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Monogr. Environ. Earth Planets, Vol. 4 (No. 1), pp. 1-45, 2016 doi:10.5047/meep.2016.00401.0001 ISSN: 2186-4853

Fundamental Heterogeneous Reaction Chemistry Related to Secondary Organic Aerosols (SOA) in the Atmosphere

Hajime Akimoto

Center for Global Environmental Research, National Institute for Environmental Studies (NIES),
16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Asia Center for Air Pollution Research (ACAP)∗∗, 1182 Sowa, Nishi-ku, Niigata 950-2144, Japan
Present affiliation as Visiting Scientist.
∗∗A part of the work was carried out here until March 31, 2015.

(Received July 7, 2015; Revised April 8, 2016; Accepted April 8, 2016; Online published November 11, 2016)

Citation: Akimoto, H. (2016), Fundamental heterogeneous reaction chemistry related to secondary organic aerosols (SOA) in the atmosphere, Monogr. Environ. Earth Planets, 4, 1-45, doi:10.5047/meep.2016.00401.0001.

Abstract: Typical reaction pathways of formation of dicarboxylic acids, larger multifunctional compounds, oligomers, and organosulfur and organonitrogen compounds in secondary organic aerosols (SOA), revealed by laboratory experimental studies are reviewed with a short introduction to field observations. In most of the reactions forming these compounds, glyoxal, methyl glyoxal and related difunctional carbonyl compounds play an important role as precursors, and so their formation pathways in the gas phase are discussed first. A substantial discussion is then presented for the OH-initiated aqueous phase radical oxidation reactions of glyoxal and other carbonyls which form dicarboxylic acids, larger multifunctional compounds and oligomers, and aqueous-phase non-radical reactions which form oligomers, organosulfates and organonitrogen compounds. Finally, the heterogeneous oxidation reaction of gaseous O3, OH and NO3 with liquid and solid organic aerosols at the air-particle interface is discussed relating to the aging of SOA in the atmosphere.

Keywords: Secondary organic aerosols, Heterogeneous reactions, Multiphase reactions, Aqueous phase organic reactions, Dicarboxylic acids, Oligomers, Organic sulfur, Organic nitrogen.


Corresponding author e-mail: akimoto.hajime@nies.go.jp


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