Mixed stationary phases in gas-liquid chromatography. Partition coefficients and retention indices in OV-101-OV-25, OV-101-carbowax 20M and OV-225-SP-2340 mixtures

Abstract

Partition coefficients of n-alkanes and other substances were measured at 393 K on mixed stationary phase columns prepared by mixing OV-101 with OV-25, OV-101 with Carbowax 20M and OV-225 with SP-2340. The results are examined with respect to the Purnell-Vargas de Andrade and Perry-Tiley relationships. The solvent-solvent interaction parameter was calculated in the three systems. When the value of this parameter is higher than 2 a clear departure from the linear approximation was observed. Retention indices were also calculated and compared with those predicted by the above relationships. © 1987.