CALCULATION OF SPECIFIC RETENTION VOLUMES IN GAS-CHROMATOGRAPHY FROM RETENTION INDEXES

The Kovats coefficient, K-c,K-Z, of a stationary phase and the solute's molecular structural coefficients, S-c,S-i, depend both on the specific retention volume, V-g, of a solute or homologous series and on the 'log-plot' slope, b, of a chromatographic column. In view of this dependence, the feasibility of predicting v(g)s in the following instances has been investigated: (1) at 120 degrees C, a) V-g prediction of any n-alkane from K-c,K-Z and retention data of n-decane; b) V-g prediction of any term of a homologous series from the correlations of the S-c increments, Delta S-c, with the retention polarity of the given stationary phase of the organic structural function and 2) V-g prediction of any solute from the temperature dependence of K-c,K-Z, b and S-c,S-i. The possibilities of the method are evaluated to the light of the analysis of the deviations of the predicted V-g values from the measured ones.