GB/T 4324.26-2012Methods for chemical analysis of tungsten - Part 26: Determination of nitrogen content - Pulse heating inert gas fusion-thermal conductive method and the Nessler reagent spectrophotometry (English PDF)
钨化学分析方法 第26部分：氮量的测定 脉冲加热惰气熔融-热导法和奈氏试剂分光光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 31, 2012
Implementation date
October 1, 2013
Scope
GB/T 4324.26-2012 is the English-translated version of 钨化学分析方法 第26部分：氮量的测定 脉冲加热惰气熔融-热导法和奈氏试剂分光光度法.
GB/T 4324.26-2012 is the Chinese standard "Methods for chemical analysis of tungsten - Part 26: Determination of nitrogen content - Pulse heating inert gas fusion-thermal conductive method and the Nessler reagent spectrophotometry".
Its scope clause reads: This section GB/T 4324 provisions of the tungsten powder, tungsten determination of nitrogen content. This section applies to the determination of tungsten in the nitrogen determination method for a range of 0.0005% - 0.040%; Method 2 measuring ranges 0.0010% to 0.0050%. Its clauses include general.
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Document preview — GB/T 4324.26-2012
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 63
- Replacing
- GB/T 4324.26-1984
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 General
- 3.1 Method summary
- 3.2 Materials and reagents
- 3.3 Instrument
- 3.4 Sample
1 Scope
This section GB/T 4324 provisions of the tungsten powder, tungsten determination of nitrogen content.
This section applies to the determination of tungsten in the nitrogen determination method for a range of 0.0005% - 0.040%; Method 2 measuring ranges
0.0010% to 0.0050%.
2 General
Unless otherwise indicated, this part of the reagents used are in line with national standards or industry standard analytical reagent, the water are distilled water.
3 a method of pulse heating inert gas fusion - thermal conductivity method
3.1 Method summary
Sample was placed in a high purity graphite crucible, in a helium atmosphere at a low voltage and high current high temperature molten form molecular nitrogen is extracted, and the other
After separating the extract gas, thermal conductivity measurement.
3.2 Materials and reagents
3.2.1 Helium
the volume fraction of not less than 99.995%.
3.2.2 High-purity nickel foil or a nickel bag
the nitrogen content is not more than 0.0002%.
3.2.3
High-purity graphite crucible.
3.2.4 copper oxide
granular.
3.2.5 magnesium perchlorate
Anhydrous.
Note. To prevent an explosion, the agent should avoid contact with organic matter, especially should pay particular attention when discarded.
3.2.6
Efficient carbon dioxide absorbent.
3.2.7
glass wool.
3.2.8
Nitrogen certified reference materials.
3.3 Instrument
Pulse heating thermal conductivity azotometer. Instrument sensitivity is not less than 0.01µg/g.
3.4 Sample
3.4.1
powder sample required by 0.180mm sieve, with premeasured nickel foil or a nickel bag tightly wrapped, and then weighing the sample and nickel foil
Of the total, was subtracted mass of the sample.
3.4.2
bulk sample on the silicon carbide grinder gently polishing the surface, and then in a clean mortar carbide hammer on a diameter of about 5mm, […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 4324.26
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4324.26-2012 | Methods for chemical analysis of tungsten - Part 26: Determination of nitrogen content - Pulse heating inert gas fusion-thermal conductive method and the Nessler reagent spectrophotometry | current edition | Current |
| GB/T 4324.26-1984 | Methods for chemical analysis of tungsten - Part 26: Determination of nitrogen content - Pulse heating inert gas fusion-thermal conductive method and the Nessler reagent spectrophotometry | previous edition | Superseded |
This page sells the current edition, GB/T 4324.26-2012. Earlier editions are listed for reference only.
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Related Standards
GB/T 4324.27-2012 — Methods for chemical analysis of tungsten - Part 27:: Determination of carbon content - High frequency combustion-infrared absorption method
GB/T 4324.25-1984 — Methods for chemical analysis of tungsten--The inert gas fusion-coulometric titration method for the determination of oxygen content
GB/T 4324.27-1984 — Methods for chemical analysis of tungsten--The combustion-coulometric titration method for the determination of carbon content
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