Titrimetric determination of mercaptans with chloramine-T

Paul, Ram Chand ; Sharma, Satish Kumar ; Kumar, Naresh ; Parkash, Ram (1975) Titrimetric determination of mercaptans with chloramine-T Talanta, 22 (3). pp. 311-312. ISSN 0039-9140

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0039-9140(75)80069-5


Propyl mercaptan, allyl mercaptan, 2-mercaptoethanol, cysteamine hydrochloride, thio-p-cresol, 2-aminobenzenethiol, 2-mercaptopropionic acid and thioglycollic acid react with chloramine-T in 2:1 molar ratio in the presence of iodide, forming the corresponding disulphides. Mercaptans having a free β-carbonyl group do not react quantitatively. The oxidation of the mercaptans is a function of time, and the corresponding sulphonic acids are formed on allowing them to stand with excess of chloramine-T. The oxidation to sulphonic acid is, however, instantaneous in the presence of iodine cyanide which acts as a catalyst and preoxidizer. This method is simple, accurate and rapid, and as little as 0.5 mg of the mercaptan can be determined with ±0.25% error.

Item Type:Article
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ID Code:77045
Deposited On:09 Jan 2012 14:26
Last Modified:09 Jan 2012 14:26

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