An emission spectroscopic method was developed for the determination of B and Cd at trace levels in magnesium employed in the production of nuclear-grade uranium. Magnesium sample was converted to magnesium oxide and ground with pure conducting graphite powder containing LiF and Ga2O3. Thirty mg of the mixture was excited in a DC arc operated at 12 A. A polychromator having secondary slits for B and Cd at 249·77 nm and 228·80 nm respectively was used for recording the intensities. The method gave a mean relative standard deviation of 5·5% for B and 7·6% for Cd in the concentration range 1–10 ppm.
Volume 43, 2020
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