CaltechAUTHORS
  A Caltech Library Service

Studies of concentrated electrolyte solutions using the electrodynamic balance. 2. Water activities for mixed-electrolyte solutions

Cohen, Mark D. and Flagan, Richard C. and Seinfeld, John H. (1987) Studies of concentrated electrolyte solutions using the electrodynamic balance. 2. Water activities for mixed-electrolyte solutions. Journal of Physical Chemistry, 91 (17). pp. 4575-4582. ISSN 0022-3654. https://resolver.caltech.edu/CaltechAUTHORS:20150805-103745250

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20150805-103745250

Abstract

An electrodynamic balance has been used to measure the water activity as a function of solute concentration at 20 °C for three aqueous electrolyte mixtures: NaCI-KCI, NaCl-KBr, and NaCl-(NH_4)_2SO_4. The measurements were performed by levitating single, charged particles of these electrolyte mixtures within the balance and measuring the mass of the particles as a function of the surrounding relative humidity. The deliquescence behavior of the mixed-electrolyte particles was also observed. For the alkali halide mixtures, the low-concentration data were consistent with earlier investigations. Data were obtained at higher concentrations than previously reported. The amount of water in the NaC1-(NH_4)_2SO_4 particles after drying was unknown. This, together with the lack of previously reported water activity data for this mixture, complicated the analysis of these experiments. Three models of mixed-electrolyte solutions-the Zdanovskii-Stokes-Robinson, Reilly-Wood-Robinson, and Pitzer methods-agreed well with the experimental data for the NaCl-KCl and NaCl-KBr systems over the range of concentrations that the models could be applied. The mixing rules' predictions were consistent with the experimental observations for the NaCl-(NH_4)_2SO_4 system assuming a small amount of water was retained in the particles after drying.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/j100301a030DOIArticle
http://pubs.acs.org/doi/abs/10.1021/j100301a030PublisherArticle
ORCID:
AuthorORCID
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 1987 American Chemical Society. (Received: December 5, 1986) This work was supported by the U.S. Environmental Protection Agency under Grant No. R-810857.
Funders:
Funding AgencyGrant Number
Environmental Protection Agency (EPA)R-810857
Issue or Number:17
Record Number:CaltechAUTHORS:20150805-103745250
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150805-103745250
Official Citation:Studies of concentrated electrolyte solutions using the electrodynamic balance. 2. Water activities for mixed-electrolyte solutions Mark D. Cohen, Richard C. Flagan, and John H. Seinfeld The Journal of Physical Chemistry 1987 91 (17), 4575-4582 DOI: 10.1021/j100301a030
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59204
Collection:CaltechAUTHORS
Deposited By: Irina Meininger
Deposited On:09 Sep 2015 19:30
Last Modified:03 Oct 2019 08:44

Repository Staff Only: item control page