ISO 23597:2023 稀土 单个稀土金属及其氧化物中稀土含量的测定 滴定法

标准编号：ISO 23597:2023

中文名称：稀土 单个稀土金属及其氧化物中稀土含量的测定 滴定法

英文名称：Rare earth — Determination of rare earth content in individual rare earth metals and their oxides — Titration method

发布日期：2023-08

标准范围

本文件规定了测定15？中稀土含量的滴定方法。各种稀土金属（镧、铈、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱、镥和钇）及其氧化物。稀土质量分数的测定范围如下:—？稀土金属:98.0？%（质量分数）至99.5？%(质量分数)；—？稀土氧化物:95.0？%（质量分数）至99.5？%（质量分数）。在下列情况下，它不适用于个别稀土金属及其氧化物:A）？稀土相对纯度小于99.5？质量分数%；b）？各种（非稀土）金属元素总含量大于0,5？质量分数%；c）？钍、钪或锌的含量大于0、1？质量分数%。

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.

标准预览图