Abstract

A spectrographic procedure for the determination of scandium, yttrium, and the rare earths in thorium is described. These elements were separated from thorium dissolved in nitric acid using Dowex 1 anion resin and subsequently analyzed by the <i>Copper Spark Method.</i> Quantitative recoveries of known amounts added to thorium were obtained for Sc, Y, Ce, Sm, Eu, Gd, Dy, Er, and Yb. The values for lanthanum averaged about 90% of the amount added.

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