GB/T 12690.12-1990Neodymium and samarium--Determination of oxygen content--Impulse-infrared absorption method (English PDF)
GB/T 12690.12 | Evolution and historical versions
| Std ID | Title | Status |
|---|---|---|
| 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 | Valid |
| GB/T 12690.12-2003 | Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Determination of thorium content - Arsenazo Ⅲ spectrophotometric method and inductively coupled plasma mass spectrum method | Obsolete |
| GB/T 12690.12-1990 | Neodymium and samarium--Determination of oxygen content--Impulse-infrared absorption method | Obsolete |
GB/T 12690.12-1990 is obsolete. It has been replaced by GB/T 12690.12-2003. 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 12690.12-1990 (Neodymium and samarium--Determination of oxygen content--Impulse-infrared absorption method) is available as an English-translated PDF.
GB/T 12690.12-1990 is the Chinese national standard "Neodymium and samarium--Determination of oxygen content--Impulse-infrared absorption method". It is obsolete: it has been replaced by GB/T 12690.12-2003.
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Document preview — GB/T 12690.12-1990
Contents
- Document data
1 Document data
Sector: National standard (Recommended).
Status: obsolete, replaced by GB/T 12690.12-2003.
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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 12690.13-2026 — Chemical analysis methods for non-rare earth impurities in rare earth metals and their oxides - Part 13: Determination of molybdenum and tungsten content
GB/T 12690.11-1990 — Terbium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide, holmium oxide, erbium oxide and yttrium oxide contents--Emission spectrogra
GB/T 12690.13-2003 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Determination of molybdenum and tungsten content - Inductively couple plasma atomic emission spectrographic method and inductively coupled plasma mass spectr
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GB/T 12690.12-1990
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