Chenxi Zhang  1,2, Xuesong Cao2, Xiaomin Sun2, Hengjun Peng  3

1 College of Biological and Environmental Engineering, Binzhou University, Binzhou 256600, China
2 Environment Research Institute, Shandong University, Qingdao 266200, China
3 Logistics support department, Shandong University, Jinan 250100, China

Received: November 19, 2020
Revised: February 18, 2021
Accepted: March 2, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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Zhang, C., Cao, X., Sun, X., Peng, H. (2021). Study on the Formation of Secondary Organic Aerosol by Ozonolysis of Citral in the Atmosphere. Aerosol Air Qual. Res.




Understanding secondary organic aerosol (SOA) formation mechanisms is a major focus of atmospheric chemistry research. A large variety of low volatile organic compounds have been detected in SOA generated from the ozonolysis of monoterpenes. In this article, quantum chemistry and kinetic calculations are used to study the mechanism of Citral ozonolysis. The reaction starts from the formation of primary ozonides (POZs), which can decompose to Criegee intermediates (CIs). CIs have previously been implicated in tropospheric oxidation, but most of them are the simplest compounds in the class, such as CH2OO· or CH3CHOO·. In the present study, the production of larger CIs and their reaction kinetics with H2O, NO and SO2 are reported. CIs have been shown to oxidize NO and SO2, leading to the production of nitric acid and sulfuric acid via NO2 and SO3 formation. Reaction with H2O and SO2 may be the dominant pathway for tropospheric removal of CIs and determine their atmospheric concentration. The ozonolysis of Citral can produce low volatile organic compounds, including aldehydes (−C(=O)H), ketones (−C(=O)−), alcohols (−OH), and hydroperoxides (−OOH), which can form SOA by nucleation, condensation, and/or partitioning between the condensed and gaseous phases.

Keywords: Secondary organic aerosol, Citral, Ozonolysis, Criegee intermediates

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