One objective of this project is to determine the adsorptive losses of EOR chemicals on minerals in a systematic manner and expand adsorption models for incorporation as an adsorption module into chemical flooding simulators. The Woodbury-Noll adsorption model was developed which fits both amount and heat of adsorption simultaneously. Two ternary systems were selected with a view to extending the Woodbury-Noll adsorption model to these systems. In the first of these systems, DTAB/NaBr/H20/silica, competitive effects are not present. In the second system, methanol/toluene/heptane/silica, competitive adsoprtion is present. Flow adsorption calorimetry was carried out on these ternary systems and on their respective binaries. Adsorption calorimetry of DTAB from solutions with added electrolyte showed that the heat and the amount of adsorption increased when the salt content was raised to 3 percent, being approximately constant thereafter. However, the increase in salinity above this amount moved the plateau region to lower surfactant concentrations. Adsorption of DTAB at 45)degree)C resulted in lower adsorption than at 25)degree)C, but the heat release was only slightly lower. The heat and amount of adsorption of methanol from heptane onto silica are both markedly reduced by the presence of toluene in the solution. Densities of the surfactant solutions and of the binaries of methanol/toluene/heptane system are reported. 6 refs., 20 figs., 13 tabs.