DETERMINATION OF SMALL AMOUNTS OF RARE EARTHS IN PRASEODYMIUM, NEODYMIUM, SAMARIUM, TERBIUM, DYSPROSIUM, HOLMIUM, ERBIUM AND THULIUM PREPARATIONS

Analytical lines suitable for determining ten thousandth parts of lanthanum, prasendymium, neodymium, samarium, europium. gadolinium. terbium, yttrium, dysprosium, holmium, erbium, thulium. and ytterbium were chosen on the basis of a study of their spectra in the region 3000 to 4600 A. (auth)