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GB/T 7731.5-2021: Ferrotungsten - Determination of silicon content - Silicomolybdenum blue spectrophotometric method
Status: Valid GB/T 7731.5: Evolution and historical versions
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| GB/T 7731.5-2021 | English | 199 |
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Ferrotungsten - Determination of silicon content - Silicomolybdenum blue spectrophotometric method
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GB/T 7731.5-2021
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| GB/T 7731.5-1987 | English | 199 |
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Methods for chemical analysis of ferrotungsten. The molybdenum blue photometric method for the determination of silicon content
| Obsolete |
GB/T 7731.5-1987
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PDF similar to GB/T 7731.5-2021
Basic data | Standard ID | GB/T 7731.5-2021 (GB/T7731.5-2021) | | Description (Translated English) | Ferrotungsten - Determination of silicon content - Silicomolybdenum blue spectrophotometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Word Count Estimation | 10,120 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 7731.5-2021: Ferrotungsten - Determination of silicon content - Silicomolybdenum blue spectrophotometric method
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Ferrotungsten - Determination of silicon content - Silicomolybdenum blue spectrophotometric method
ICS 77.100
CCSH11
National Standards of People's Republic of China
Replace GB/T 7731.5-1987
Tungsten-iron-silicon content-Determination of silicon-molybdenum blue spectrophotometric method
Released on 2021-08-20
2022-03-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document is Part 5 of GB/T 7731.GB/T 7731 currently publishes the following parts.
---Determination of tungsten iron tungsten content Cinchonine gravimetric method and ammonium nitrate gravimetric method;
---Determination of tungsten, ferromanganese, periodate spectrophotometry and flame atomic absorption spectrometry;
---Determination of tungsten iron copper content dicyclohexanone oxalyl dihydrazone photometry and flame atomic absorption spectrometry;
---Determination of ferrotungsten and phosphorus content Phosphomolybdenum blue spectrophotometric method;
---Determination of tungsten iron silicon content silicon molybdenum blue spectrophotometric method;
---Determination of tungsten, iron, arsenic content, molybdenum blue photometry and inductively coupled plasma atomic emission spectrometry;
---Determination of tungsten iron tin content phenylfluorone photometric method and inductively coupled plasma atomic emission spectrometry;
---Determination of iron tungsten and antimony content Rhodamine B photometric method and inductively coupled plasma atomic emission spectrometry;
---Determination of bismuth tungsten iron bismuth iodide photometric method and inductively coupled plasma atomic emission spectrometry;
---Determination of tungsten iron carbon content infrared absorption method;
---Determination of ferro-tungsten and sulfur content infrared absorption method and combustion neutralization titration method;
---Determination of tungsten, iron and lead content by polarography and inductively coupled plasma atomic emission spectrometry.
This document replaces GB/T 7731.5-1987 "Methods for chemical analysis of ferrotungsten, molybdenum blue photometric method for the determination of silicon content", and GB/T 7731.5-1987
Compared with 1987, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Modified the measurement range from "≤1.10%" to "0.100%~1.50%" (see Chapter 1, Chapter 1 of the 1987 edition);
b) Added "anhydrous sodium carbonate, solid" (see 5.1), "hydrochloric acid, ρ=1.19g/mL" (see 5.4), "sulfuric acid (11)" (see 5.6);
c) Modified the purity of pure iron from "99.5% or more" to "99.95% or more" (see 5.14, 2.9 in the 1987 edition);
d) Modified the purity of silica, from "99.5% or more" to "99.95% or more" [see 5.15a), 1987 version 2.10];
e) Modified the addition amount of sulfuric acid (16) in the process of sample dissolution, from "adding 17mL sulfuric acid (16)" to "adding 20mL sulfur
Acid (1 6)" (see 7.3.1, 4.3.1 of the 1987 edition);
f) Modified the reagents in the color development process of the test solution, from "adding ammonium molybdate, hydrofluoric acid, ferrous ammonium sulfate" to "adding ammonium molybdate, oxalic acid,
Ferrous ammonium sulfate" (see 7.3.2, 4.3.2 of the 1987 edition);
g) Increased tolerances within the laboratory (see Chapter 9, Chapter 6 of the 1987 edition);
h) Added "Test Results Acceptance Flow Chart" (see Appendix A).
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Pig Iron and Ferroalloy Standardization Technical Committee (SAC/TC318).
Drafting organizations of this document. Jifei Ferroalloy Co., Ltd., Jiangxi Tungsten and Rare Earth Product Quality Supervision and Inspection Center, Qingdao Boxinda
Technology Co., Ltd., Ganzhou Jiang Tungsten Alloy Co., Ltd., Hebei Jinxi International Trade Co., Ltd., Metallurgical Industry Information Standards Research Institute.
The main drafters of this document. Zheng Haidong, Nie Shulan, Liu Bing, Yu Zhaoji, Zhang Yanping, Zhong Yinglan, Zhang Yunpeng, Li Jinglin, Guo Li, Guo Xiaolin,
Ye Xiaoshuang, Li Fuping, Zhang Qian.
This document was first published in 1987, and this is the first revision.
Introduction
As there are many elements involved in the detection process of ferrotungsten, the applicable scope and applicable methods of the elements are different. In order to guarantee tungsten
The iron detection standards are convenient and accurate. We have established a national standard for the analysis of different elements of ferrotungsten.
