This standard specifies the determination method of thorium oxide content in rare earth chloride and rare earth carbonate. This standard applies to the determination of thorium oxide content in rare earth chloride and rare earth carbonate. Measuring range: 0.0005% to 0.3%.
GB/T 16484.4-1996 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