Chemical analysis methods of rare earth chloride and light rare earth carbonate - Part 18: Determination of ignition loss content in light rare earth carbonate - Gravimetry
Chemical analysis methods of rare earth chloride and light rare earth carbonate - Part 4: Determination of thorium oxide content - ArsenazoⅢ spectrophotometry
Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of thorium content--Arsenazo III spectrophotometric method and inductively coupled plasma mass spectrum method