Abstract
he solubilization equilibria of 2-(2-thiazolylazo)-4-methylphenol (TAC) and 2-(2-thiazolylazo)-5-dimethylaminophenol (TAM) in aqueous micellar solutions of nonionic surfactants were investigated according to a distribution model between the micellar and aqueous phases. The distribution constants of TAC and TAM, thus obtained, decreased with an increase in the oxyethylene chain length of nonionic surfactants, indicating the possibility of controlling the distribution of TAC and TAM into micelles. Based on this finding, we tested the micellar reversed-phase high-performance liquid chromatography (micellar RP-HPLC) of vanadium(V)-TAM chelate, which was hardly separated from free TAM in conventional RP-HPLC. Micellar RP-HPLC was effective in preferentially eluting the vanadium(V) chelate in advance of free TAM when a nonionic surfactant with a longer oxyethylene chain was employed.
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