Based on the fluorescence quenching effect produced by oxidation of acridine orange with BrO3- in the presence of KBr in a HC1 medium, a method for the determination of trace amount of BrOa in drinking water was proposed. Linear relationship between magnitude of decrease in fluorescence intensity （AF） and mass concentration of BrO3- was kept in the range of 10. 0--560. 0μg · L-1, when measured at （λex） 493 nm and （λem） 528 nm, Value of detection limit （3S/N） found was 3. 03 μg · L-1. The proposed method was applied to the determin...
