Preprints
https://doi.org/10.5194/acp-2021-30
https://doi.org/10.5194/acp-2021-30

  28 Jan 2021

28 Jan 2021

Review status: this preprint is currently under review for the journal ACP.

Interactions of organosulfates with water vapor under sub- and supersaturated conditions

Chao Peng1,2, Patricia N. Razafindrambinina3, Kotiba A. Malek4, Lanxiadi Chen1,2,7, Weigang Wang5, Ru-Jin Huang6, Yuqing Zhang1,2, Xiang Ding1,2, Maofa Ge5, Xinming Wang1,2, Akua A. Asa-Awuku3,4, and Mingjin Tang1,2,7 Chao Peng et al.
  • 1State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • 2CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
  • 3Department of Chemistry and Biochemistry, College of Computer, Mathematical and Natural Sciences, University of Maryland, College Park, MD 20742, USA
  • 4Department of Chemical and Biomolecular Engineering, A. James Clark School of Engineering, University of Maryland, College Park, MD 20742, USA
  • 5State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • 6Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth and Environment, Chinese Academy of Sciences, Xi'an 710061, China
  • 7University of Chinese Academy of Sciences, Beijing 100049, China

Abstract. Organosulfates (OS) are important constituents of secondary organic aerosols, but their hygroscopic properties and cloud condensation nucleation (CCN) activities have not been well understood. In this work we employed three complementary techniques to characterize interactions of several OS with water vapor under sub- and supersaturated conditions. A vapor sorption analyzer was used to measure mass changes of OS samples with RH (0–90 %); among the 11 organosulfates examined, only sodium methyl sulfate (methyl-OS), sodium ethyl sulfate (ethyl-OS), sodium octyl sulfate (octyl-OS) and potassium hydroxyacetone sulfate were found to deliquesce as RH increased, and their mass growth factors at 90 % RH were determined to be 3.652 ± 0.064, 3.575 ± 0.024, 1.591 ± 0.004 and 2.202 ± 0.031. Hygroscopic growth of methyl-, ethyl- and octyl-OS aerosols was also studied using a humidity tandem differential mobility analyzer (H-TDMA); continuous hygroscopic growth was observed, and their growth factors at 90 % RH were determined to be 1.83 ± 0.03, 1.79 ± 0.02 and 1.21 ± 0.02. We further investigated CCN activities of methyl-, ethyl- and octyl-OS aerosols, and their single hygroscopicity parameters (κccn) were determined to be 0.459 ± 0.021, 0.397 ± 0.010 and 0.206 ± 0.008. For methyl- and ethyl-OS aerosols, κccn values agree reasonably well with those derived from H-TDMA measurements (κgf), whereas κccn was found to be significantly larger than κgf for octyl-OS, likely due to both solubility limit and surface tension reduction.

Chao Peng et al.

Status: open (until 25 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-30', Anonymous Referee #1, 17 Feb 2021 reply

Chao Peng et al.

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Short summary
Organosulfates are important constituents in tropospheric aerosol particles, but their hygroscopic properties and cloud condensation nuclei activities are not well understood. In our work, three complementary techniques were employed to investigate the interactions of eleven organosulfates with water vapor under sub- and supersaturated conditions.
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