Abstract
A novel and highly sensitive flow-injection chemiluminescence method for the determination of potassium bromate (KBrO3) has been developed. This method is based on the luminescence properties of the KBrO3–Na2SO3–quinine sulfate system in acid medium. Optimized experimental conditions and a possible mechanism were investigated. The relative chemiluminescence intensity responded linearly to the concentration of KBrO3 in the range of 7.054×10−6–1.008×10−4mol/L with a detection limit of 2.116×10−6mol/L. The relative standard deviation (RSD) at 5.0×10−5mol/L KBrO3 (n=12) was 2.3%. The proposed method was applied successfully to the determination of KBrO3 in flour.
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