稀土金属及其氧化物中稀土杂质化学分析方法 镧中铈、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱、镥和钇量的测定

Chemical analysis methods of rare earth impurities in rare earth metals and their oxides Lanthanum-Determination of cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium contents