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Rare earth — Determination of rare earth content in individual rare earth metals and their compounds — Gravimetric method
The determination ranges for the rare earth content in mass fraction are as follows:
— rare earth metal: 98,0 % (mass fraction) to 99,5 % (mass fraction);
— rare earth oxide: 95,0 % (mass fraction) to 99,8 % (mass fraction);
— rare earth oxalate: 95,0 % (mass fraction) to 99,8 % (mass fraction);
— rare earth fluoride: 75,0 % (mass fraction) to 90,0 % (mass fraction);
— other compounds (i.e. rare earth hydroxide, rare earth chloride and rare earth carbonate): 40,0 % (mass fraction) to 70,0 % (mass fraction).
It does not apply to individual rare earth metals and their compounds when:
a) the matrixes of the sample are erbium, thulium, ytterbium and lutetium;
b) the content of thorium or lead in the sample is greater than 0,1 % in mass fraction.
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