Effects of particle acidity and UV light on secondary organic aerosol formation from oxidation of aromatics in the absence of NOx

被引：50

作者：

Cao, Gang ^{[1
]}

Jang, Myoseon ^{[1
]}

机构：

[1] Univ N Carolina, Dept Environm Sci & Engn, Chapel Hill, NC 27515 USA

来源：

ATMOSPHERIC ENVIRONMENT | 2007年 / 41卷 / 35期

基金：

美国国家科学基金会;

关键词：

SOA formation; particle acidity; inorganic seed; humidity; UV radiation;

D O I：

10.1016/j.atmosenv.2007.05.034

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Recent laboratory observations have shown that particle acidity increases secondary organic aerosol (SOA) yields. However, these studies have mainly focused on biogenic precursors such as isoprene and terpenes. In this paper, the effects of particle acidity on the SOA yields from aromatic precursors under both dark and UV-visible light conditions were characterized through controlled chamber experiments. SOA was produced from oxidation of toluene and 1,3,5 -trimethylbenzene (135-TMB) with OH radicals created by ozonolysis of 2-methyl-2-butene (MB). Particle acidity, described with proton concentrations, varied with inorganic seed aerosol composition and humidity (20-52%). Overall, in the presence of acidic seeds, greater increases in SOA yields were observed for the toluene system than the 135-TMB system. UV irradiation reduced SOA yields for both toluene and 135-TMB systems to different extents. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：7603 / 7613

页数：11

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