With more widespread ozonation of tap water, increasing attention is being focused on the oxidative halogen acid byproducts, such as bromates. Due to their carcinogenicity, bromates must be measured at µg/L-level sensitivity. Bromate ions are measured in tap water using a cation exchange column and post-column derivatization by the tribromide ion method.
The lower chromatogram in the figure below shows the analysis results for tap water. The upper chromatogram shows the analysis results for tap water spiked to 10 ppb (0.01 mg/L) with bromate ion standard.


Bromate Analysis System


This system conforms to the Japanese Water Quality Inspection Method (Ministry of Health, Labour and Welfare Bulletin No. 261). It measures bromate using ion chromatography-post column absorptiometry. After separating the bromate using anion exchange chromatography, the absorbance is detected using a post-column derivatization method called the tribromide ion method.
As the water quality control standard for bromate is 0.01 mg/L, detection for bromate measurements is required to 10% of this concentration (0.001 mg/L). This system features unique reagent mixing technology to enhance sensitivity and easily achieve the required lower limit of detection.

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