PREDICTION OF PROGRAMMED-TEMPERATURE RETENTION INDEXES ON CAPILLARY COLUMNS OF DIFFERENT POLARITIES

Open tubular capillary columns filled with bonded liquid phases of dif ferent polarities were used for the separation of substituted aromatic compounds (chlorobenzenes and chlorophenols). The retention index val ues obtained during programmed temperature analyses were predicted by starting from retention data obtained under isothermal conditions. The calculation method previously used for the prediction of programmed t emperature retention times was modified and simultaneously applied to the sample mixture and to the reference n-alkanes series. Experimental retention index values measured in different temperature programming conditions were found to agree with the calculated ones.