GB/T 12690.8-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of sodium content-Flame atomic absorption spectrometric method (English Version)
This part specifies the method for the determination of sodium content in rare earth metals and their oxides. This section applies to the determination of sodium content in rare earth metals and their oxides. Measuring range (mass fraction): 0.0005% to 0.0250%.
GB/T 12690.8-2003 history
2021GB/T 12690.8-2021 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 8: Determination of sodium content
2003GB/T 12690.8-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of sodium content-Flame atomic absorption spectrometric method
1990GB/T 12690.8-1990 Neodymium and neodymium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide and yttrium oxide contents--Emission spectrographic method