A new method for the standardisation of hypobromite

Summary The oxidation of ferrocyanide by hypobromite and the optical density of the yellow colour of ferricyanide thus developed has been studied with the aid of a Hilger Spekker Absorptiometer Model H 760. A violet filter having maximum transmission in the range of 420–450 m was used. Series of experiments showed that quantitative oxidation of ferrocyanide occurred in the p_N range 8–8.5 (bicarbonate buffer) and the colorimetric titration may be used for the standardisation of hypobromite. The results compared favourably with those obtained by amperometric titration of hypobromite against sodium arsenite as a primary standard.Sincere thanks of the authors are due to Prof. S. S. Joshi, D. Sc. (London), F. R. I. C. (London), F. N. I., F. A. Sc. for kind interest and facilities for the work.