Dispersive solvents have effect on the dispersion, stability and equilibrium of the ternary-phase system, which should have misci-bility with the extraction solvent and the aqueous sample. Differ-
ent solvents (methanol, ethanol, acetonitrile and acetone) were taken into consideration. Ethanol was selected as dispersive solvent synthesizing each kind of situation for its best performance and the lowest toxicity.