Hygroscopicity of ambient submicron particles in urban Hangzhou, China |
| |
Authors: | Jiachen Zhang Lin Wang Jianmin Chen Shengmao Feng Jiandong Shen and Li Jiao |
| |
Institution: | (1) Research Center for Biomolecular Nanotechnology, Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwangju, 500-712, Republic of Korea;(2) National Institute for Occupational Safety and Health/Spokane Research Lab, Spokane, WA 99207, USA |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|