GB/T 12690.17-2010 Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides.Part 17: Determination of niobium and tantalum contents of rare earth metals (English Version)
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
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GB/T 12690.17-2010
Scope
Method 1 of this part of GB/T 12690 specifies the determination method for the content of niobium and tantalum in single rare earth metals. Method 1 in this part is applicable to the determination of niobium and tantalum content in single rare earth metals. Measuring range: niobium 0.010% ~ 0.50%; tantalum 0.020% ~ 0.50%. Method 2 of this part specifies the determination method for the content of niobium and tantalum in a single rare earth metal. Method 2 of this part is applicable to the determination of niobium and tantalum content in a single rare earth metal. Measuring range: niobium 0.001 0% ~ 0.050%; tantalum in other rare earth metals except holmium 0.001 0% ~ 0.050%; tantalum in holmium 0.002 0% ~ 0.050%.
GB/T 12690.17-2010 history
2011GB/T 12690.17-2010 Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides.Part 17: Determination of niobium and tantalum contents of rare earth metals
1990GB/T 12690.17-1990 Rare-earth metals and their oxides--Determination of calcium content--Nitrous oxide-acetylene flame atomic absorption spectrometric method