China 'GB/T 12690.4-2003
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
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
Issued Date:2003-11-18
Implemented Date:2004-06-01
Issued by:
The Standardization Administration of the People's Republic of China