Distribution Equilibria of Metal Chelates with Thiazolylazo Dyes between Two Phases Formed from an Aqueous Micellar Solution of a Nonionic Surfactant

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A dilute aqueous micellar solution of poly(oxyethylene)=4-nonylphenyl=ether with oxyethylene units of 7.5 (average, PONPE-7.5) was separated into two phases (aqueous and surfactant) at room temperature. The partition constants of thiazolylazo dyes and their metal chelates between the two phases were determined at 293K and an ionic strength of 0.1(NaClO₄). Though a linear relationship was obtained between the partition constants of the chelating reagents in the extraction with PONPE-7.5 and those in the ordinary extraction with octanol, such a relationship was not obtained for the chelates. This suggested that the properties of the PONPE-7.5 phase as an extracting solvent were different from those of ordinary organic solvents.