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Phase diagrams and water activities of aqueous dicarboxylic acid systems of atmospheric importance.
MedLine Citation:
PMID:  18959391     Owner:  NLM     Status:  PubMed-not-MEDLINE    
We have studied liquid/solid phase diagrams and water activities of the dicarboxylic acid/water binary systems for maleic, dl-malic, glutaric, and succinc acids using differential scanning calorimetry, infrared (IR) spectroscopy of thin films, and conductivity analysis of saturated solutions. For each binary system we report the measurements of the ice melting envelope, the acid dissolution envelope, and the ice/acid eutectic temperature and composition. Water activities have been determined by using the freezing point depression of ice. Additionally, an irreversible solid/solid phase transition for maleic acid was observed in both DSC and IR studies likely due to the conversion of a meta-stable crystal form of maleic acid to its most stable crystal form. In general we find good agreement with literature values for temperature-dependent acid solubilities.
Keith D Beyer; Katherine Friesen; Jameson R Bothe; Benjamin Palet
Publication Detail:
Type:  Journal Article     Date:  2008-10-29
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  112     ISSN:  1520-5215     ISO Abbreviation:  J Phys Chem A     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-11-14     Completed Date:  2009-02-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  11704-13     Citation Subset:  -    
Department of Chemistry, University of Wisconsin-La Crosse, Wisconsin 54601, USA.
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