Direct Gas Chromatographic Determination of the Solubility of Light Gases in Liquids. Henry's Law Constants for Eleven Gases in n-Hexadecane, n-Octacosane, and n-Hexatriacontane

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Abstract
Normal gas/liquid chromatography has been used to determine the Henry's Law constants of eleven light gases in three high molecular weight n-alkane solvents at several temperatures. The measured constants ranged from 10–800 atm. Gas/liquid chromatography cannot usually be used to determine the solubility of gases in this high range. Accurate evaluation of the retention time of a hypothetical unretained solute, or the mathematical dead-time, is absolutely critical for slightly soluble gases. Common procedures for the determination of this dead-time are not sufficiently precise to allow the accurate determination of the corrected retention times of rapidly eluting solutes, such as the light gases. In this study, the mathematical dead-time was determined by two independent methods involving the retention times of a series of n-alkanes and inert gases. A mass specific detection system was used to determine the retention times of all eleven solutes in one experiment. Accurate determination of these retention times allowed exact calculation of the dead time and Henry's Law constants for solutes with specific retention volumes as low as 0.15 ml/g

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