Radiometric titration of antimony(III) with potassium bromate in hydrochloric acid media using the standard series method
provided much valuable informations on the titration errors which depended on the concentrations of the acid and antimony(III).
The hydrochloric acid concentrations between 2.5 and 3.0M were found to be optimum for the oxidation of antimony(III) amounts
of 4 μg or less. Under these optimum reaction conditions the redox substoichiometric isotope dilution analysis was applied
to the determination of antimony in metallic zinc and the satisfactory results were obtained, without the separation of matrix
element. Also, the merits of various oxidizing agents hitherto studied for the quantitative oxidation of antimony(III) were
compared and discussed.