GB/T 12690.10-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of phosphorus content by molybdenum blue spectrophotometric method (English Version)
This part specifies the method for the determination of phosphorus content in rare earth metals and their oxides. This section applies to the determination of phosphorus content in rare earth metals and their oxides. Measuring range (mass fraction): 0.0010% to 0.0100%.
GB/T 12690.10-2003 history
2003GB/T 12690.10-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of phosphorus content by molybdenum blue spectrophotometric method
1990GB/T 12690.10-1990 Gadolinium oxide--Determination of samarium oxide, europium oxide, terbium oxide, dysprosium oxide and yttrium oxide contents--Emission spectrographic method