ADSORPTION OF SURFACE‐ACTIVE MATERIAL AT THE SEA—AIR INTERFACE1

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Abstract
Surface tension and surface potential measurements were used to detect the adsorption of surface‐active material at the sea‐air interface. With undisturbed water samples, several hours were often required for a significant decrease in surface tension to be observed. The rate of adsorption increased remarkably when a stream of air bubbles was passed through the water, or when the water was stirred vigorously. In the Bay of Panama, the concentration of readily adsorbed surface‐active material was rather constant with depth from the few centimeters at the surface to at least 20 m. Only the thin layer of water at the interface showed a significantly greater concentration.

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