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Rare earth — Determination of rare earth content in individual rare earth metals and their oxides — Titration 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 99,5 % (mass fraction).
It does not apply to individual rare earth metals and their oxides when:
a) the relative rare earth purity is less than 99,5 % in mass fraction;
b) the total content of various (non-rare earth) metallic elements is greater than 0,5 % in mass fraction;
c) the content of thorium, scandium or zinc is greater than 0,1 % in mass fraction.
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