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Updated: Mar 10, 2026

Extraction and Characterization of Surfactants from Atmospheric Aerosols
Published on: April 21, 2017
Deliquescence Relative Humidities of Organic and Inorganic Salts Important in the Atmosphere
Jason R Schroeder1, Keith D Beyer1
1Department of Chemistry and Biochemistry, University of Wisconsin-La Crosse , La Crosse, Wisconsin 54601, United States.
Abstract:
The deliquescence relative humidities (DRH) as a function of temperature have been determined for several salts of atmospheric importance using humidity controlled thermogravimetric analysis (HTGA): sodium hydrogen oxalate monohydrate (NaHC2O4·H2O), sodium oxalate (Na2C2O4), sodium ammonium sulfate dihydrate (NaNH4SO4·2H2O, lecontite), sodium hydrogen malonate monohydrate (NaHC3H2O4·H2O), sodium malonate monohydrate (Na2C3H2O4·H2O), and ammonium hydrogen malonate (NH4HC3H2O4). The temperature-dependent onset DRH values (where a dry mixture begins to take up water) were also determined for mixtures of ammonium sulfate with malonic acid, and ammonium sulfate with sodium oxalates and sodium malonates, respectively. We demonstrate that the onset DRH is independent of the ratio of solids in the mixture. In general, onset DRH values were always lower than the pure component DRH values.
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