GB/T 18115.15-2010
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, ytterbiu (English Version)