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Chemiluminescence determination of potassium bromate in flour based on flow injection analysis

Zhengyu Yan,Zhengwei Zhang,Yan Yu,Zhen Liu,Jianqiu Chen

A novel and highly sensitive flow-injection chemiluminescence method for the determination of potassium bromate (KBrO 3 ) has been developed. This method is based on the luminescence properties of the KBrO 3 –Na 2 SO 3 –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 KBrO 3 in the range of 7.054   ×   10 −6 –1.008   ×   10 −4   mol/L with a detection limit of 2.116   ×   10 −6   mol/L. The relative standard deviation (RSD) at 5.0   ×   10 −5   mol/L KBrO 3 ( n   =   12) was 2.3%. The proposed method was applied successfully to the determination of KBrO 3 in flour.