Results of the equilibration, which have been tested for thermodynamic consistency, are output to the screen in normal, verbose, form. The various types of information presented are summarised below.
A relative humidity based on the amount of liquid water present and calculated using the Zdanovskii-Stokes-Robinson relationship may also be given. This is explained further in section 4 of the model description page.
If the system contains one or more hydrophobic organic compounds, a non-aqueous (hydrophobic) liquid phase may exist in addition to an aqueous phase. As noted on the model description page, water is excluded from the hydrophobic phase. The very small quantity that would exist there at equilibrium has little effect on the distribution of the different components between the phases.
The column "Act. Eqn." lists the activity coefficient equation used for each solute. "PSC" stands for the Pitzer-Simonson-Clegg equations which are used for inorganic and organic ions, and "R-K" stands for the Redlich-Kister expansion. Other possible entries are "UNIFAC" and "Raoult's law".
Entries in the "Model" column indicate whether the organic components in the system were treated as individual components when their activity coefficients and contribution to the water activity were calculated, or whether they were grouped together. This is explained in section 4 of the E-AIM model description. The possible values in the "Model" column for uncharged organic solutes are: "Single comp.", "UNIFAC", or "ZSR". An entry of "CSB" for water means that the water activity of a mixture containing both ions and organic solutes has been estimated using the approach of Clegg, Seinfeld, and Brimblecombe. See the model description for details.
The density and volume of the liquid phase are listed beneath the table. The calculation of these properties requires that a molar volume has been specified for each organic compound that is present in the phase.
For the surface tension, which follows, a value is displayed for the aqueous phase of inorganic systems and for those containing organic compounds (including organic ions) even if no surface tension model parameters have been entered for them. In such cases the organic species are assumed to have no influence on the surface tension. This assumption is only likely to be reasonable if their concentrations are low relative to those of other solutes (inorganic ions, and organic compounds for which parameters have been entered). Surface tensions are only calculated for the other (hydrophobic) liquid phase, if it exists, if model parameters are available for all components.