Abstract
An amplification method for the determination of 0.01–2 mg (9.1 x 10−6-1.8 x 10−3M) of quinone or hydroquinone is described. It is based on the reduction of a strong acid solution of quinone by iodide to liberate an equivalent amount of iodine which is extracted into chloroform and then reduced to iodide. The resulting iodide is oxidized by bromine water to iodate which is determined by the Leipert amplification procedure. Hydroquinone is quantitatively oxidized to quinone by iodine, the excess of which is removed by extraction with chloroform, followed by amplification determination of the resulting iodide. The method is shown to be sufficiently sensitive to determine 10μg of quinone or hydroquinone.
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