Separation and Spectrophotometric and Spectrographic Determination of Rare Earths in Uranium Compounds; SEPARAZIONE E DETERMINAZIONE SPETTROFOTOMETRICA E SPETTROGRAFICA DI TERRE RARE IN COMPOSIT DI URANIO

After the extraction of Uranium with 0.5M TIOA in xylene from strong chloride solutions, two methods are proposed to isolate the rare earths elements from other interfering ions: extraction of lantanides by employing TTA in xylene at 60/ deg C; and chromatography on anionic resin sulfuric solutions. The rare earths are determined altogether by a spectrophotometric procedure using arsenazo. In controlled atmosphere it is possible to carry out a qua-ntitative spectrographic determination arcing the fluorides. The procedure for the determination of Gd, Sm, Dy, and Er is described. (auth)