Homogeneous liquid-liquid microextraction via flotation assistance method was developedfor extraction of lead in water. A mixture of extraction solvent (1-decanol) and disperser solvent (acetone) containing dithizone as chelating agent is injected into microextraction cell. Then an aqueous sample is injected into microextraction cell until the mixture of solvent forms initial state a homogeneous solution and then forms an emulsion consisting of fine droplets of the extraction solvent, disperser solvent and water. Using air fotation, the extraction solvent is transferred to the surface of the mixture and is collected by means of a micro-syringe. Then 25 mul of the collected organic solvent is diluted with 800 mul decanol and is analyzed with spectrophotometer in 520 nm wavelength. Also, the thermochemistry of complexation reactions was investigated at PM6 and B3LYP/6-31G* computational level.

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