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Advances in polyhydroxyphenol chemistry are a result of the development of new experimental techniques, especially methods for detection and determination of these compounds. Small-scale procedures are valuable for establishing the concentration and the constitution of polyhydroxyphenols in plant products.Various spectrophotometric and colorimetric rneth~dsl-~ have been reported for the small-scale determination of polyhydroxyphenols. A spectrophotometric method6 has been developed for the determination of catechol, :resorcinol and phloroglucinol with the use of potassium iodate in dilute nitric acid.In this investigation hydroquinone, pyrogallol and resorcinol were determined spectrophotometrically, after heating with sodium carbonate solution in a boiling water-bath for about 15 min. The method is convenient and precise.

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