Abstract
Separatory determination of diphenyldisulfide and thianthrene has been investigated. Diphenyldisulfide and thianthrene both develops pink coloration in conc. sulfuric acid and the absorbance at λmax 546mμ is directly proportional to their concentrations.
On the other hand, when a benzene solution containing diphenyldisulfide and thianthrene is treated with conc. sulfuric acid, thianthrene transfers rapidly into the acid layer but diphenyldisulfide remains unextracted.
These have been applied to their determination, in which the sum of diphenyldisulfide and thianthrene in benzene solution is obtained by measuring the absorbancy at 280mμ in benzene solution and the amount of thianthrene only is obtained by measuring the absorbancy at 546mμ of sulfuric acid solution after the extraction. Diphenyldisulfide is estimated from the difference of these two values. Accurate determinations of diphenyldisulfide as little as 4×10-5M and of thianthrene as little as 6×10-5M were made by the proposed method. Permissible mutual ratio for the determination is from 9:1 to 1:7.
