Determination and the Behavior of Trace Amounts of Chloride and Bromide Ions in Environmental Waters, such as Rain and River Waters

Abstract

The simultaneous determination of chloride and bromide ions in environmental water by X-ray fluorescence spectrometry after precipitation as silver halides in the presence of ammonium nitrate was developed. Calibration curves for chloride and bromide ions were linear from 0.2 to 7.5mg/l(10-375μg/50ml) and from 0.0025 to 1.0mg/l(0.125-50μg/50ml), respectively. The relative standard deviations were less than 3% for both ions. To clarify the effect of bromide ion in environmental water on trihalomethane (THM) formation during a water treatment with chlorine, the concentrations of the chloride and bromide ions in rain- and river-water samples were measured by the present method.