Research on determination of bromate in flour and flour products by Ion chro-matography

Objective To establish a method for determination of bromate in flour and its products by ion chromatography.Methods Bromate was first extracted from the sample by oscillation with pure water,then the supernatant liquid was centrifuged,and the RP,Ag / H column was employed to remove protein and chloride,then the solution was filtrated through 0.22 μm filter membrane to ultrafiltration,finally the suppressed conductivity detector was used for detection after separation with DIONEX IonPac AS19 and elution with sodium hydroxide solution.Results The linear range was 1.0 μg.mL-1 ～ 6.0 μg.mL-1 for bromate with correlation coefficients of more than 0.9998,the detection limit was e 0.50 mg.kg-1,the recoveries were 85% ～99%.Conclusion The developed method is satisfied with the determination for bromate in flour and its products.