抄録
A sensitive method for determining nine haloacetic derivatives and four oxo-halogenated compounds (oxo halides) i.e., bromate, chlorite, chlorate and perchlorate, and bromide was developed using ion chromatography with tandem mass spectrometry (IC/MS/MS). This method was found very sensitive and effective to quantify these target compounds, especially oxo halides. For analysis of haloacetic acids, it was necessary to use ammonium chloride for a quenching agent and a Ba/Ag/H cartridge for a sample pretreatment. With this method, the concentrations of perchlorate in raw and purified waters at twelve water treatment plants were examined. The maximum concentration of perchlorate in raw waters and purified waters were 17 μg/l and 18 μg/l, respectively in the Tone river system in the Tokyo Metropolitan area, while their concentrations were less than 1 μg/l in the other river systems. The concentrations of perchlorate in source water and its purified water were almost equivalent for each treatment plant in this research.
