Water and Wastewater.com Help Forum - Inquiring effect of pH on water surface tension ?
In case of substances with 'positive' surface activity of solutes (if the tend to adsorb at the water-air interface) the pH will have an effect if it influences the adsorption tendency.
Weak organic acids will be far more surface active at low pH than in the alkaline region, proteins have their highest surface activity at their isoelectric point.
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