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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Abstracts-Based on a gas chromatography investigation of volatile compounds in growths and pharmaceu ticals of Milk Thistle (Silybum marianum L.), chances for the assessment of the identity of raw materials and fitodrug were established by the account of a set of retention indexes of these compounds on a standard cap illary column with a polydimethylsiloxane stationary phase.

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