An electrochemical reduction device developed according to electrolysis,electrodialysis and electromigration theories can reduce bromate to bromide without any use of reagent. The high concentration chloride in samples would interfered the detection of bromate by Ion Chromatography,but this defect could be overcome if bromate is reduced to bromide before detection. When useing the electrochemical reduction device to detect bromate in real samples,the detection limit of bromate was 0. 32 mg / kg,the within d...