GB/T 12690.21-2024 Active National standards

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

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

Publish Date: 2024-10-26 Implement Date: 2025-05-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 12690.21-2024

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Analysis methods for rare metals and their alloys

ICS Name: Other non-ferrous metals and their alloys

Publish Date: 2024-10-26

Implement Date: 2025-05-01

Pages: 12 pages

Scope

This document describes the method for determining the sulfate content in rare earth oxides.
This document is applicable to the determination of the sulfate content in rare earth oxides. The measurement range (mass fraction): 0.010% to 0.20%.

Development Information

Word Count: 17 Thousand words Pages: 12 pages

Same series standard

GB/T 12690.12-2024 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 12:Determination of thorium and uranium contents—Inductively coupled plasma mass spectrum method GB/T 12690.20-2024 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 20:Determination of minor amounts of fluorine and chlorine in rare earth oxides—Ion chromatography method

Referenced Standards

GB/T 6379.2-2004 Accuracy(trueness and precision)of measurement methods and results—Part 2:Basic method for the determination of repeatability and reproducibility of a standard measurement method GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values JJG 178-2007 Ultraviolet,Visible,Near-Infrared Spectrophotometers

Related Standards

GB/T 13840-1992 Abolished

GB/T 13840-1992 Wafer carriers

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GB/T 15677-1995 Replaced

GB/T 15677-1995 Lanthanum metal

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GB/T 3136-1995 abolished_transferred

GB/T 3136-1995 Tantalum powders

Publish Date: 1995-10-17

GB/T 3463-1995 Abolished

GB/T 3463-1995 Tantalum wires

Publish Date: 1995-10-17

GB/T 3628-1995 Replaced

GB/T 3628-1995 Tantalum and tantalum alloy foils

Publish Date: 1995-10-17

GB/T 16476-1996 Replaced

GB/T 16476-1996 Scandium metal

Publish Date: 1996-07-09