Abstract
Summary New indirect colorimetric methods for the determination of thioglycolic, thiolactic and thiomalic acids are described. The mercapto compound to be determinated is oxidised by a known excess of K2CrO4, this excess determinated by measuring the extinction at 470 mμ of the red colour developed when the CrO4−2 reacts with o-dianisidine in acid medium. The method permits a very simple colorimetric determination of the mercapto compounds above mentioned, at a very low concentration (0.1–5 μg/ml).
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