Accession Number : AD0761655

Title :   Study of the Interfacial Properties of Water by Gas Chromatography.

Descriptive Note : Final rept.,

Corporate Author : NORTHEASTERN UNIV BOSTON MASS DEPT OF CHEMISTRY

Personal Author(s) : Karger,Barry L.

Report Date : 01 JUN 1973

Pagination or Media Count : 25

Abstract : A summary of work on the interfacial properties of water by gas chromatography is presented. In this method the retention of nonelectrolytes is measured; for some solutes only adsorption at the gas-liquid interface occurs whereas for others both adsorption and partition simultaneously take place. The results indicate that bulk water is a low energy surface to hydrocarbons. It is also shown for the first time that there is a formation of hydrogen bond interactions between water surface molecules and Bronsted bases. In terms of partition, the results indicate that water coated in thin layers on wide-pore silica is similar to bulk water in its solvent properties. Also presented are results on the interfacial properties of sodium chloride solutions. In general, the adsorption coefficient of nonelectrolytes increases as NaCl concentration increases. However, a definite minimum in adsorption coefficient for many solutes is found at 0.50 molal NaCl. Also measured were salting-out constants. The study has developed gas chromatography to the point that it can be successfully used in the study of electrolyte solutions. (Modified author abstract)

Descriptors :   (*WATER, *GAS CHROMATOGRAPHY), (*MOLECULAR ASSOCIATION, WATER), ADSORPTION, SURFACES, SODIUM CHLORIDE, SOLUTIONS(MIXTURES)

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE