Abstract
The separation and retention behaviour of dialkyl sulphides in ligand-exchange gas chromatography have been studied using a copper(II) stearate stationary phase and an ammonia-containing mobile phase. Short retention times and sharp peaks were obtained when ammonia was introduced into the mobile phase. On a solid copper(II) stearate column a linear relationship was found between the capacity factors and the reciprocal of the ammonia concentration, and some equilibrium constants have been calculated. At higher temperatures, copper(II) stearate behaved as a liquid crystalline stationary phase. A good separation of sulphides was achieved by appropriate adjustment of the ammonia concentration and the column temperature. Factors affecting the retention and sample selectivity are discussed.
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