GB/T 18882.5-2026Chemical analysis methods for mixed rare earth oxide of ion-adsorption rare earth ore - Part 5: Determination of sulfate content (English PDF)
离子型稀土矿混合稀土氧化物化学分析方法 第5部分：硫酸根含量的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
July 30, 2026
Implementation date
February 1, 2027
Scope
GB/T 18882.5-2026 is the English-translated version of 离子型稀土矿混合稀土氧化物化学分析方法 第5部分：硫酸根含量的测定.
GB/T 18882.5-2026 is the Chinese standard "Chemical analysis methods for mixed rare earth oxide of ion-adsorption rare earth ore - Part 5: Determination of sulfate content".
Its scope clause reads: This document describes a method for determining the sulfate content in mixed rare earth oxides of ionic rare earth ores. This document applies to the determination of sulfate content in mixed rare earth oxides of ionic rare earth ores, including. turbidimetric method (Method 1) and gravimetric method.
(Method 2). Turbidimetric method (Method 1) determination range (mass fraction). 0.20%~2.00%; Gravimetric method (Method 2) determination range (mass fraction) When the measurement ranges of the two methods in this document overlap, Method 1 shall be used as the arbitration method. Its clauses include terms and definitions; turbidimetric method (method 1).
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Document preview — GB/T 18882.5-2026
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 14
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Edition and transition
- 3 Classification and status
- 4 Structure of the document
- 5 The English edition
1 Scope
This document describes a method for determining the sulfate content in mixed rare earth oxides of ionic rare earth ores.
This document applies to the determination of sulfate content in mixed rare earth oxides of ionic rare earth ores, including. turbidimetric method (Method 1) and gravimetric method.
(Method 2). Turbidimetric method (Method 1) determination range (mass fraction). 0.20%~2.00%; Gravimetric method (Method 2) determination range (mass fraction)
When the measurement ranges of the two methods in this document overlap, Method 1 shall be used as the arbitration method.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 6379.2 Accuracy (correctness and precision) of measurement methods and results - Part 2.Determining the repeatability of standard measurement methods
Basic methods of sex and representation
GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories
GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values
JJG178 Verification Procedure for Ultraviolet, Visible and Near-Infrared Spectrophotometers
3 Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4 Turbidimetric method (Method 1)
4.1 Principle
The sample was dissolved in acid, and in the presence of glycerol stabilizer in dilute hydrochloric acid, barium chloride was added to form a barium sulfate suspension.
The absorbance was measured at 400 nm using a spectrophotometer, and the value was obtained from the standard curve to calculate the sulfate content.
4.2 Reagents and Materials
Unless otherwise specified, only reagents confirmed to be of analytical grade or higher and reagents conforming to the secondary standard specified in GB/T 6682-2008 shall be used in the analysis.
Water. Certified standard solutions should be used preferentially.
4.2.2
Hydrofluoric acid (rho=1.13g/mL).
4.2.3
Perchloric acid (rho=1.67g/mL).
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 18882.1-2023 — Chemical analysis methods of mixed rare earth oxide of ion-absorption rare earth ore—Part 1:Determination of fifteen rare earth oxides composition
GB/T 18882.2-2017 — Chemical analysis methods for mixed rare earth oxide of ion-adsorption type rare earth ore - Part 2: Determination of the aluminium oxide content
GB/T 18882.3-2019 — Chemical analysis methods for mixed rare earth oxide of ion-absorption rare earth ore - Part 3: Determination of silicon dioxide content
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