Abstract
The separation selectivity of a group of twenty polycyclic aromatic hydrocarbons (PAHs) (including sixteen Environmental Protection Agency priority PAHs) was studied when mixtures of native β- and γ-cyclodextrins (CDs) are used as modifiers in the separation buffer in cyclodextrin-modified micellar electrokinetic chromatography. The ratio between the concentrations of β- and γ-CDs in the separation buffer as well as the total concentration was varied for various buffer concentrations. An enhancement in selectivity was obtained which enabled the separation of eighteen PAHs when using a 0.140-M borate buffer (pH 9) containing 0.100 M sodium dodecyl sulphate micelles, 0.042 M β-CD, 0.020 M γ-CD and 2.5 M urea. The correlation between the logarithm of the capacity factors of PAHs and the logarithm of their octanol–water distribution coefficients was also investigated.
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