GB/T 12690.7-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of silicon content-Molybdenum blue spectrophotometric method (English Version)
This part specifies the method for the determination of silica content in rare earth oxides. This part specifies the method for the determination of acid-soluble silicon content in rare earth metals and their oxides. This section applies to the determination of silicon content in rare earth metals and their oxides. Measuring range (mass fraction): 0.0010% to 0.20%.
GB/T 12690.7-2003 history
2021GB/T 12690.7-2021 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 7: Determination of silicon content
2003GB/T 12690.7-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of silicon content-Molybdenum blue spectrophotometric method