Adsorption of atmospheric gases at the air-water interface. 2. C-1-C-4 alcohols, acids, and acetone

Measurements of the temperature- and concentration-dependent surface tensio ns of aqueous solutions of methanol, 1- and 2-propanol, 1- and 2-butanol, a cetic, propionic, and butanoic acids, and acetone were used to determine th e standard free energies, enthalpies, and entropies of adsorption from the vapor phase onto a water surface. The saturated surface coverage of all the se species is approximately 10(14) molecules cm(-2). The standard enthalpie s of adsorption are correlated to the enthalpies of solution, suggesting th at these molecules are partially solvated in the adsorbed state. These resu lts further suggest that atmospheric water droplets could be coated with an organic layer.