GB/T 12690.17-2010
稀土金属及其氧化物中非稀土杂质化学分析方法.第17部分:稀土金属中铌、钽量的测定
Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides.Part 17: Determination of niobium and tantalum contents of rare earth metals
GBT12690.17-2010, GB12690.17-2010