SPECTROGRAPHIC ANALYSIS OF PREPARATIONS OF RARE EARTHS OF THE CERIUM GROUP FOR SAMARIUM

A spectrographic method for determining samarium in compounds of Ce, La, Pr, and Nd is described. The sample, in the form of a 0.05 to 25% solution, was applied to the tip of a graphite electrode which was previously treated with a 3% solution of polystyrene in benzene. The mean relative error for the determination of samarium in cerium was 4.2%, in lanthanum 1.3%, in neodymium 2.5%, and in praseodymium 3.3%. (M.C.G.)