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Discussion papers
https://doi.org/10.5194/acp-2018-1119
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1119
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 03 Dec 2018

Research article | 03 Dec 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Characterization of urban amine-containing particles in Southwestern China: seasonal variation, source, and processing

Yang Chen1,2, Mi Tian1, Rujin Huang2, Guangming Shi4, Huanbo Wang1, Chao Peng1, Junji Cao2, Qiyuan Wang2, Shumin Zhang3, Dongmei Guo3, Leiming Zhang5, and Fumo Yang1,4 Yang Chen et al.
  • 1Research Center for Atmospheric Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
  • 2Key Lab of Aerosol Chemistry & Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
  • 3School of Basic Medical Sciences, North Sichuan Medical College, Nanchong 637000, Sichuan, China
  • 4College of Architecture and Environment, Sichuan University, Chengdu 610065, China
  • 5Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto M3H 5T4, Canada

Abstract. Amine-containing particles were characterized in an urban area of Chongqing during both summer and winter using a single particle aerosol mass spectrometer (SPAMS). Among the collected ambient particles, 12.7% were amine-containing in winter and 8.3% in summer. Amines were observed to internally mix with elemental carbon (EC), organic carbon (OC), sulfate, and nitrate. Diethylamine (DEA) was the most abundant in both number and peak area among amine-containing particles. Wintertime amine-containing particles were mainly from the northwest direction where a forest park was located; in summer, they were from the northwest and southwest (traffic hub) directions. These origins suggest that vegetation and traffic were the primary sources of particulate amines. The average relative peak area of DEA depended strongly on humidity, indicating that the enhancement of DEA was possibly due to increasing aerosol water content and aerosol acidity. Using an adaptive resonance theory neural network (ART-2a) algorithm, four major types of amine-containing particles were clustered including amine-organic-carbon (A-OC), A-OCEC, DEA-OC, and A-OCEC-aged. The identified particle types imply that amine was uptaken by particles produced from traffic and biomass burning. Knowledge gained in this study is helpful to understand the atmospheric processing, origin, and sources of amine-containing particles in the urban area of Chongqing.

Yang Chen et al.
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Short summary
Amine-containing particles were characterized in an urban area of Chongqing during both summer and winter using a single particle aerosol mass spectrometer (SPAMS). Amines were observed to internally mix with elemental carbon (EC), organic carbon (OC), sulfate, and nitrate. Diethylamine (DEA) was the most abundant in both number and peak area among amine-containing particles. vegetation and traffic were the primary sources of particulate amines.
Amine-containing particles were characterized in an urban area of Chongqing during both summer...
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