Study of the adsorption of insoluble and sparingly soluble vapors at the gas-liquid interface of water by gas chromatography

The paper is a continuation of the study of the interfacial properties of water by gas chromatography. Adsorption characteristics at zero surface coverage of a large number of solutes at the gas-liquid interface of water are presented. In all cases of relatively nonpolar solutes, the differential heat of adsorption is found to be less than the heat of liquefaction, indicating the gas liquid interface of water as a low energy surface. For n-propyl ether the heat of adsorption is 4 kcal/mole higher than the heat of liquefaction, strongly suggesting hydrogen bond formation between the ethereal oxygen and the hydrogens from the water surface of the liquid. Also studied was the infinitely dilute solubility characteristics of several non-electrolytes in the thin layers of water coated on wide pore diameter adsorbents. From layer thickness of about 30 A up to 2000 A, the solubility remains constant. Finally some preliminary adsorption and 'sorption' isotherms, determined by gas chromatography, are presented. (Author)