Isotope dilution analysis using the redox substoichiometric principle has been applied to the determination of antimony content
in metallic zinc. As the substoichiometric reaction, the oxidation of trivalent to pentavalent antimony with potassium permanganate
was used, followed by separation of these species by the BPHA extraction of trivalent antimony. Determination of antimony
contents less than 0.5 μg was found to be possible with good accuracy, without separation of zinc ions. The antimony content
in metallic zinc was determined to be 19.7±0.8 ppm, in good agreement with the results obtained by the other analytical methods.