Preprints
https://doi.org/10.5194/acp-2023-43
https://doi.org/10.5194/acp-2023-43
30 Jan 2023
 | 30 Jan 2023
Status: this preprint is currently under review for the journal ACP.

Saturation vapor pressure characterization of selected low-volatility organic compounds using a residence time chamber

Zijun Li, Noora Hyttinen, Miika Vainikka, Olli-Pekka Tikkasalo, Siegfried Schobesberger, and Taina Yli-Juuti

Abstract. Saturation vapor pressure (psat) is an important thermodynamic property regulating the gas-to-particle partitioning of organic compounds in the atmosphere. Low-volatility organic compounds (LVOCs), with sufficiently low psat values, primarily stay in the particle phase and contribute to aerosol formation. Accurate information on the psat of LVOCs would require volatility measurements performed at temperatures relevant to atmospheric aerosol formation. Here, we present an isothermal evaporation method using a residence time chamber to measure psat for dry, single-compound nanoparticles at 295 K. Our method is able to characterize organic compounds with psat spanning from 10–8 to 10–4 Pa at 295 K. The compounds included four polyethylene glycols (PEG: PEG6, PEG7, PEG8 and PEG9), two monocarboxylic acids (palmitic acid and stearic acid), two dicarboxylic acids (azelaic acid and sebacic acid), two alcohols (meso-erythritol and xylitol), and di-2-ethylhexyl sebacate (DEHS). There was a good agreement between our measured psat values and those reported by previous volatility studies using different measurement techniques, mostly within one order of magnitude. Additionally, quantum-chemistry-based COSMOtherm calculations were performed to estimate the psat values of the studied compounds. COSMOtherm predicted the psat value for most of the studied compounds within one order of magnitude difference between the experimental and computational estimates.

Zijun Li et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2023-43', Anonymous Referee #1, 20 Feb 2023
  • RC2: 'Comment on acp-2023-43', Anonymous Referee #2, 24 Feb 2023

Zijun Li et al.

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Short summary
Saturation vapor pressures (psat) of low-volatility organic compounds (LVOCs) govern their partitioning between gas and particle phases. To estimate the psat of selected LVOCs, we performed particle evaporation measurements in a residence time chamber at a temperature setting relevant to atmospheric aerosol formation and also conducted state-of-the-art computational calculations. We found a good agreement between the experimentally measured and model-estimated psat values for most of the LVOCs.
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