AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Uptake and Transformation of Glyoxal on Mineral Dust Particles
Xiaoli Shen, Yue Zhao, Dao Huang, ZHONGMING CHEN, Peking University
Abstract Number: 428 Working Group: Aerosol Chemistry
Abstract Glyoxal plays a crucial role in the formation of secondary organic aerosols (SOA) because of its plenty and highly reactivity in the atmosphere. The mineral dust particle, a significant constituent of atmospheric particles, may provide a reaction medium for glyoxal. We investigate the uptake and transformation of glyoxal on fresh and acidic gas-aged SiO2, alpha-Al2O3, and CaCO3 particles, as the models of atmospheric mineral dust particles. A series of products, including oligomers, organosulfate and organic acids, which can contribute to SOA, are detected. It is found that water vapor favors the uptake of glyoxal, and the formation of oligomers and organosulfate, whereas suppresses the formation of organic acids. This finding demonstrates that the mineral dust particle has a special reactivity towards glyoxal.