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GB/T 7731.6-2008: Ferrotungsten -- Determination of arsenic content -- The molybdenum blue photometric method and inductively coupled plasma-atomic emission spectrometry
Status: Valid GB/T 7731.6: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7731.6-2008 | English | 209 |
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Ferrotungsten -- Determination of arsenic content -- The molybdenum blue photometric method and inductively coupled plasma-atomic emission spectrometry
| Valid |
GB/T 7731.6-2008
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| GB/T 7731.6-1987 | English | 199 |
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Methods for chemical analysis of freeotungaten--The molybdenum blue photometric method for the determination of arsenic content
| Obsolete |
GB/T 7731.6-1987
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PDF similar to GB/T 7731.6-2008
Basic data | Standard ID | GB/T 7731.6-2008 (GB/T7731.6-2008) | | Description (Translated English) | Ferrotungsten -- Determination of arsenic content -- The molybdenum blue photometric method and inductively coupled plasma-atomic emission spectrometry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.100 | | Word Count Estimation | 9,918 | | Date of Issue | 2008-08-19 | | Date of Implementation | 2009-04-01 | | Older Standard (superseded by this standard) | GB/T 7731.6-1987 | | Quoted Standard | GB/T 4010 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.14 (Total No.127) | | 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 determination of arsenic content of iron in tungsten molybdenum blue photometric spectrometry and inductively coupled plasma atomic emission. This section applies to the determination of tungsten iron arsenic content. Molybdenum blue spectrophotometric measurement range (mass fraction): 0. 010% to 0. 10%, inductively coupled plasma atomic emission spectrometry range (mass fraction): 0. 010% to 0. 20 %. | GB/T 7731.6-2008: Ferrotungsten -- Determination of arsenic content -- The molybdenum blue photometric method and inductively coupled plasma-atomic emission spectrometry
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Ferrotungsten. Determination of arsenic content. The molybdenum blue photometrie method and inductively coupled plasma-atomic emission spectrometry
ICS 77.100
H11
National Standards of People's Republic of China
Replacing GB/T 7731.6-1987
Determination of tungsten iron arsenic and molybdenum blue spectrophotometry
Inductively coupled plasma atomic emission spectrometry
Posted 2008-08-19
2009-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This section GB/T 7731 is to GB/T 7731.6-1987 "spectrophotometric determination of iron chemical analysis of tungsten and molybdenum blue arsenic amount" of repair
Set, including molybdenum blue photometric method and inductively coupled plasma atomic emission spectrometry analysis method two.
This Part replaces GB/T 7731.6-1987.
This portion of the GB/T 7731.6-1987 comparison, the main changes are as follows.
--- Molybdenum blue spectrophotometric method for the preparation of standard text format of the specification;
--- Increased by inductively coupled plasma atomic emission spectrometry.
Appendix A of this section is an informative annex.
This part is proposed by the China Iron and Steel Association.
This part of pig iron and ferroalloy by the National Standardization Technical Committee.
This section is drafted. Sinosteel Jilin Ferroalloy Co., Ltd.
The main drafters of this section. phosphorus, copper Bi Jun, Zhang Yunpeng, high Yumin, Yuan Ping.
This part of the standard replaces the previous editions are.
--- GB/T 7731.6-1987.
Determination of tungsten iron arsenic and molybdenum blue spectrophotometry
Inductively coupled plasma atomic emission spectrometry
Warning. Use of practical experience GB/T 7731 this part of the staff should have regular laboratory work. This section does not indicate all available
Energy security issues. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.
1 Scope
GB/T 7731 provisions of this part of the iron determination of tungsten molybdenum blue photometric method and inductively coupled plasma atomic emission spectrometry
Arsenic content.
This section applies to the determination of tungsten iron arsenic content. Molybdenum blue spectrophotometric measurement range (mass fraction). 0.010% to 0.10%; inductively coupled
Plasma atomic emission spectrometry range (mass fraction). 0.010% to 0.20%.
2 Normative references
The following documents contain provisions which, through reference to GB/T 7731 to the present, constitute provisions of this section. Every note has a reference date
Documents, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Research into whether the parties to the agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 4010 alloy chemical analysis and preparation of samples
3 Method One. molybdenum blue photometric
3.1 Principle
Sample with sodium peroxide, sodium carbonate melt, after leaching in sulfuric acid solution containing tartaric acid in hydrogen sulfide arsenic and copper, tin and other co-precipitation
Isolated, dissolved in nitric acid, sulfuric acid, oxidation with sodium hydroxide. Sulfuric acid solution to adjust the pH, add ammonium molybdate and hydrazine sulfate reaction of molybdenum
Blue, measuring absorbance at 810nm wavelength.
3.2 Reagents and materials
Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water.
3.2.1 sodium peroxide, solid.
3.2.2 sodium carbonate, a solid (dry).
3.2.3 tartaric, solid.
3.2.4 nitrate, ρ1.42g/mL.
3.2.5 sulfate, ρ1.84g/mL.
3.2.6 ammonium hydroxide, ρ0.90g/mL.
3.2.7 nitric acid, 1 + 1.
3.2.8 sulfuric acid, 1 + 1.
3.2.9 sulfate, 1 + 10.
3.2.10 ammonium hydroxide, 1 + 1.
3.2.11 hydrogen sulfide, ferrous sulfide and dilute hydrochloric acid occurs Kipp generator reaction.
3.2.12 sodium hydroxide solution, 150g/L.
3.2.13 potassium permanganate solution, 5g/L.
3.2.14 ammonium molybdate solution, 10g/L, weighed 1g paramolybdate dissolved and diluted with water to 100mL.
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