Collect. Czech. Chem. Commun.
1982, 47, 588-593
https://doi.org/10.1135/cccc19820588
Iodometric determination of 2-mercaptobenzthiazole by coulometric titration
Zdeněk Kučera, Milan Karlík and Jiří Krofta
Department of Analytical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6
Abstract
The optimum conditions were found for the determination of 2-mercaptobenzthiazole (MBT) by coulometric titration with the generated iodine using biamperometric indication of the titration end point. Use is made of the oxidation to the disulphide (n = 1) and to benzothiazole-2-sulphinate (n = 4) in the regions pH 4.5-8.5 and 10-12, respectively. Eight repeated titrations to the disulphide gave the relative standard deviations 0.27% and 1.23% in the determination of 1 675 and 33.5 μg MBT, respectively, seven repeated titrations of 419 μg MBT to benzothiazole-2-sulphinate afforded results with the relative standard deviation 0.34%.
