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Ammonium bisulfate/water: a pseudobinary system.

Keith D Beyer¹, Jameson Bothe

¹Department of Chemistry, University of Wisconsin-La Crosse, 54601, USA. Beyer.Keit@UWLAX.EDU

The Journal of Physical Chemistry. A

|June 2, 2006

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This study details the ammonium bisulfate/water system, presenting the first invariant point measurements and a complete phase diagram. The system is identified as pseudobinary, not truly binary, with discrepancies noted in model predictions at lower temperatures.

Area of Science:

Physical Chemistry
Chemical Thermodynamics
Atmospheric Chemistry

Background:

Ammonium bisulfate and water are key components in atmospheric aerosols.
Understanding their phase behavior is crucial for atmospheric modeling.
Previous studies lacked a complete phase diagram for this system.

Purpose of the Study:

To investigate the ammonium bisulfate/water system.
To determine the ice/ammonium bisulfate/letovicite invariant point.
To construct a comprehensive phase diagram and compare it with existing models.

Main Methods:

Differential scanning calorimetry (DSC) for thermal analysis.
Infrared spectroscopy of thin films.
Solubility data and phase diagram theory.

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Main Results:

Experimental melting points for ice and letovicite align with prior research.
The ice/ammonium bisulfate/letovicite invariant point was measured for the first time.
A complete phase diagram was constructed, revealing a pseudobinary nature.

Conclusions:

The ammonium bisulfate/water system is best described as pseudobinary, part of a larger ternary system.
The aerosol inorganics model shows good agreement for melting points within a limited range.
Model predictions deviate from experimental results at lower temperatures, indicating limitations.