Patent ID: 8748189

Claim:
A method for measuring bromate ions, comprising: a first step of introducing a test water sample to an anion exchanger that selectively absorbs bromate ions; a second step of introducing, to the anion exchanger, a hydrochloric acid solution containing a fluorescent substance, a fluorescence intensity of which is changed by the coexistence of bromate ions; a third step of measuring the fluorescence intensity of the fluorescent substance contained in the hydrochloric acid solution discharged from the anion exchanger; and a fourth step of using a calibration curve, which shows a relationship between the fluorescence intensity of the fluorescent substance and the concentration of the bromate ions, to calculate a concentration of the bromate ions that corresponds to the measured fluorescence intensity, wherein the third step comprises measuring the fluorescence intensity in one of (a) a case where the excitation wavelength is 264 nm and the emission wavelength is 400 nm, (b) a case where the excitation wavelength is 264 nm and the emission wavelength is 480 nm, and (c) a case where the excitation wavelength is 300 nm and the emission wavelength is 400 nm.