Solution Compositions for the UNSATCHEM Module

The set of solution, adsorbed, and precipitated concentration combinations for the UNSATCHEM module is specified in the Solution Compositions dialog window. These (solution, adsorbed, and precipitated) concentration combinations can be used to specify the initial and boundary conditions. The number of solution, adsorbed, and precipitated concentration combinations is specified in the General Solute Transport Information window.

Solution Concentrations need to be specified for all major ions: Ca2+, Mg2+, Na+, K+, Alkalinity, SO42-, Cl-, and an independent tracer; Adsorbed Concentrations for all cations: Ca2+, Mg2+, Na+, and K+; and Precipitated Concentrations for all solids that UNSATCHEM can consider: calcite, dolomite, gypsum, nesquohonite, hydromagnesite, and sepiolite. Solution Concentrations need to be specified in meq/L (L = liter), and Adsorbed Concentrations and Precipitated Concentrations in meq/kg (meq=mmolc).