Preprints
https://doi.org/10.5194/egusphere-2023-1123
https://doi.org/10.5194/egusphere-2023-1123
07 Jun 2023
 | 07 Jun 2023

The effect of atmospherically relevant aminium salts on water uptake

Noora Hyttinen

Abstract. Atmospheric new particle formation is initiated by clustering of gaseous precursors, such as small acids and bases. The hygroscopic properties of those precursors therefore affect the hygroscopic properties of aerosol particles. In this work, the water uptake of different salts consisting of atmospheric small acids and amines was studied computationally using the conductor-like screening model for real solvents (COSMO-RS). This method allows for the prediction of water activities in atmospherically relevant salts that have not been included in other thermodynamics models. Water activities are reported here for binary aqueous salt solutions, as well as ternary solutions containing proxies for organic aerosol constituents. The order of the studied cation species regarding water activities is similar in sulfate, iodate and methylsulfonate, as well as in bisulfate and nitrate. Predicted water uptake strengths (in mole fraction) follow the orders: tertiary > secondary > primary amines, and guanidinos > amino acids. The addition of water soluble organic to the studied salts generally leads to weaker water uptake compared to pure salts. On the other hand, water-insoluble organic likely phase separates with aqueous salt solutions, leading to minimal effects on water uptake.

Journal article(s) based on this preprint

06 Nov 2023
The effect of atmospherically relevant aminium salts on water uptake
Noora Hyttinen
Atmos. Chem. Phys., 23, 13809–13817, https://doi.org/10.5194/acp-23-13809-2023,https://doi.org/10.5194/acp-23-13809-2023, 2023
Short summary

Noora Hyttinen

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1123', Anonymous Referee #1, 11 Jul 2023
  • RC2: 'Comment on egusphere-2023-1123', Anonymous Referee #2, 20 Sep 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1123', Anonymous Referee #1, 11 Jul 2023
  • RC2: 'Comment on egusphere-2023-1123', Anonymous Referee #2, 20 Sep 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Noora Hyttinen on behalf of the Authors (25 Sep 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to minor revisions (review by editor) (26 Sep 2023) by Thomas Berkemeier
AR by Noora Hyttinen on behalf of the Authors (27 Sep 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (03 Oct 2023) by Thomas Berkemeier
AR by Noora Hyttinen on behalf of the Authors (03 Oct 2023)  Manuscript 

Journal article(s) based on this preprint

06 Nov 2023
The effect of atmospherically relevant aminium salts on water uptake
Noora Hyttinen
Atmos. Chem. Phys., 23, 13809–13817, https://doi.org/10.5194/acp-23-13809-2023,https://doi.org/10.5194/acp-23-13809-2023, 2023
Short summary

Noora Hyttinen

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Short summary
Water activity in aerosol particles describes the particles respond to variations in relative humidity. Here, water activities were calculated for a set of 80 salts that may be present in aerosol particles, using a state-of-the-art quantum chemistry based method. The effect of the dissociated salt on water activity varies with both the cation and anion. Most of the studied salts increase water uptake compared to pure water soluble organic particles.