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The use of the Gibbs equation in determining the adsorption of a surface-active electrolyte is discussed. The effect of excess inorganic salt on the amounts of sodium dodecyl sulphate adsorbed at the interface of a standard decane emulsion has been determined. Interfacial tension measurements on the same systems show that results consistent with the direct adsorption data are obtained, provided that a factor of 2 is included in the approximate form of the Gibbs equation for solutions containing no inorganic salt. Equations of state for the adsorbed films are considered.

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