New Selective Salt-Water Phases in Steam Chromatography

The advantages and limitations of steam chromatography are discussed. The peculiarities of a new steam chromatography version with a polar stationary liquid phase (inorganic salt-water) were investigated. The influence of the salt nature (as a stationary-phase component), temperature of resolution and water-vapor concentration in the mobile phase on the selectivity was studied using a homologous series of n-alcohols C1-C8as a molecular probe. The ascertained regularities as a rule differ from those known for the traditional liquid phase in gas chromatography. The specific efficiency of a packed column with a water-salt phase (NaNO3-water) and polydimethylsiloxane (SE-30) is similar. Examples of methanol determination in petrol and the impurities in a methanol determination are given.