GB/T 12690.7-1990Neodymium and neodymium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide, yttrium oxide contents--X-ray fluorescence spectrometric method (English PDF)
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 12690.7-1990 | Neodymium and neodymium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide, yttrium oxide contents--X-ray fluorescence spectrometric method | Obsolete |
GB/T 12690.7-1990 is obsolete. It has been replaced by GB/T 12690.7-2003. This page sells the obsolete edition, for projects and contracts that still cite it.
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Level / Type
National · Recommended
Scope
GB/T 12690.7-1990 (Neodymium and neodymium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide, yttrium oxide contents--X-ray fluorescence spectrometric method) is available as an English-translated PDF.
GB/T 12690.7-1990 is the Chinese national standard "Neodymium and neodymium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide, yttrium oxide contents--X-ray fluorescence spectrometric method". It is obsolete: it has been replaced by GB/T 12690.7-2003.
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Document preview — GB/T 12690.7-1990
Contents
- Document data
1 Document data
Sector: National standard (Recommended).
Status: obsolete, replaced by GB/T 12690.7-2003.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.
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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 12690.6-1990 — Praseodymium oxide--Determination of lanthanum oxide, cerium oxide, neodymium oxide, samarium oxide and yttrium oxide contents--Emission spectrographic 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 12690.7-1990
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