Abstract
An improved colorimetric procedure for the determination of thiacetazone (tibione) has been developed. It is based on the complete hydrolysis of tibione in a concentrated alkaline medium, after which the hydrolytic product is subjected to diazotisation and coupling with α-naphthylethylenediamine dihydrochloride. The procedure suggested in this paper eliminates some disadvantages of the original method and affords reproducible assay results for tibione in galenical preparations.
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