GB/T 4325.24-2013Methods for chemical analysis of molybdenum - Part 24: Determination of tungsten content - Inductively coupled plasma atomic emission spectrometry (English PDF)
钼化学分析方法 第24部分:钨量的测定 电感耦合等离子体原子发射光谱法
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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 4325.24-2013 is the English-translated version of 钼化学分析方法 第24部分:钨量的测定 电感耦合等离子体原子发射光谱法.
GB/T 4325.24-2013 is the Chinese standard "Methods for chemical analysis of molybdenum - Part 24: Determination of tungsten content - Inductively coupled plasma atomic emission spectrometry".
Its scope clause reads: GB/T 4325 provisions of this part of the determination of the amount of tungsten molybdenum. This section applies to molybdenum powder, molybdenum, molybdenum trioxide, ammonium molybdate in the determination of tungsten content.
Measurement range. 0.0050% to 1.50%. Its clauses include method summary; reagents; instrument; sample.
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Document preview — GB/T 4325.24-2013
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 63
- Replacing
- GB/T 4325.28-1984
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Method summary
- 3 Reagents
- 4 Instrument
- 5 Sample
1 Scope
GB/T 4325 provisions of this part of the determination of the amount of tungsten molybdenum.
This section applies to molybdenum powder, molybdenum, molybdenum trioxide, ammonium molybdate in the determination of tungsten content. Measurement range. 0.0050% to 1.50%.
2 Method summary
Sample with nitric acid, hydrofluoric acid and hydrogen peroxide dissolved in Inductively Coupled Plasma Emission Spectrometry Determination of tungsten content.
3 Reagents
Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.
3.1
nitric acid (rho = 1.42g/mL).
3.2
Hydrofluoric acid (rho = 1.17g/mL).
3.3
Hydrogen peroxide (rho = 1.17g/mL).
3.4
molybdate mass fraction >=99.99%, contained tungsten content < 0.0005%.
3.5 W standard stock solution. Accurately weigh 1.260g tungsten trioxide (mass fraction >=99.99%), placed in 250mL beaker, add
20mL of sodium hydroxide solution (200g/L) was dissolved and transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL
Containing 1mg tungsten.
3.6 Tungsten standard solution
Pipette 10.00mL tungsten standard stock solution (3.5), placed in 100mL volumetric flask 6mL nitric acid (3.1), plus
2mL into hydrofluoric acid (3.2) with water to volume, mix, and immediately transferred to dry plastic bottle storage. This solution 1mL containing 100µg tungsten.
Argon 3.7, the volume fraction of not less than 99.99%.
4 Instrument
Inductively coupled plasma emission spectrometer, using nitric acid and hydrofluoric acid dissolution samples need to use hydrofluoric acid resistant sample introduction system. In most instruments
Under good conditions, with 1.0µg/mL standard solution tungsten continuous measurement 11 times, and the relative standard deviation of light intensity does not exceed 2.5%.
5 Sample
Molybdenum should smash through the 0.75mm standard sieve.
Step 6 Analysis
6.1 Sample
Table 1. Weigh the sample to the nearest 0.0001g.
......
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 4325.24
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4325.24-2013 | Methods for chemical analysis of molybdenum - Part 24: Determination of tungsten content - Inductively coupled plasma atomic emission spectrometry | current edition | Current |
| GB/T 4325.28-1984 | Methods for chemical analysis of molybdenum - Part 24: Determination of tungsten content - Inductively coupled plasma atomic emission spectrometry | previous edition | Superseded |
This page sells the current edition, GB/T 4325.24-2013. Earlier editions are listed for reference only.
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Related Standards
GB/T 4325.25-2013 — Methods for chemical analysis of molybdenum - Part 25: Determination of hydrogen content - Intert gas fusion infrared absorption method/thermal conductivity method
GB/T 4325.23-1984 — Methods for chemical analysis of molybdenum--The combustion-conductometric titration method for the determination of sulphur content
GB/T 4325.25-1984 — Methods for chemical analysis of molybdenum--The inert gas fusion-coulometric titration method for the determination of oxygen content
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