Abstract
The surface excesses of tritiated sodium dodecylsulfate (SDS), monooctyltetraethyleneglycol (C 8E 4), and their mixtures were measured directly at the gas-liquid interface. The results show that surface tension changes can be calculated accurately for single surfactants using the Gibbs adsorption equation. For mixed surfactants, especially above the critical micelle concentration, a surface model proposed to date failed to predict surface excess mole fractions from surface tension and bulk concentration changes. An empirical relationship has been derived which links bulk mole fractions and concentrations with the surface excess of individual surfactants in a mixture.
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