GAS-CHROMATOGRAPHIC RETENTION BEHAVIOR OF POLYCHLORINATED NAPHTHALENES ON NONPOLAR, POLARIZABLE, POLAR AND SMECTIC CAPILLARY COLUMNS

Six commercially available gas chromatography columns were investigate d for performance in separating polychlorinated naphthalenes (PCNs). R etention behaviour on the investigated phases is compared and retentio n data for 40 congeners on a 5% phenyl-methylpolysiloxane column is re ported. For all columns, except the octylmethylpolysiloxane and the sm ectic, a relation between substitution pattern and retention was found , where substitution in adjacent positions as well as a-substitution i ncrease the retention time. A mathematical model based on these findin gs was developed and used to predict the relative retention of all con geners from di- up to octachloronaphthalene, on a 5% phenyl-methylpoly siloxane column.