Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1081
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
21 Dec 2016
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Mixing state of oxalic acid containing particles in the rural area of Pearl River Delta, China: implication for seasonal formation mechanism of Secondary Organic Aerosol (SOA)
Chunlei Cheng1,2, Mei Li1,2, Chak K. Chan3, Haijie Tong4, Changhong Chen5, Duohong Chen6, Dui Wu1,2, Lei Li1,2, Peng Cheng1,2, Wei Gao1,2, Zhengxu Huang1,2, Xue Li1,2, Zhong Fu7, Yanru Bi7, and Zhen Zhou1,2 1Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 510632, China
2Guangdong Provincial Engineering Research Center for on - line source apportionment system of air pollution, Guangzhou 510632, China
3School of Energy and Environment, City University of Hong Kong, Hong Kong, China
4Max Planck Institute for Chemistry, Multiphase Chemistry Department, Hahn-Meitner-Weg 1, 55128 Mainz, Germany
5State of Environmental Protection Key Laboratory of the formation and prevention of urban air pollution complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China
6State Environmental Protection Key Laboratory of Regional Air Quality Monitoring, Guangdong Environmental Monitoring Center, Guangzhou, 510308, China
7Guangzhou Hexin Analytical Instrument Limited Company, Guangzhou 510530, China
Abstract. The formation of oxalic acid and its mixing state in atmospheric particulate matter (PM) were studied using a single particle aerosol mass spectrometer (SPAMS) in the summer and winter of 2014 in Heshan, a supersite in the rural area of the Pearl River Delta (PRD) region in China. Oxalic acid-containing particles accounted for 2.5 % and 2.7 % in total detected ambient particles in summer and winter, respectively. Oxalic acid was measured in particles classified as elemental carbon (EC), organic carbon (OC), elemental and organic carbon (ECOC), biomass burning (BB), heavy metal (HM), secondary (Sec), sodium-potassium (NaK) and dust. Oxalic acid was found predominantly mixing with sulfate and nitrate during the whole sampling period, likely due to aqueous phase reactions. In summer, oxalic acid-containing particle number and ozone concentration followed a very similar trend, which may reflect the significant contribution of photochemical reactions to oxalic acid formation. Furthermore, favorable in-situ pH (2–4) conditions were observed, which promote Fenton like reactions for efficient production of •OH in HM type particles. A mechanism in which products of photochemical oxidation of VOCs partitioned into the aqueous phase of HM particles, followed by multistep oxidation of •OH through Fenton like reactions to form oxalic acid is proposed. In wintertime, carbonaceous type particles contained a substantial amount of oxalic acid as well as abundant carbon clusters and biomass burning markers. The general existence of nitric acid in oxalic acid-containing particles indicates an acidic environment during the formation process of oxalic acid. Organosulfate-containing particles well correlated with oxalic acid-containing particles during the episode, which suggests the formation of oxalic acid is closely associated with acid-catalyzed reactions of organic precursors.

Citation: Cheng, C., Li, M., Chan, C. K., Tong, H., Chen, C., Chen, D., Wu, D., Li, L., Cheng, P., Gao, W., Huang, Z., Li, X., Fu, Z., Bi, Y., and Zhou, Z.: Mixing state of oxalic acid containing particles in the rural area of Pearl River Delta, China: implication for seasonal formation mechanism of Secondary Organic Aerosol (SOA), Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1081, in review, 2016.
Chunlei Cheng et al.
Chunlei Cheng et al.
Chunlei Cheng et al.

Viewed

Total article views: 290 (including HTML, PDF, and XML)

HTML PDF XML Total Supplement BibTeX EndNote
205 69 16 290 8 8 34

Views and downloads (calculated since 21 Dec 2016)

Cumulative views and downloads (calculated since 21 Dec 2016)

Viewed (geographical distribution)

Total article views: 290 (including HTML, PDF, and XML)

Thereof 290 with geography defined and 0 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 29 Mar 2017
Publications Copernicus
Download
Share