Abstract
A method was developed for the selective determination of trace concentrations of uranium(VI) by flow-injection analysis (FIA) with fluorimetric detection. Uranium(VI) is selectively separated and/or pre-concentrated from a volume up to 20 ml on an activated silica gel microcolumn (2 × 40 mm) from a medium of 0.03 M EDTA, 0.06 M tartrate, and/or 0.05 M NaF at pH = 9.3. After washing the column the uranium is eluted with a mixture of 1.33 M sulphuric and phosphoric acids and determined with a relative standard deviation not exceeding 6% for concentrations in the range 10–250 μg/l. The detection limit was estimated to be 0.1–0.2 μg of uranium. The method has been verified on artificial water samples with high content of the interfering elements and applied to analysis of waste and natural waters.
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