The effects of different parameters on sorbent and solute equilibrium were calculated, based on desorption efficiency and equilibrium constant. The ratio of concentration in the two phases was invariant with changes in the solute to solvent ratio, and desorption efficiency was invariant with loading. Relationships were demonstrated between change in desorption efficiency and in concentration with volume of desorbent at constant weight of sorbent. By increasing the volume of desorbent and the desorption efficiency, the solution concentration was lowered. The author concludes that a linear isotherm can describe the desorption behavior of many compounds, and the isotherm assumes that the heterogeneous equilibrium between the solid and liquid phase controls the concentration at all points. Deviations from predicted behavior may be due to operation in a nonlinear region, inappropriate application of the isotherm to a particular system, or the presence of a chemical reaction.