Abstract
2- and 3-Mercaptopropionic acids, thiomalic acid, 2-mercaptoethanol and propyl mercaptan have been determined by direct titration with potassium persulphate in the presence of iodide in acidic aqueous medium. These mercaptans react with the oxidant in 2 ∶ 1 molar ratio forming corresponding disulphides. The reaction of thio-p-cresol, thioglycollic acid and thioacetic acid with persulphate is too slow to be followed titrimetrically. However, they are oxidised to disulphide when allowed to stand with excess persulphate for 2.0, 1.75 and 0.75 hours respectively. The reaction stoichiometry is not a function of time. 2- and 3-Mercaptopropionic acids, cysteamine hydrochloride, thiomalic acid, thioacetic acid and thioglycollic acid react with potassium persulphate in acidic medium in the presence of iodine cyanide which acts as preoxidiser and catalyst, in the molar ratio 1 ∶ 3 forming corresponding sulphonic acids. As little as 0.50 mg of the mercaptan can be determined in 50 ml solution with ± 0.25 % error.
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