GB/T 12690.7-2003Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Determination of silicon content - 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 硅量的测定 钼蓝分光光度法
GB/T 12690.7 | Evolution and historical versions
| Std ID | Title | Status |
|---|---|---|
| GB/T 12690.7-2021 | Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 7: Determination of silicon content | Valid |
| GB/T 12690.7-2003 | Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Determination of silicon content - Molybdenum blue spectrophotometric method | Obsolete |
GB/T 12690.7-2003 is obsolete. It has been replaced by GB/T 12690.7-2021. This page sells the obsolete edition, for projects and contracts that still cite it.
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China
Level / Type
National · Recommended
Issue date
November 18, 2003
Implementation date
June 1, 2004
Scope
GB/T 12690.7-2003 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 硅量的测定 钼蓝分光光度法.
GB/T 12690.7-2003 is the Chinese national standard "Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Determination of silicon content - Molybdenum blue spectrophotometric method".
It was issued on November 18, 2003 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the Standardization Administration of China, and took effect on June 1, 2004. It is obsolete: it has been replaced by GB/T 12690.7-2021.
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Document preview — GB/T 12690.7-2003
National Standard of the People's Republic of China
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China
Contents
- Document data
1 Document data
Sector: National standard (Recommended).
Issuing body: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China.
Date of issue: 2003-11-18.
Date of implementation: 2004-06-01.
Status: obsolete, replaced by GB/T 12690.7-2021.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 12690.8-2021 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 8: Determination of sodium content
GB/T 12690.6-2003 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Determination of iron content - Kalium thiocyanate, 1, 10-phenanthroline spectrophotometric method
GB/T 12690.8-2003 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Determination of sodium content - Flame atomic absorption spectrometric method
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GB/T 12690.7-2003
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