Effect of humidity on the composition of isoprene photooxidation secondary organic aerosol

被引:148
作者
Nguyen, T. B. [1 ]
Roach, P. J. [2 ]
Laskin, J. [2 ]
Laskin, A. [3 ]
Nizkorodov, S. A. [1 ]
机构
[1] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA
[2] Pacific NW Natl Lab, Chem & Mat Sci Div, Richland, WA 99352 USA
[3] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA
基金
美国国家科学基金会;
关键词
H-ATOM TRANSFER; MASS-SPECTROMETRY; PARTICULATE MATTER; HETEROGENEOUS REACTIONS; ATMOSPHERIC CHEMISTRY; CHEMICAL-COMPOSITION; ALPHA-PINENE; HYGROSCOPIC PROPERTIES; ACCRETION REACTIONS; ALKOXY RADICALS;
D O I
10.5194/acp-11-6931-2011
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The effect of relative humidity (RH) on the composition and concentrations of gas-phase products and secondary organic aerosol (SOA) generated from the photooxidation of isoprene under high-NOx conditions was investigated. Experiments were performed with hydrogen peroxide as the OH precursor and in the absence of seed aerosol. The relative yields of most gas-phase products were the same regardless of initial water vapor concentration with exception of hydroxyacetone and glycolaldehyde, which were considerably affected by RH. A significant change was observed in the SOA composition, with many unique condensed-phase products formed under humid (90% RH) vs. dry (< 2% RH) conditions, without any detectable effect on the rate and extent of the SOA mass growth. There is a 40% reduction in the number and relative abundance of distinct particle-phase nitrogen-containing organic compounds (NOC) detected by high resolution mass spectrometry. The suppression of condensation reactions, which produce water as a product, is the most important chemical effect of the increased RH. For example, the total signal from oligomeric esters of 2-methylglyceric acid was reduced by about 60% under humid conditions and the maximum oligomer chain lengths were reduced by 7-11 carbons. Oligomers formed by addition mechanisms, without direct involvement of water, also decreased at elevated RH but to a much smaller extent. The observed reduction in the extent of condensation-type oligomerization at high RH may have substantial impact on the phase characteristics and hygroscopicity of the isoprene aerosol. The reduction in the amount of organic nitrates in the particle phase has implications for understanding the budget of NOC compounds.
引用
收藏
页码:6931 / 6944
页数:14
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