Direct Colorimetric Determination of Small Quantities of m-Aminophenol in Sodium Aminosalicylate

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Abstract
A colorimetric method has been developed for the determination of m-aminophenol in sodium p-aminosalicylate by formation of a blue colour with phosphomolybdic acid. Although both sodium aminosalicylate and m-aminophenol form blue complexes with this reagent, prior isolation of the m-aminophenol is unnecessary because the extinction coefficient for the m-aminophenol complex is 90 times that of sodium p-aminosalicylate complex.

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