Codes et normes - Achat
ISO 23597:2023
Rare earth — Determination of rare earth content in individual rare earth metals and their oxides — Titration method
SKU: iso_076375_185503
Publié par ISO
Année de publication 2023
1 Edition
10 pages
détails du produit
This document specifies a titration method for the determination of rare earth content in 15 kinds of individual rare earth metals (lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium) and their oxides.
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.
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.
