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GB/T 6730.30-2017: Iron ores -- Determination of chromium content -- Diphenyl carbazide spectrophotometric method
Status: Valid GB/T 6730.30: Evolution and historical versions
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| GB/T 6730.30-2017 | English | 199 |
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Iron ores -- Determination of chromium content -- Diphenyl carbazide spectrophotometric method
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GB/T 6730.30-2017
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| GB/T 6730.30-1986 | English | 199 |
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Methods for chemical analysis of iron ores. The diphenyl carbazide photometric method for the determination of chromium content
| Obsolete |
GB/T 6730.30-1986
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PDF similar to GB/T 6730.30-2017
Basic data | Standard ID | GB/T 6730.30-2017 (GB/T6730.30-2017) | | Description (Translated English) | Iron ores -- Determination of chromium content -- Diphenyl carbazide spectrophotometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D31 | | Classification of International Standard | 73.060.10 | | Word Count Estimation | 10,190 | | Date of Issue | 2017-09-07 | | Date of Implementation | 2018-06-01 | | Older Standard (superseded by this standard) | GB/T 6730.30-1986 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's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 | GB/T 6730.30-2017: Iron ores -- Determination of chromium content -- Diphenyl carbazide spectrophotometric method
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Iron ores - Determination of chromium content - Diphenyl carbazide spectrophotometric method
ICS 73.060.10
D31
National Standards of People's Republic of China
Replacing GB/T 6730.30-1986
Iron ores - Determination of chromium content
Diphenyl carbazide spectrophotometry
2017-09-07 Posted
2018-06-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Foreword
GB/T 6730 "iron ore" is divided into dozens of sections.
This section GB/T 6730 Part 30.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB/T 6730.30-1986 "chemical analysis of iron ores diphenylcarbazide spectrophotometric method for the determination of chromium content," headquarters
Points compared with GB/T 6730.30-1986, in addition to some editorial changes, the main technical changes are as follows.
--- The standard name was changed to "Determination of chromium content of iron ore diphenylcarbodihydrazide spectrophotometry";
--- Added "warning" "normative references" "instrument" and "test report" chapter and content, the original chapter number has been adjusted accordingly;
--- Clear and standardized sample and sample preparation of the specific requirements;
--- "sample size" to "sample volume", and clear the weighing accuracy;
--- Deleted the coefficient (1) in the coefficient "K" and "K" statement.
This part is proposed by China Iron and Steel Association.
This part of the National Iron Ore and Direct Reduced Iron Standardization Technical Committee (SAC/TC317) centralized.
This part of the revised unit. Ningbo Inspection and Quarantine Science and Technology Institute, Shanghai Entry-Exit Inspection and Quarantine Bureau, Metallurgical Industry Information Standards
Institute.
The main drafters of this section. Liao Haiping, Ren Liping, He Yang, pay Ran, Zhang Jianbo, Chen Hehai, Ren Chunsheng, Chen Zhibin.
This part of the standard replaces the previous version of the release.
--- GB/T 6730.30-1986.
Iron ores - Determination of chromium content
Diphenyl carbazide spectrophotometry
Warning --- personnel using this section should have formal laboratory work experience. This section does not indicate all possible safety issues
question. It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the requirements of the relevant state laws and regulations.
1 Scope
GB/T 6730 provisions of this part of the diphenylcarbazide spectrophotometric determination of chromium content.
This section applies to iron ore, iron ore, sinter and pellets Determination of chromium content. Measuring range (mass fraction) .0.010% ~
0.500%.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682 analytical laboratory water specifications and test methods
Preparation of pre-dried samples for analysis of iron ores GB/T 6730.1
GB/T 8170 rounded repair rules and limit values of the representation and judgment
GB/T 10322.1 Iron ore sampling and sample preparation methods
GB/T 12806 laboratory glassware single standard line capacity bottle
GB/T 12807 Laboratory glassware graduated pipette
GB/T 12808 laboratory glassware single standard pipette
3 principle
The sample was dissolved by alkali melting, water leaching and dry filtration, and the supernatant was taken. In a sulfuric acid (0.1 mol/L) medium, hexavalent chromium and diphenylcarbodiimide
Hydrazine generates a soluble fuchsine complex. Absorbance was measured at 545 nm. To determine the chromium content.
Vanadium interfere with this law. When the vanadium content is less than.200μg, can be placed in the color after 30min to eliminate interference; when the vanadium content is greater than
200μg or vanadium content than the chromium content of 10 times, with 8-hydroxyquinoline - chloroform extraction and separation.
4 reagent
Unless otherwise stated in the analysis, only the use of analytical reagents and meet the GB/T 6682 provisions of more than three distilled water or its purity phase
When the water.
4.1 Sodium peroxide.
4.2 anhydrous sodium carbonate.
4.3 Ferric oxide, purity ≥99.99%.
4.4 Trichloromethane.
4.5 sulfuric acid, 1 9.
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