Abstract
A simple method for the determination of barium in natural waters by flameless atomic absorption spectrometry using the carbon rod is proposed. Barium in highly salted waters is previously separated from the interfering ions by ion-exchange chromatography, using Dowex 50 W-X8 resin, and eluted with 0.1M EDTA solution. Mineral waters with low salinity are transferred directly to the furnace and the standard addition method is performed. The detection limit is 90 pg Ba for 10νl injections. The method was applied to samples from the Atlantic Ocean and from Araruama Lake. Barium in commercially available waters was also determined.
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