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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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