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See Chinese contents: GB/T 14635-2008 GB/T 14635-2008: Rare earth metals and their compounds -- Determination of total rare earth contents
This Method specifies the determination method for total rare earth contents in rare earth metals and their compounds. This Method is applicable to the determination of total rare earth contents in individual and mixed rare earth metals and their compounds. See Table 1 for the range of determination. This Method is not applicable to the determination of total rare earth contents in individual and mixed rare earth metals and their compounds of which holmium, erbium, thulium, ytterbium, lutecium compose the main body or the thorium content, the lead content (mass fraction) is greater than 0.1%, respectively.
