Abstract
The retentions of twelve phenoxyacetic acid derivatives were measured on a porous graphitized carbon (PGC) column using dioxane-water mobile phases without additives and with added sodium acetate, acetic acid and lithium chloride. Good linear correlations were found between the capacity factors and the dioxane concentration in the mobile phase. The number of substituents on the benzene ring and their hydrophilicity most strongly affected the retention behaviour of phenoxyacetic acid derivatives with dioxane-water eluents. Sodium acetate had the greatest effect on both retention and selectivity, emphasizing the considerable role of the degree of dissociation of solutes on their retention on a PGC column.
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