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interfacial adsorption in their travel down the column. Hydrocarbon retention on water must then be due in part to adsorption at the gas-liquid interface, and consequently, should be dependent on the surface area/liquid volume ratio for the solvent. (The high liquid loading used in this study was chosen to minimize the surface area/liquid volume ratio.)Other nonidealities which may arise in the hydrocarbon elution from water are gas phase imperfections (9) and solute deviations from Raoult's Law (excess partial molar free energy of (9) A.