SummaryA systematic derivation of corresponding equations shows that averaging the pressure and the flow rate of the mobile phase in a gas chromatographic column over the column length and over the time that an unretained component resides in the column, requires the use of 1 2 three different compressibility correction factors, J2, J 3 ' and "3 ]4 9 When multiplied by the adjusted retention volume. VR-VM, the Martin and James mobile phase compressibility correction factor j23 . only, produces the value of specific retention volume, V f, which is connected unambiguously with the thermodynamic phase distribution coefficient, K, of the sorbate.

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Inverse gas-solid chromatography is used to study the adsorption of vapors of organic compounds with different structures and polarities on a carbon adsorbent modified with a monolayer of 4-(3-hydroxypropyloxy)-4'-formylazobenzene (HPOFAB) polar LIQUID crystal. The resulting thermodynamic characteristics of adsorption on the original and modified adsorbents are compared. The effect the nature and structure of adsorbate molecules and the liquid crystal modifier have on the thermodynamic characteristics of adsorption is considered.

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