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Under certain conditions, the adsorption of surfactants at the liquid-liquid and at the liquid-air interface is found to be practically independent of the surfactant concentration in a considerable concentration range below but near the critical micellar concentration. The value of the adsorption in this range, to be called saturation adsorption, is used to charactcrize the surface-active behaviour of surfactants. This value is determined by the nature of the hydrophilic group of the surfactant, and by the interaction of this group with other polar compounds present at the interface. The shape and size of the hydrophobic group have only a minor influence on the saturation adsorption.

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