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Abstract
A new method for the determination of l-phenyl-3-pyrazolidone (Phenidone) in Phenidone-hydroquinone developers is based on the extraction of the Phenidone with chloroform, titration with a solution of iodine in chloroform in the presence of aqueous acid and back-titration with sodium thiosulphate. The iodine-Phenidone reaction is nearly stoichiometric under these conditions, provided that at least a 50 per cent excess of iodine is used. The titration in the chloroform-water mixture appears to inhibit secondary reactions between iodine and the oxidation products of the Phenidone.
Notes
† Communication No. 2015-H from the Kodak Research Laboratories.