In-situ FTIR Study on the Absorption and Transformation of Glyoxal on the Surface of Dust Particles
SHEN Xiao-li, CHEN Zhong-ming*, ZHAO Yue, HUANG Dao
State Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
Abstract：Glyoxal is one of the most important volatile organic compounds in the atmosphere. The reactions of glyoxal in the gaseous and aqueous phases and on the surfaces of secondary inorganic acidic aerosols can lead to atmospheric secondary organic aerosol (SOA) formation. However, up to now, there is no report on the heterogeneous reaction of glyoxal on dust particles. The present work investigated the heterogeneous absorption and transformation mechanisms of glyoxal on SiO2 and α-Al2O3 particles. The progress of heterogeneous reaction conducted in the flow tube reactor was in situ monitored by transmission Fourier transform Infrared (T-FTIR). The reaction products were analyzed by combining T-FTIR with HPLC, IC, and HPLC-MS. It was found that oligomers form after the glyoxal is absorbed onto the particles (SiO2 and α-Al2O3); and for α-Al2O3, organic acids form on the particle surface in absence of illumination and oxidants. Moreover, it was revealed that water vapor favors the formation of oligomers, but suppresses the production of organic acids. These findings help further understand the SOA formation from the heterogeneous reaction of glyoxal on dust in the atmosphere.
申晓莉，陈忠明*，赵 岳，黄 道 . 乙二醛在沙尘颗粒物表面吸附与转化的红外光谱研究[J]. 光谱学与光谱分析, 2012, 32(11): 2946-2949.
SHEN Xiao-li, CHEN Zhong-ming*, ZHAO Yue, HUANG Dao. In-situ FTIR Study on the Absorption and Transformation of Glyoxal on the Surface of Dust Particles . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(11): 2946-2949.
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