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Effect of Initial Toluene Concentration on the Photooxidation of Toluene-NOx-Air Mixture -II. Aerosol Formation and Growth  

Lee Young-Mee (한국과학기술연구원 대기자원연구센터)
Bae Gwi-Nam (한국과학기술연구원 대기자원연구센터)
Lee Seung-Bok (한국과학기술연구원 대기자원연구센터)
Kim Min-Cheol (한국과학기술연구원 대기자원연구센터)
Moon Kil-Choo (한국과학기술연구원 대기자원연구센터)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.21, no.1, 2005 , pp. 27-38 More about this Journal
Abstract
An experimental investigation of the gas-phase photooxidation of toluene-NO$_{x}$-air mixtures at sub-ppm concentrations has been carried out in a 6.9 ㎥, indoor smog chamber irradiated by blacklights. Measured parameters in the toluene-NO$_{x}$ experiments included aerosol, $O_3$, NO, NO$_2$, NO$_{x}$ CO, SO$_2$ toluene, and air temperature. The initial toluene concentration ranged from 225 ppb to 991 ppb and the initial concentration ratio of toluene/NO$_{x}$ in ppbC/ppb was in the range of 5～20. It was found that the variation of aerosol number concentration with irradiation time caused by the photooxidation of toluene-NO$_{x}$-air mixtures depended on the initial toluene concentration for similar concentration ratio of toluene/NO$_{x}$. The dependency of initial toluene concentration on the photooxidation of toluene-NO$_{x}$-air mixtures for toluene/NO$_{x}$= 5～6 seemed to be opposite to that for toluene/NO$_{x}$=10～11. The maximum number concentration of aerosols formed by photooxidation and the aerosol yield depended on both initial toluene concentration and initial concentration ratio of toluene/NO$_{x}$. In this study, the aerosol yield, defined as aerosol formed per unit toluene consumed, was found to be 0.01～0.16.und to be 0.01～0.16.
Keywords
Secondary organic aerosol; Photooxidation; Toluene; $-NO_{x}-$; Ozone; Smog chamber;
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