This standard specifies the determination method for the oxide content of cobalt, iron, manganese, lead, chromium, nickel, copper and zinc in lanthanum oxide, cerium oxide, neodymium oxide and gadolinium oxide. This standard is applicable to the simultaneous determination of the oxide content of cobalt, iron, manganese, lead, chromium, nickel, copper and zinc in lanthanum oxide, cerium oxide, neodymium oxide and gadolinium oxide. The measurement range is shown in Table 1.
GB/T 12690.14-1990 history
2017GB/T 12690.5-2017 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 5: Determination of cobalt,manganese,lead,nickel,copper,zinc,aluminum,chromium,magnesium,cadmium,vanadium and iron contents
2003GB/T 12690.5-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides Determination of Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, Pb content by inductively coupled plasma atomic emission spectrographic method and Determination of Co, Mn, Pb,
1990GB/T 12690.14-1990 Lanthanum oxide, cerium oxide, neodymium oxide, gadolinium oxide--Determination of cobalt, iron,manganese, nichel, copper, ckromium, lead and zinc in oxides contents--Emission spectrographic method
GB/T 12690.14-1990 Lanthanum oxide, cerium oxide, neodymium oxide, gadolinium oxide--Determination of cobalt, iron,manganese, nichel, copper, ckromium, lead and zinc in oxides contents--Emission spectrographic method was changed to GB/T 12690.5-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides Determination of Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, Pb content by inductively coupled plasma atomic emission spectrographic method and Determination of Co, Mn, Pb, .