Abstract
The retention orders of tetrachlorodibenzo- p-dioxin (TCDD) isomers on a monomeric and a polymeric ODS column were determined by RP-HPLC. It is demonstrated that the drastic alteration of the retention order with variation of the stationary phase can be explained by a variable influence of steric effects on the retention. The length-to-breadth ratios of TCDDs were calculated and correlated with retention data. The polymeric ODS phase proved to be superior to the monomeric phase with respect to selectivity. The enhanced selectivity is attributed to an enhancement of the shape selectivity of the stationary phase. The retention order is also strongly dependent on the mobile phase.
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