and a nephelometer. AAS particles do not exhibit a deliquescence phenomenon and show a monotonic increase in diameter as the relative humidity （RH） ascends. Hygroscopic growth factors （GFs） for 40, 100 and 150 nm alkylaminium sulfate particles do not show an apparent Kelvin effect when RH is less than 45%, whereas GFs of the salt aerosols increase with initial particle size when RH is higher than 45%. Calculation using the Zdanovskii-Stokes-Robinson mixing rule suggests that hygroscopic growth of triethylaminium sulfate-ammonium sulfate mixtures is non-deliquescent, occurring at very low RH, implying that the displacement of ammonia by amine will significantly enhance the hygroscopicity of （NH4）2SO4 aerosols. In addition, light extinction of AAS particles is a combined effect of both scattering and absorption under dry conditions, but is dominated by scattering under wet conditions.

关 键 词：hygroscopicity optical properties alkylaminium sulfates 

分 类 号：X701.3[环境科学与工程—环境工程]