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Hygroscopic properties of levoglucosan and related organic compounds characteristic to biomass burning aerosol particles

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タイトル: Hygroscopic properties of levoglucosan and related organic compounds characteristic to biomass burning aerosol particles
著者: Mochida, Michihiro 著作を一覧する
Kawamura, Kimitaka 著作を一覧する
キーワード: hygroscopic properties
biomass burning aerosol
tandem differential mobility analyzer
発行日: 2004年11月 6日
出版者: American Geophysical Union
誌名: Journal of Geophysical Research
巻: 109
開始ページ: D21202
出版社 DOI: 10.1029/2004JD004962
抄録: Biomass burning, which is characterized by pyrolysis as well as vaporization and condensation of biomass constituents, is a significant source of atmospheric organic aerosols. In this study, hygroscopic properties of five organic compounds (levoglucosan, D-glucose, and vanillic, syringic, and 4-hydroxybenozoic acids), which are major pyrolysis products of wood, were measured using a tandem differential mobility analyzer. Levoglucosan, which is typically the most abundant species in wood burning aerosols, showed a significant hygroscopic growth for particles with a diameter of 100 nm. No efflorescence was observed under the measured relative humidity, and a supersaturated condition of levoglucosan-water particles was observed. The growth factors of levoglucosan are 1.08, 1.18, 1.23, and 1.38 at relative humidity (RH) of 60, 80, 85, and 90%, respectively. The measured hygroscopic curves are in general consistent with those estimated from ideal solution theory and Uniquac Functional-Group Activity Coefficient (UNIFAC) and Conductor-Like Screening Model for Real Solvent (COSMO-RS) methods. Significant hygroscopic growth was also observed for D-glucose, whose growth factor is quite similar to that of levoglucosan. However, three model pyrolysis products of lignin (i.e., vanillic-, syringic-, and 4-hydroxybenzoic acids) did not show any hygroscopic growth under the RH conditions up to 95%. On the basis of the organic composition of wood burning aerosols, the water absorption attributed to levoglucosan in wood burning aerosols is calculated to be up to 30% of the organic mass at 90% RH. This study demonstrates that oxygenated organics emitted from biomass burning could significantly enhance the hygroscopic properties of atmospheric aerosols.
Rights: An edited version of this paper was published by AGU. Copyright 2004, American Geophysical Union, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 109.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/26154
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 河村 公隆

 

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