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GB/T 4324.28-2012: Methods for chemical analysis of tungsten -- Part 28: Determination of molybdenum content -- The thiocyanate spectrophotometry
Status: Valid GB/T 4324.28: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4324.28-2012 | English | 189 |
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Methods for chemical analysis of tungsten -- Part 28: Determination of molybdenum content -- The thiocyanate spectrophotometry
| Valid |
GB/T 4324.28-2012
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| GB/T 4324.28-1984 | English | 199 |
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Methods for chemical analysis of tungsten--The thiocyanate photometric method for the determination of molybdenum content
| Obsolete |
GB/T 4324.28-1984
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PDF similar to GB/T 4324.28-2012
Basic data | Standard ID | GB/T 4324.28-2012 (GB/T4324.28-2012) | | Description (Translated English) | Methods for chemical analysis of tungsten -- Part 28: Determination of molybdenum content -- The thiocyanate spectrophotometry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H63 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 8,863 | | Older Standard (superseded by this standard) | GB/T 4324.28-1984 | | Regulation (derived from) | National Standards Bulletin No. 41 of 2012 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the tungsten powder, tungsten, tungsten trioxide, tungsten blue, purple, tungsten, tungsten acid, ammonium paratungstate Determination of molybdenum content. This section applies to tungsten powder, tungsten, tungsten trioxide, tun | GB/T 4324.28-2012: Methods for chemical analysis of tungsten -- Part 28: Determination of molybdenum content -- The thiocyanate spectrophotometry
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods for chemical analysis of tungsten Part 28. Determination of molybdenum content The thioyanate spectrophotometry.
ICS 77.120.99
H63
National Standards of People's Republic of China
Replacing GB/T 4324.28-1984
Chemical analysis of tungsten
Part 28. Determination of molybdenum content
Thiocyanate spectrophotometric
Part 28. Determinationofmolybdenumcontent-
Issued on. 2012-12-31
2013-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 4324 "chemical analysis of tungsten" is divided into 28 parts.
--- Part 1. Determination of lead content - flame atomic absorption spectrometry;
--- Part 2. Determination of bismuth content hydride generation atomic absorption spectrometry;
--- Part 3. Determination of tin content hydride generation atomic absorption spectrometry;
--- Part 4. Determination of antimony content hydride generation atomic absorption spectrometry;
--- Part 5. Determination of arsenic content by hydride generation atomic absorption spectrometry;
--- Part 6. Determination of iron content of phenanthroline spectrophotometry;
--- Part 7. Determination of cobalt content by inductively coupled plasma atomic emission spectrometry;
--- Part 8. Determination of the amount of nickel by inductively coupled plasma atomic emission spectrometry and flame atomic absorption spectrometry Diacetyldioxime
Gravimetric method;
--- Part 9. Determination of cadmium content by inductively coupled plasma atomic emission spectrometry and flame atomic absorption spectrometry;
--- Part 10. Determination of copper content - Flame atomic absorption spectrometry;
--- Part 11. Determination of aluminum content by inductively coupled plasma atomic emission spectrometry;
--- Part 12. Determination of the amount of silicon tetrachloride - molybdenum blue spectrophotometric method;
--- Part 13. Inductively coupled plasma calcium atomic emission spectrometry;
--- Part 14. Chlorinated Volatile residue amount after Gravimetric method;
--- Part 15. Determination of magnesium content - Flame atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry;
--- Part 16. Determination of loss on ignition - Gravimetric method;
--- Part 17. Determination of sodium content by flame atomic absorption spectrometry;
--- Part 18. Determination of potassium content by flame atomic absorption spectrometry;
--- Part 19. Determination of titanium content of two methane antipyrine spectrophotometry;
--- Part 20. vanadium content - Inductively coupled plasma atomic emission spectrometry;
--- Part 21. Determination of chromium content by inductively coupled plasma atomic emission spectrometry;
--- Part 22. manganese content - Inductively coupled plasma atomic emission spectrometry;
--- Part 23. Determination of sulfur content of combustion conductance method and frequency combustion infrared absorption method;
--- Part 24. Determination of phosphorus content - Molybdenum blue spectrophotometric method;
--- Part 25. Determination of oxygen pulse heating inert gas fusion - infrared absorption method;
--- Part 26. Determination of nitrogen pulse heating inert gas fusion - thermal conductivity method and Nessler reagent spectrophotometric method;
--- Part 27. Determination of carbon content in the high-frequency combustion infrared absorption method;
--- Part 28. Determination of molybdenum content - Thiocyanate spectrophotometric method.
This section GB/T Part of 284,324.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB/T 4324.28-1984 "chemical analysis of tungsten thiocyanate spectrophotometric determination of molybdenum content." This portion
GB/T 4324.28-1984 compared to the main technical changes are as follows.
--- Curve part of the increase applicable to the amount of molybdenum > curve 0.008% to 0.020% of the sample was drawn;
--- For the molybdenum content of > 0.008% to 0.020% of the test solution using 2cm absorption cuvette absorbance was measured;
--- Cancel the original formulation of the phenolphthalein ethanol solution.
The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.
This section is drafted. Beijing Nonferrous Metal Research Institute, Ganzhou Nonferrous Metallurgy Research Institute, Xiamen Golden Egret Special Alloy Co., Ltd.
The main drafters of this section. Tong Jian, Zhou Xinhua, Tong Ling, Liu Hongying, Huang Ting, Zhangjiang Feng.
This part of the standard replaces the previous editions are.
--- GB/T 4324.28-1984.
Chemical analysis of tungsten
Part 28. Determination of molybdenum content
Thiocyanate spectrophotometric
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.
3.1 citric acid.
3.2 n-butyl acetate.
3.3 Hydrogen peroxide (ρ = 1.10g/mL).
3.4 sulfate (11).
3.5 sulfate (124).
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.
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