This part of GB/T 16484 specifies the determination method for the amount of thorium oxide in rare earth chloride and light rare earth carbonate. This section applies to the determination of the amount of thorium oxide in rare earth chloride and light rare earth carbonate. Test range: 0.0001% to 0.30%.
GB/T 16484.4-2009 history
2009GB/T 16484.4-2009 Chemical analysis methods of rare earth chloride and light rare earth carbonate.Part 4:Determination of thorium oxide content.ArsenazoⅢ spectrophotometry
1996GB/T 16484.4-1996 Methods for chemical analysis of rare earth chloride and carbonate--Determination of thorium oxide content