GB/T 14635-2008: Rare earth metals and their compounds -- Determination of total rare earth contents

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Scope

This Method specifies the determination method for total rare earth contents in
rare earth metals and their compounds.
This Method is applicable to the determination of total rare earth contents in
individual and mixed rare earth metals and their compounds. See Table 1 for
the range of determination.
This Method is not applicable to the determination of total rare earth contents
in individual and mixed rare earth metals and their compounds of which
holmium, erbium, thulium, ytterbium, lutecium compose the main body or the
thorium content, the lead content (mass fraction) is greater than 0.1%,
respectively.
Table 1
Specimen Range of determination (mass fraction)/%
Rare earth metal 95.0 ~ 99.5
Rare earth oxide 95.0 ~ 99.8
Rare earth hydroxide 55.0 ~ 75.0
Rare earth fluoride 65.0 ~ 80.0
Rare earth chloride 40.0 ~ 60.0
Rare earth carbonate 10.0 ~ 60.0
Rare earth nitrate 30.0 ~ 70.0
Ionic rare earth ore mixed rare earth oxide 80.0 ~ 99.0

Basic Data

Standard ID	GB/T 14635-2008 (GB/T14635-2008)
Description (Translated English)	Rare earth metals and their compounds -- Determination of total rare earth contents
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H14
Classification of International Standard	77.120.99
Word Count Estimation	13,127
Date of Issue	2008-06-17
Date of Implementation	2008-12-01
Older Standard (superseded by this standard)	GB/T 12687.1-1990; GB/T 14635.1-1993; GB/T 14635.2-1993; GB/T 14635.3-1993; GB/T 16484.19-1996; GB/T 18882.1-2002; GB/T 8762.1-1988
Regulation (derived from)	National Standard Approval Announcement 2008 No.10 (Total No.123)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the determination of single and mixed rare earth metals and rare earth compounds in total. This method is applicable to both single and mixed rare earth rare earth determination of total and compounds. Measuring range in Table 1. This method does not apply to holmium, bait, thulium, ytterbium, lutetium as the main or thorium, lead content (mass fraction) for the determination of the major single and mixed total rare earth rare earth metals and their compounds in 0. 1%.