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Enhanced levels of atmospheric low-molecular weight monocarboxylic acids in gas and particulates over Mt. Tai, North China, during field burning of agricultural wastes

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/75817

Title: Enhanced levels of atmospheric low-molecular weight monocarboxylic acids in gas and particulates over Mt. Tai, North China, during field burning of agricultural wastes
Authors: Mochizuki, Tomoki Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Nakarnura, Shinnosuke Browse this author
Kanaya, Yugo Browse this author
Wang, Zifa Browse this author
Keywords: Acetic acid
Formic acid
Lactic acid
Gas/particle partitioning
Wheat straw burning
North East China
Issue Date: Dec-2017
Publisher: Elsevier
Journal Title: Atmospheric environment
Volume: 171
Start Page: 237
End Page: 247
Publisher DOI: 10.1016/j.atmosenv.2017.10.026
Abstract: To understand the source and atmospheric behaviour of low molecular weight monocarboxylic acids (mono acids), gaseous (G) and particulate (P) organic acids were collected at the summit of Mt. Tai in the North China Plain (NCP) during field burning of agricultural waste (wheat straw). Particulate organic acids were collected with neutral quartz filter whereas gaseous organic acids were collected with KOH-impregnated quartz filter. Normal (C-1-C-10, branched (iC(4)-iC(6)), hydroxy (lactic and glycolic), and aromatic (benzoic) monoacids were determined with a capillary gas chromatography employing p-bromophenacyl esters. We found acetic acid as the most abundant gas-phase species whereas formic acid is the dominant particle-phase species. Concentrations of formic (G/P 1 570/1 410 ng m(-3)) and acetic (3 960/1 120 ng m(-3)) acids significantly increased during the enhanced field burning of agricultural wastes. Concentrations of formic and acetic acids in daytime were found to increase in both G and P phases with those of K+, a field-burning tracer (r = 0.32-0.64). Primary emission and secondary formation of acetic acid is linked with field burning of agricultural wastes. In addition, we found that particle-phase fractions (Fp = P/(G + P)) of formic (0.50) and acetic (0.31) acids are significantly high, indicating that semi-volatile organic acids largely exist as particles. Field burning of agricultural wastes may play an important role in the formation of particulate monoacids in the NCP. High levels (917 ng m(-3)) of particle phase lactic acid, which is characteristic of microorganisms, suggest that microbial activity associated with terrestrial ecosystem significantly contributes to the formation of organic aerosols.
Rights: ©2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/75817
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河村 公隆

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