GB/T 12690.21-2024: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 21: Determination of sulfate radical content in rare earth oxides - Barium sulfate turbidimetry

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Scope

This Document specifies a method for the determination of sulfate radical content in rare earth
oxides.
This Document is applicable to the determination of sulfate radical content in rare earth oxides.
The determination range (mass fraction) is 0.010% ~ 0.20%.

Basic Data

Standard ID	GB/T 12690.21-2024 (GB/T12690.21-2024)
Description (Translated English)	Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 21: Determination of sulfate radical content in rare earth oxides - Barium sulfate turbidimetry
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H14
Classification of International Standard	77.120.99
Word Count Estimation	11,182
Date of Issue	2024-10-26
Date of Implementation	2025-05-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration