GB/T 12690.9-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of chlorine content-Silver nitrate turbidimetric method (English Version)
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 12690.9-2003
Replace
GB/T 12690.18-1990GB/T 11074.7-1989
Scope
This part specifies the determination method of chlorine content in rare earth metals and their oxides. This section applies to the determination of chlorine content in rare earth metals and their oxides. Measuring range (mass fraction): 0.005% to 0.20%.
GB/T 12690.9-2003 history
2003GB/T 12690.9-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of chlorine content-Silver nitrate turbidimetric method
1990GB/T 12690.9-1990 Neodymium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide and yttrium oxide contents--Spectrochemical method