GB/T 12690.13-2003 稀土金属及其氧化物中非稀土杂质化学分析方法钼、钨量的测定电感耦合等离子体发射光谱法和电感耦合等离子体质谱法

GB/T 12690.13-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Determination of molybdenum and tungsten content—Inductively coupled plasma atomic emission spectrographic method and Inductively coupled plasma mass spectrum method and inductively coupled plasma mass spectrum method