GB/T 12690.3-2015
稀土金属及其氧化物中非稀土杂质化学分析方法 第3部分:稀土氧化物中水分量的测定 重量法
Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides.Part 3:Determination of water content of rare earth oxides.Gravimetric method
GBT12690.3-2015, GB12690.3-2015