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Homogeneousliquid¨Cliquidextraction is a simple and powerful preconcentration method that reduces the extraction time, disposal costs, consumption and exposure to the organic solvents. This method extracts the solute in a homogeneous solution into the very small sedimented phase formed from the solution by the phase-separation phenomenon. The ternary component solvent system and the perfluorinated surfactant system are the two usual modes of homogeneousliquid¨Cliquidextraction. In homogeneousliquid¨Cliquidextraction, the initial condition is homogeneous solution, namely, there is no interface between the water phase and the water-miscible organic solvent phase. In other words, the surface area of the interface is infinitely large initially. Accordingly, no vigorous mechanical shaking is necessary. The procedure is simple and requires only the addition of the reagent
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