GB/T 12690.10-2003Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of phosphorus content by molybdenum blue spectrophotometric method (English PDF)
稀土金属及其氧化物中非稀土杂质化学分析方法 磷量的测定 钼蓝分光光度法
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Level / Type
National · Recommended
Issue date
November 18, 2003
Implementation date
June 1, 2004
Scope
GB/T 12690.10-2003 is the English-translated version of 稀土金属及其氧化物中非稀土杂质化学分析方法 磷量的测定 钼蓝分光光度法.
GB/T 12690.10-2003 is the Chinese national standard on chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--determination of phosphorus content by molybdenum blue spectrophotometric method, in the field of metallurgy.
The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up — which in practice is how most foreign buyers meet it.
It was issued on 18 November 2003 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, and has been in force since 1 June 2004.
Classification: ICS 77.120.99, CCS H65. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there.
The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.
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Document preview — GB/T 12690.10-2003
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H65
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Contents
- Foreword
- 1 Scope
- 2 Principle of the method
- 3 Reagents
- 4 Apparatus
- 5 Test specimens
- 6 Analytical procedure
- 7 Calculation of the analytical results
- 8 Precision
- 9 Quality assurance and control
3 Reagents
4 Apparatus
5 Test specimens
6 Analytical procedure
7 Calculation of the analytical results
8 Precision
9 Quality assurance and control
Foreword
This document was issued on 18 November 2003 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, and has been in force since 1 June 2004.
It replaces GB/T 12690.21-1990.
Classification: ICS 77.120.99, CCS H65.
About this edition
GB/T 12690.10-2003 is the current edition. It was issued on 18 November 2003 and has been in force since 1 June 2004, replacing GB/T 12690.21-1990.
GB/T 12690.21-1990 has been superseded: a specification that still cites it is citing a withdrawn edition.
The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one from the record of the Standardization Administration.
Classification and status
GB/T 12690.10-2003 is classified under ICS 77.120.99, in the field of metallurgy. ICS is the International Classification for Standards, the same scheme used by ISO and by the national bodies of most countries, which is what allows a Chinese standard to be placed beside its foreign counterparts on subject rather than on number.
Its Chinese Standard Classification code is CCS H65. CCS is the domestic scheme, a letter for the sector and two digits for the subject within it, and it is the code by which the standard is filed and searched in China.
The GB/T prefix marks a recommended national standard. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it. In practice that covers most of the cases in which it will be read — a purchase specification, an inspection agreement or a certification scheme.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.
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Editions of GB/T 12690.10
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 12690.10-2003 | Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of phosphorus content by molybdenum blue spectrophotometric method | current edition | Current |
| GB/T 12690.21-1990 | Rare-earth metals and their oxides--Determination of phosphorus content--Molybdenum blue spectrophotometric method | merged into this edition | Superseded |
This page sells the current edition, GB/T 12690.10-2003. Earlier editions are listed for reference only.
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GB/T 12690.1-2022 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 1: Determination of carbon and sulfur contents - High frequency-infrared absorption method
GB/T 12690.11-2025 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 11: Determination of magnesium content - Flame atomic absorption spectrometric method
GB/T 12690.12-2024 — Chemical analysis methods for non-rare earth impurities in rare earth metals and their oxides - Part 12: Determination of thorium and uranium - Inductively coupled plasma mass spectrometry
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