Abstract
The combination of solvent extraction and controlled-potential dc polarography directly in the organic extract provides a sensitive and selective method for the determination of uranium. The method should be applicable to a wide range of samples containing trace concentrations of uranium, such as sea water, and waste streams. Uranium concentrations as low as 2.4 μg in 250 ml of sample can be determined when a 5-ml polarographic cell is used. If a smaller polarographic cell is used, as is shown in another paper in this symposium ( 8), an evaporation step can be added after the extraction and as little as 0.2 μg of uranium determined in 250 ml of sample. The method compares favorably in precision with colorimetric methods for uranium and is more selective and free from interferences.
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