This standard specifies the determination method for the content of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide and yttrium oxide in neodymium oxide. This standard applies to the simultaneous determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide and yttrium oxide in neodymium oxide (99.9%-99.99%). The measurement range is shown in Table 1.
GB/T 12690.9-1990 history
2018GB/T 12690.19-2018 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 19: Determination of arsenic and mercury contents
2000GB/T 12690.29-2000 Rare earth metals and their oxide Determination of cerium oxide content-Fluorescent spectrophotometric method
1990GB/T 12690.9-1990 Neodymium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide and yttrium oxide contents--Spectrochemical method