Tie. The GB/T 7731 ferro-tungsten series analysis method is the basic standard for the detection of ferro-tungsten in my country, and it is planned to be composed of the following fourteen parts. But some
The points have been abolished, and you need to pay attention to it during use.
---GB/T 7731.1 Determination of tungsten iron tungsten content Cinchonine gravimetric method and ammonium nitrate gravimetric method. The purpose is to measure the tungsten iron
For the tungsten content, the cinchonine gravimetric method and the ammonium nitrate gravimetric method are used.
---GB/T 7731.2 Determination of Tungsten Ferromanganese Content Periodate Spectrophotometry and Flame Atomic Absorption Spectrometry. Aim at
To measure the manganese content in ferrotungsten, periodate spectrophotometry and flame atomic absorption spectrometry were used.
---GB/T 7731.3 Determination of tungsten-iron-copper content. Dicyclohexanone oxalyl dihydrazone spectrophotometry and flame atomic absorption spectrometry. Item
The method is to measure the copper content in ferro tungsten, using dicyclohexanone oxalyl dihydrazone spectrophotometry and flame atomic absorption spectrometry.
---GB/T 7731.4 Determination of Tungsten Ferrophosphorus Content Phosphomolybdenum Blue Spectrophotometric Method. The purpose is to measure the phosphorus content in ferro tungsten,
Using phosphomolybdenum blue spectrophotometry.
---GB/T 7731.5 Determination of tungsten ferrosilicon content Silicon molybdenum blue spectrophotometric method. The purpose is to measure the silicon content in ferro tungsten,
Using silicon molybdenum blue spectrophotometry.
---GB/T 7731.6 Determination of tungsten, iron, arsenic content, molybdenum blue photometry and inductively coupled plasma atomic emission spectrometry. Item
The purpose is to measure the arsenic content in ferro-tungsten, using molybdenum blue photometry and inductively coupled plasma atomic emission spectrometry.
---GB/T 7731.7 Determination of tungsten-iron-tin content-Phenylfluorone photometric method and inductively coupled plasma atomic emission spectrometry
Law. The purpose is to measure the tin content in ferro tungsten, using phenylfluorone photometry and inductively coupled plasma atomic emission light
Spectrum method.
---GB/T 7731.8 Determination of tungsten iron antimony content Rhodamine B photometric method and inductively coupled plasma atomic emission spectrometry
Law. The purpose is to measure the antimony content in ferro tungsten, using rhodamine B photometry and inductively coupled plasma atomic emission light
Spectrum method.
---GB/T 7731.9 Determination of bismuth tungsten iron bismuth iodide photometric method and inductively coupled plasma atomic emission spectrometry.
The purpose is to measure the bismuth content in ferro-tungsten, using bismuth iodide photometry and inductively coupled plasma atomic emission spectrometry.
---GB/T 7731.10 Determination of tungsten iron carbon content infrared absorption method. The purpose is to measure the carbon content in ferro tungsten, using
Infrared absorption method.
---GB/T 7731.11 Ferrotungsten Chemical Analysis Method Coulometric Method for the Determination of Carbon Content. The purpose is to measure the carbon content in ferro tungsten, using
Coulomb method. This part has been abolished.
---GB/T 7731.12 Determination of tungsten iron and sulfur content infrared absorption method and combustion neutralization titration method. The purpose is to measure tungsten
The sulfur content in iron uses infrared absorption method and combustion neutralization titration method.
---GB/T 7731.13 Methods for chemical analysis of ferrotungsten. Combustion neutralization titration method for the determination of sulfur content. The purpose is to measure the sulfur in ferro tungsten
For the content, use the combustion neutralization titration method. This part has been abolished.
---GB/T 7731.14 Determination of tungsten, iron and lead content by polarography and inductively coupled plasma atomic emission spectrometry. Purpose
To measure the lead content in ferro-tungsten, polarography and inductively coupled plasma atomic emission spectrometry are used.
Tungsten-iron-silicon content-Determination of silicon-molybdenum blue spectrophotometric method
Warning---Personnel using this document should have formal laboratory work experience. This document does not indicate all possible safety issues
question. The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.
1 Scope
This document specifies the silicon molybdenum blue spectrophotometric method for the determination of silicon content in ferro-tungsten.
This document is applicable to the determination of silicon content in ferro-tungsten. Measuring range (mass fraction). 0.100%~1.50%.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 4010 Collection and preparation of samples for chemical analysis of ferroalloys
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 8170 Numerical rounding rules and the expression and determination of limit values
3 Terms and definitions
There are no terms and definitions that need to be defined in this document.
4 Principle
The sample is decomposed with oxalic acid and hydrogen peroxide, and tungsten acid is oxidized with potassium permanganate to form tungstic acid, which is filtered. Add ammonium molybdate and ferrous sulfate to the filtrate
Ammonium is reacted to generate silicon molybdenum blue, and its absorbance is measured at a wavelength of 810nm with a spectrophotometer to calculate the mass fraction of silicon.
5 Reagents
Unless otherwise specified, only use analytical reagents.
5.1 Water, GB/T 6682, level three.
5.2 Anhydrous sodium carbonate, solid.
5.3 Oxalic acid, solid.
5.4 Hydrochloric acid, ρ=1.19g/mL.
5.5 Hydrofluoric acid, ρ=1.15g/mL.
5.6 Sulfuric acid (1 1).
5.7 Sulfuric acid (1 6).
5.8 Hydrogen peroxide (30%).
5.9 Hydrogen peroxide (1 9).
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