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GB/T 7731.2-2007: Ferrotungsten -- Determination of manganese content -- The periodate spectrophotometric method and the flame atomic absorption spectrometric method
Status: Valid GB/T 7731.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7731.2-2007 | English | 209 |
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Ferrotungsten -- Determination of manganese content -- The periodate spectrophotometric method and the flame atomic absorption spectrometric method
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GB/T 7731.2-2007
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| GB/T 7731.2-1987 | English | 199 |
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Methods for chemical analysis of ferrotungsten--The sodium periodate photometric method for the determination of manganese content
| Obsolete |
GB/T 7731.2-1987
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PDF similar to GB/T 7731.2-2007
Basic data | Standard ID | GB/T 7731.2-2007 (GB/T7731.2-2007) | | Description (Translated English) | Ferrotungsten -- Determination of manganese content -- The periodate spectrophotometric method and the flame atomic absorption spectrometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.100 | | Word Count Estimation | 8,811 | | Date of Issue | 2007-09-11 | | Date of Implementation | 2008-02-01 | | Older Standard (superseded by this standard) | GB/T 7731.16-1999; GB/T 7731.2-1987 | | Quoted Standard | GB/T 4010 | | Regulation (derived from) | National Standard Approval Announcement 2007 No.11 (Total No.111) | | 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 manganese content-periodate spectrophotometric and flame atomic absorption spectrometry. This section applies to the determination of tungsten iron and manganese content, including periodate spectrophotometric and flame atomic absorption spectrometry. Measured Warning-this part of the staff should use the practical experience of formal laboratory work. This section does not indicate that all possible safety problems. Users are responsible for taking appropriate safety and health practices and to ensure compliance with the relevant national regulations. Given range (mass fraction): 0. 05% to 0. 70 %. | GB/T 7731.2-2007: Ferrotungsten -- Determination of manganese content -- The periodate spectrophotometric method and the flame atomic absorption spectrometric method
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Ferrotungsten. Determination of manganese content. The periodate spectrophotometric method and the flame atomic absorption spectrometric method
ICS 77.100
H11
National Standards of People's Republic of China
Replacing GB/T 7731.2-1987, GB/T 7731.16-1999
Determination of tungsten content of Fe, Mn
Periodate spectrophotometry and
Flame Atomic Absorption Spectrometry
Posted 2007-09-11
2008-02-01 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 instead of GB/T 7731.2-1987 "spectrophotometric determination of tungsten chemical analysis of iron and manganese, sodium periodate amount"
And GB/T 7731.16-1999 "Methods for chemical analysis of tungsten iron flame atomic absorption spectrometric method for the determination of manganese content."
This portion of the GB/T 7731.2-1987 and GB/T 7731.16-1999 comparison, in addition to editorial changes, the right
GB/T 7731.2-1987 mainly for the following technical modifications.
--- The measuring range of less than 0.50%, - 0.70% to 0.05%;
--- Dissolving the nitric acid - hydrofluoric acid decomposition, sulfuric smoke flooding fluorine instead of oxalic acid - hydrogen peroxide decomposition;
--- Chromogenic assay medium by a single phosphate to parathion mixed acid medium;
--- Oxidising agent instead of sodium periodate and potassium periodate or sodium periodate;
--- By the 530nm wavelength was measured to 525nm.
This part is proposed by the China Iron and Steel Association.
This section is under the jurisdiction of Metallurgical Industry Information Standards Institute.
This section is drafted. Sichuan Investment Emei Ferroalloy (Group) Co., Ltd.
The main drafters of this section. should Tang Hua, Fang Yan, Wang Yuan.
This part of the standard replaces the previous editions are.
--- GB/T 7731.2-1987;
--- GB/T 7731.16-1999.
Determination of tungsten content of Fe, Mn
Periodate spectrophotometry and
Flame Atomic Absorption Spectrometry
Warning --- Use this section shall be a person experiences regular laboratory work. This section does not point out all possible security asked
question. 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 determination of manganese content by periodate spectrophotometric method and the flame atomic absorption spectrometry.
This section applies to the determination of tungsten content of iron and manganese, including periodate spectrophotometric method and the flame atomic absorption spectrometry. Measurement range
(Mass fraction). 0.05% to 0.70%.
2 Normative references
The following documents contain provisions which, through reference to GB/T 7731 to the present, constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research 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. periodate spectrophotometry
3.1 Principle
Sample with oxalic acid - hydrogen peroxide decomposition, to get rid of phosphoric acid micro smoke and hydrogen peroxide. In dilute phosphoric acid medium, or high potassium iodate
Sodium periodate oxidation of manganese to permanganate, 525nm wavelength measured absorbance on a spectrophotometer.
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 High potassium iodate (or sodium periodate), a solid.
3.2.2 oxalic acid, solid.
3.2.3 hydrogen peroxide, ρ1.10g/mL.
3.2.4 phosphoric acid, ρ1.70g/mL.
3.2.5 does not contain water reducing substance. in 1000mL of water were added 20mL sulfuric acid (1 + 1), under the micro-boiling state adding a small amount (about
2g) and potassium periodate or sodium periodate (3.2.1), and held for about 10min. Cooling spare.
3.2.6 Manganese standard solution.
Weigh 0.1000g Jinzhumeng [mass fraction is greater than 99.9%, pre-washed to remove surface oxides in sulfuric acid (5 + 95), remove,
Now clean, washed with water, and washed 2 or 3 times with ethanol, and air-dried to use] placed in 300mL beaker, add 20mL
Hydrochloric acid (1 + 1), 20 mL of sulfuric acid (1 + 1), dissolved by heating, and evaporated to take the drive out white smoke of sulfuric acid, hydrochloric acid, cooled to room temperature. Moved to 1000mL
Volumetric flask, dilute with water to volume, and mix. This solution 1mL manganese 100μg.
3.3 Instrument
Analysis using common laboratory instruments.
3.4 Sampling and Preparation
In accordance with the provisions of GB/T 4010 will be sampling and sample preparation. Specimens shall be by 0.088mm sieve.
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