GB/T 4324.28-2012Methods for chemical analysis of tungsten - Part 28: Determination of molybdenum content - The thioyanate spectrophotometry (English PDF)
钨化学分析方法 第28部分：钼量的测定 硫氰酸盐分光光度法
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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 4324.28-2012 is the English-translated version of 钨化学分析方法 第28部分：钼量的测定 硫氰酸盐分光光度法.
GB/T 4324.28-2012 is the Chinese standard "Methods for chemical analysis of tungsten - Part 28: Determination of molybdenum content - The thioyanate spectrophotometry".
Its scope clause reads: GB/T 4324 provisions of this part of the tungsten powder, tungsten trioxide, tungsten, tungsten blue, purple tungsten, tungsten acid, ammonium paratungstate determination of molybdenum content.
This Part applies to tungsten powder, tungsten trioxide, tungsten, tungsten blue, purple tungsten, tungsten acid, ammonium paratungstate determination of molybdenum content.
Measurement range Of 0.0015% to 0.35%. Its clauses include method summary; reagents and materials; instrument.
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Document preview — GB/T 4324.28-2012
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 63
- Replacing
- GB/T 4324.28-1984
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Method summary
- 3 Reagents and materials
- 4 Instrument
1 Scope
GB/T 4324 provisions of this part of the tungsten powder, tungsten trioxide, tungsten, tungsten blue, purple tungsten, tungsten acid, ammonium paratungstate determination of molybdenum content.
This Part applies to tungsten powder, tungsten trioxide, tungsten, tungsten blue, purple tungsten, tungsten acid, ammonium paratungstate determination of molybdenum content. Measurement range
Of 0.0015% to 0.35%.
2 Method summary
Sample dissolved hydrogen peroxide or sodium hydroxide, citric acid complex matrix tungsten. In sulfuric acid medium with ferric sulfate as catalyst, with anti
Ascorbic acid reduction of Mo (VI) molybdenum (V), molybdenum with thiocyanate to form a colored complex in a spectrophotometer at 460nm wavelength absorption measured
Luminosity.
3 Reagents and materials
Unless otherwise indicated, used in the analysis confirmed only for the gifted class pure reagents and distilled or deionized water or equivalent purity.
3.3
Hydrogen peroxide (rho = 1.10g/mL).
3.6
Sodium hydroxide solution (200g/L).
3.7
solution of potassium thiocyanate (500g/L).
3.8
ascorbic acid solution (100g/L), the time is now equipped with.
3.9 ferric sulfate solution
Weigh 0.1000g metallic iron, placed in a beaker, add 15mL sulfuric acid (3.5), dissolve completely heated, cooled and transferred to
1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL containing 100µg iron.
3.10 Mo standard stock solution
Weigh 1.8398g ammonium molybdate in a beaker, dissolve a small amount of water, transferred to 1000mL volumetric flask with water
Dilute to volume, and mix. This solution 1mL containing 1000µg molybdenum.
3.11
Molybdenum standard solution A. Pipette 10.00mL molybdenum standard stock solution (3.10) into 100mL volumetric flask, dilute to the mark with water,
Mix well. This solution 1mL containing 50µg molybdenum.
3.12 Molybdenum standard solution B
Pipette 10.00mL molybdenum standard stock solution (3.11) into 100mL volumetric flask, dilute to the mark with water,
Diluted with water to volume, and mix. This solution 1mL containing 5µg molybdenum.
4 Instrument
Spectrophotometer.
......
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
Normative references
GB/T 4324
Similar standards
Editions of GB/T 4324.28
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4324.28-2012 | Methods for chemical analysis of tungsten - Part 28: Determination of molybdenum content - The thioyanate spectrophotometry | current edition | Current |
| GB/T 4324.28-1984 | Methods for chemical analysis of tungsten - Part 28: Determination of molybdenum content - The thioyanate spectrophotometry | previous edition | Superseded |
This page sells the current edition, GB/T 4324.28-2012. Earlier editions are listed for reference only.
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GB/T 4324.1-2012 — Methods for chemical analysis of tungsten - Part 1: Determination of lead content - Flame atomic absorption spectrometry
GB/T 4324.10-2012 — Methods for chemical analysis of tungsten - Part 10: Determination of copper content - Flame atomic absorption spectrometry
GB/T 4324.11-2012 — Methods for chemical analysis of tungsten - Part 11: Determination of aluminum content - Inductively coupled plasma atomic emission spectrometry
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