稀土金属及其氧化物中稀土杂质化学分析方法 第15部分：镥中镧、铈、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱和钇量的测定

Chemical analysis methods of rare earth impurities in rare earth metals and their oxides - Part 15: Lutetium - Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium contents