Gas-Particle Partitioning of Alcohol Vapors on Organic Aerosols

被引:7
作者
Chan, Lap P. [1 ]
Lee, Alex K. Y. [1 ]
Chan, Chak K. [1 ,2 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China
[2] Hong Kong Univ Sci & Technol, Div Environm, Kowloon, Hong Kong, Peoples R China
关键词
ATMOSPHERIC PARTICULATE MATTER; RAMAN-SPECTROSCOPY; HETEROGENEOUS REACTIONS; ELECTRODYNAMIC BALANCE; HYGROSCOPIC PROPERTIES; THERMODYNAMIC APPROACH; WATER ACTIVITIES; SULFURIC-ACID; MODEL; MASS;
D O I
10.1021/es9018018
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Single particle levitation using an electrodynamic balance (EDB) has been found to give accurate and direct hygroscopic measurements (gas-particle partitioning of water) for a number of inorganic and organic aerosol systems. In this paper, we extend the use of an EDB to examine the gas-particle partitioning of volatile to semivolatile alcohols, including methanol, n-butanol, n-octanol, and n-decanol, on levitated oleic acid particles. The measured K(p) agreed with Pankow's absorptive partitioning model. At high n-butanol vapor concentrations (10(3) ppm), the uptake of n-butanol reduced the average molecular-weight of the oleic acid particle appreciably and hence increased the K(p) according to Pankow's equation. Moreover, the hygroscopicity of mixed oleic acid/n-butanol particles was higher than the predictions given by the UNIFAC model (molecular group contribution method) and the ZSR equation (additive rule), presumably due to molecular interactions between the chemical species in the mixed particles. Despite the high vapor concentrations used, these findings warrant further research on the partitioning of atmospheric organic vapors (K(p)) near sources and how collectively they affect the hygroscopic properties of organic aerosols.
引用
收藏
页码:257 / 262
页数:6
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