GB/T 12690.4-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides Determination of oxygen and nitrogen content Impulse-infrared and impulse-thermal conductance absorption method (English Version)
This part specifies the method for the determination of oxygen and nitrogen content in rare earth metals. This section applies to the determination of oxygen and nitrogen content in rare earth metals. Measuring range (mass fraction): Oxygen 0.010% ~ 0.30%; Nitrogen 0.0020% ~ 0.20%.
GB/T 12690.4-2003 history
2021GB/T 12690.4-2021 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 4: Determination of oxygen and nitrogen contents—Impulse-infrared absorption and impulse-thermal conductivity method
2003GB/T 12690.4-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides Determination of oxygen and nitrogen content Impulse-infrared and impulse-thermal conductance absorption method
1990GB/T 12690.4-1990 Cerium oxide--Determination of lanthanum oxide, praseodymium oxide, neodymium oxide, samarium oxide and yttrium oxide contents--Spectrochemical method