title: Temperature-dependent deliquescence relative humidities and water activities using humidity controlled thermogravimetric analysis with application to malonic acid.
abstract: We utilize a new experimental technique, humidity-controlled thermogravimetric analysis (HTGA), to determine temperature-dependent deliquescence relative humidities (DRH) and to determine the equilibrium concentration of a solution at a given temperature and relative humidity. To that end, we have investigated the malonic acid/water system determining the DRH and concentration/RH relationship in the temperature range 303-278 K. Excellent agreement is found with literature values for the DRH of malonic acid as a function of temperature and for the concentration/RH relationship at several temperatures. Thus, we extend the DRH and concentration/RH relationship to a broader temperature range and are using the HTGA experiments to investigate other organic acids.
authors.affiliation: Department of Chemistry, University of Wisconsin-La Crosse , La Crosse, Wisconsin 54601, United States.
authors.forename: Keith D
authors.initials: KD
authors.lastname: Beyer
authors.forename: Jason R
authors.initials: JR
authors.lastname: Schroeder
authors.forename: Jared A
authors.initials: JA
authors.lastname: Kissinger
mesh_terms: D006813:Humidity; D008314:Malonates / Q000032:analysis*; D013696:Temperature; D013818:Thermogravimetry / Q000295:instrumentation / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D008314:Malonates; D014867:Water; C030290:malonic acid