Chemical analysis methods of rare earth impurities in rare earth metals and their oxides—Part 1: Determination of cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium contents in lanthanum metal and oxide
Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 12: Determination of thorium and uranium contents—Inductively coupled plasma mass spectrum method