Abstract
A simple analytical method was developed for quantitative determinaion of potassium bromate in bread and fish paste products by anion exchange resin column separation followed by colorimetry.The principles of the proposed method are as follows. Potassium bromate was extracted with water from samples, absorbed on an Amberlite IRA-47 (acetate form) resin column in 50% acetic acid condition and eluted with 0.05N potassium hydroxide -0.5N potassium acetate solution. The eluate was mixed with o-tolidine and hydrochloric acid as coloring reagents, and the absorbance of the solution was determined at 440nm after 20 minutes. The recoveries were 74-83% from bread and 79-88% from fish paste products. The detection limit was 1μg/g.The method was applied to the analysis of bread and fish paste products. In 100 samples (bread 10, fish paste products 90), no potassium bromate was detected.
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