Ideally a solvent used to extract a species from an aqueous phase should be colorless, more dense than water, nontoxic, immiscible, and have little tendency to form emulsions. During an investigation aimed at increasing the sensitivity of the iron-phenanthroline method for the determination of sulfur dioxide (7), it was observed that propylene carbonate (4methyl-l,3-dioxolane-2-one) extracted the orange tris(l,10phenanthroline)iron(II) complex rapidly, completely, and neatly. A study was initiated to evaluate propylene carbonate as an extractant.Propylene carbonate has recently been proposed as a solvent for electrochemistry and electron paramagnetic resonance

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