GB/T 18882.1-2023 Methods for chemical analysis of mixed rare earth oxides of ionic rare earth ores - Part 1: Determination of the proportions of fifteen rare earth element oxides (English Version)
2023GB/T 18882.1-2023 Methods for chemical analysis of mixed rare earth oxides of ionic rare earth ores - Part 1: Determination of the proportions of fifteen rare earth element oxides
2020GB/T 14635-2020 Rare earth metals and their compounds—Determination of total rare earth content
2008GB/T 14635-2008 Rare earth metals and their compounds.Determination of total rare earth contents
2002GB/T 18882.1-2002 Chemical analysis methods for mixed rare earth oxide of ion-absorpted type RE ore-Determination of total rare earth contents-Oxalate gravimetric method