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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 12690.4-2003 |
Chemical analysis methods for non-rare earth impurities ofrare earth metals and their oxides--Determination of oxygen and nitrogen content--Impulse-infrared and impulse-thermal conductance absorption method 稀土金属及其氧化物中非稀土杂质化学分析方法 氧、氮量的测定 脉冲-红外吸收法和脉冲-热导法 |
China National Standards ofrare |
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