Hygroscopicity of ambient submicron particles in urban Hangzhou,China  

作　　者：Jiachen ZHANG Lin WANG Jianmin CHEN Shengmao FENG Jiandong SHEN Li JIAO 

机构地区：[1]Department of Environmental Science&Engineering,Fudan University,Shanghai 200433,China [2]Research Institute for the Changing Global Environment,Fudan University,Shanghai 200433,China [3]Central Station of Environmental Monitoring,Hangzhou Environmental Protection Bureau,Hangzhou 310012,China

出　　处：《Frontiers of Environmental Science & Engineering》2011年第3期342-347,共6页环境科学与工程前沿（英文）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant Nos.21077025,40875073,40975075,20937001);the Science&Technology Commission of Shanghai Municipality(Nos.09160707700,10231203801,10JC1401600).

摘　　要：In this study,hygroscopicity of size-segregated ambient submicron particles in urban Hangzhou was studied from 28th December 2009 to 18th January 2010,using a hygroscopicity-tandem differential mobility analyzer(H-TDMA).The submicron particles in Hangzhou showed a minor hygroscopic growth at 73%relative humidity(RH),and then grew significantly between 77%and 82%RH.Monomodal distribution accounted for 90%for 30 nm particles,17%for 50 nm particles,and less than 7%for particles larger than 50 nm at 82%RH.Deconvolution of the bimodal distribution indicated a less hygroscopic group and a more hygroscopic group,with the fraction of the more hygroscopic group increasing with the initial dry particle size and then remaining almost constant for accumulation mode particles.Our results imply that submicron particles in urban Hangzhou were almost entirely externally mixed,and the hygroscopic properties of ambient particles in urban Hangzhou were mainly a function of their size and chemical composition.

关 键 词：HYGROSCOPICITY hygroscopic tandem differential mobility analyzer(H-TDMA) submicron ambient particles Hangzhou 

分 类 号：TB3[一般工业技术—材料科学与工程]