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GB/T 4702.2-2008: Chromium metal -- Determination of silicon content -- The perchloric acid gravimetric method
Status: Valid GB/T 4702.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4702.2-2008 | English | 149 |
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Chromium metal -- Determination of silicon content -- The perchloric acid gravimetric method
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GB/T 4702.2-2008
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| GB/T 4702.2-1984 | English | 199 |
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Methods for chemical analysis of chromium metal--The perchloric acid dehydration-gravimetric method for the determination of silicon content
| Obsolete |
GB/T 4702.2-1984
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PDF similar to GB/T 4702.2-2008
Basic data | Standard ID | GB/T 4702.2-2008 (GB/T4702.2-2008) | | Description (Translated English) | Chromium metal -- Determination of silicon content -- The perchloric acid gravimetric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.100 | | Word Count Estimation | 5,593 | | Date of Issue | 2008-05-13 | | Date of Implementation | 2008-11-01 | | Older Standard (superseded by this standard) | GB/T 4702.2-1984 | | Quoted Standard | GB/T 4010 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.8 (Total No.121) | | 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 method for the determination of chromium perchlorate weight silicon content. This section applies to the determination of chromium in silicon content. Measuring range (mass fraction): 0. 10% to 0. 50%. | GB/T 4702.2-2008: Chromium metal -- Determination of silicon content -- The perchloric acid gravimetric method
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Chromium metal. Determination of silicon content. The perchloric acid gravimetric method
ICS 77.100
H11
National Standards of People's Republic of China
Replacing GB/T 4702.2-1984
Determination of chromium content of silicon
Perchloric acid gravimetric method
Posted 2008-05-13
2008-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This Part replaces GB/T 4702.2-1984 "chromium chemical analysis method for the determination of silicon content perchloric acid dehydration gravimetric method."
This portion of the GB/T 4702.2-1984 comparison, the main differences are as follows.
--- Increased standard warning language;
--- Added "Normative references" and "Test Report" section.
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. Minmetals (Hunan) ferroalloy limited liability company.
The main drafters of this section. Huang, Deng Zhihong, Lilong Long, Wang Yanrong.
This part of the standard replaces the previous editions are.
GB/T 4702.2-1984.
Determination of chromium content of silicon
Perchloric acid gravimetric method
Warning. Use of this section shall be a person experiences regular laboratory work. This section does not indicate that all possible 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
This section provides perchloric acid method for the determination of chromium by weight silicon content.
This section applies to the determination of chromium content of silicon. Measurement range (mass fraction). 0.10% to 0.50%.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement
Whether 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 weight perchloric acid method
3.1 Principle
Sample decomposition with hydrochloric acid, perchloric acid by smoking treatment, the silicon to form insoluble silicate. After filtration burning weighed. With hydrofluoric acid at
Li, the silica after evaporation, burning weighed, calculated by the difference between the two weights of silicon content.
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 perchloric acid, ρ1.67g/mL.
3.2.2 hydrofluoric acid, ρ1.15g/mL.
3.2.3 hydrogen peroxide, ρ1.10g/mL.
3.2.4 sulfate, 1 + 3.
3.2.5 hydrochloric acid, 1 + 5.
3.2.6 hydrochloric acid, 10 + 1.
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, the sample should be adopted 0.125mm sieve.
3.5 Analysis Steps
3.5.1 sample size
Weigh 3.000g sample, accurate to 0.0001g.
3.5.2 Blank test
Along with sample blank test.
3.5.3 Determination
3.5.3.1 The sample (3.5.1) in 300mL beaker, covered table dish, was added 60mL of hydrochloric acid (3.2.5) thermal decomposition. Join
40mL of perchloric acid (3.2.1) heated to smoke, continue heating 15min ~ 20min. Allowed to cool, add about 150mL of warm water soluble so
Of the salt is dissolved, slowly dropped 25mL ~ 30mL of hydrogen peroxide (3.2.3) the chromium reduction. Boil for about 1min, immediately slow quantitative filter paper
Filtered buildup of residue in the beaker wall with a rub scrub stick shift on filter paper, with warm hydrochloric acid (3.2.6) and washed 4 to 5 times, and then
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