2002 Volume 18 Issue 6 Pages 667-670
A simple, precise, sensitive and accurate method was developed for rapid determination of trace quantities of iodate. The method is based on the accelerating effect of iodate on the reaction of bromate and chloride acid in the presence of hydrazine in acidic media. The decolorization of Methyl Orange with the reaction products was used to monitor the reaction spectrophotometrically at 525 nm. Iodate could be determined in the concentration ranges of 0.03 - 1.2 µg ml-1. The relative standard deviation for ten replicate determinations of 0.3 µg ml-1 of iodate was 1.65%. The proposed method was applied to the determination of iodate in table salts with satisfactory results.