GB/T 4325.21-2013Methods for chemical analysis of molybdenum - Part 21: Determination of carbon content and sulfur content - High frequency combustion-infrared absorption method (English PDF)
钼化学分析方法 第21部分：碳量和硫量的测定 高频燃烧红外吸收法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 9, 2013
Implementation date
February 1, 2014
Scope
GB/T 4325.21-2013 is the English-translated version of 钼化学分析方法 第21部分：碳量和硫量的测定 高频燃烧红外吸收法.
GB/T 4325.21-2013 is the Chinese standard "Methods for chemical analysis of molybdenum - Part 21: Determination of carbon content and sulfur content - High frequency combustion-infrared absorption method".
Its scope clause reads: GB/T 4325 This section provides for the determination of molybdenum in the amount of carbon and sulfur content. This section applies to molybdenum powder, molybdenum, molybdenum trioxide and ammonium molybdate measured the amount of carbon, sulfur content.
Measurement range. Carbon. 0.0005% 0.30%; S. 0.0005% to 0.30%. Its clauses include method summary; reagents and materials; instruments and equipment; sample.
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Document preview — GB/T 4325.21-2013
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 63
- Replacing
- GB/T 4325.27-1984
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Method summary
- 3 Reagents and materials
- 4 instruments and equipment
- 5 Sample
1 Scope
GB/T 4325 This section provides for the determination of molybdenum in the amount of carbon and sulfur content.
This section applies to molybdenum powder, molybdenum, molybdenum trioxide and ammonium molybdate measured the amount of carbon, sulfur content. Measurement range. Carbon. 0.0005%
0.30%; S. 0.0005% to 0.30%.
2 Method summary
Sample high frequency induction furnace combustion oxygen gas stream is heated to produce carbon dioxide and sulfur dioxide, the carrier of oxygen to the infrared analyzer
Testing room, absorbing carbon dioxide and sulfur dioxide, respectively, of a particular wavelength of infrared energy absorbed is proportional to the concentration of energy and carbon and sulfur, according to inspection
Detector receiving energy changes measured the amount of carbon and sulfur content.
3 Reagents and materials
3.1 iron flux
wFe>=99.8%, wC<=0.0005%, wS<=0.0005%, particle size <=1.25mm.
3.2 tungsten tin flux
wC<=0.0010%, wS<=0.0003%, granularity <=1.4mm.
3.3 carbon, sulfur standard substance (or standard sample)
to be tested like carbon and sulfur content similar congeners.
3.4 Oxygen
volume fraction of not less than 99.95%.
3.5 magnesium perchlorate
dry, granular or flaky.
3.6 caustic soda asbestos
granular.
3.7
quartz wool.
3.8
sulfur trioxide absorber.
3.9 platinized silica gel
a granular form.
3.10
crucible tongs.
Before and after use should be higher than 1100 °C high temperature in a high temperature furnace burning 8h or burning to a blank value in oxygen minimum cooling. 3.11 ceramic crucible
Stored in a desiccator.
4 instruments and equipment
4.1 infrared detection system
includes a high frequency induction furnace, the intake pipe purifying reagent to detect gas heater catalyst, sulfur trioxide absorption tube, infrared
Line detectors, computers and software control systems.
4.2
oxygen cylinders and regulators.
4.3 Balance
dividing the value of 0.1mg.
5 Sample
Molybdenum samples sintered product is machined into crumb-like, skin should be removed during processing and prevent pollution. Washed with acetone, if necessary.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of GB/T 4325.21
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4325.21-2013 | Methods for chemical analysis of molybdenum - Part 21: Determination of carbon content and sulfur content - High frequency combustion-infrared absorption method | current edition | Current |
| GB/T 4325.27-1984 | Methods for chemical analysis of molybdenum - Part 21: Determination of carbon content and sulfur content - High frequency combustion-infrared absorption method | previous edition | Superseded |
This page sells the current edition, GB/T 4325.21-2013. Earlier editions are listed for reference only.
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Related Standards
GB/T 4325.22-2013 — Methods for chemical analysis of molybdenum - Part 22: Determination of phosphorus content - Molybdenum blue spectrophotometry
GB/T 4325.20-1984 — Methods for chemical analysis of molybdenum--The N-benzoyl-N-phenylhydroxylamine photometric method for the determination of vanadium content
GB/T 4325.22-1984 — Methods for chemical analysis of molybdenum--The formaldoxime photometric method for the determination of manganese content
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