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GB/T 24230-2009: Chromium ores and concentrates -- Determination of chromium content -- Titrimetric method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 24230-2009 | English | 189 |
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Chromium ores and concentrates -- Determination of chromium content -- Titrimetric method
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GB/T 24230-2009
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Basic data | Standard ID | GB/T 24230-2009 (GB/T24230-2009) | | Description (Translated English) | Chromium ores and concentrates -- Determination of chromium content -- Titrimetric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D33 | | Classification of International Standard | 73.060.30 | | Word Count Estimation | 8,881 | | Date of Issue | 2009-07-15 | | Date of Implementation | 2010-04-01 | | Adopted Standard | ISO 6331-1983, MOD | | Regulation (derived from) | National Standard Approval Announcement 2009 No.9 (Total No.149) | | 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 titration Chromium ores and concentrates of chromium content. This standard applies to the determination of chromium ores and concentrates Chromium chromium content. Measuring range (expressed in Cr mass fraction): > 7. 0%, the standard shall comply with the relevant provisions of GB/T 24228 's. | GB/T 24230-2009: Chromium ores and concentrates -- Determination of chromium content -- Titrimetric method
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Chromium ores and concentrates. Determination of chromium content. Titrimetric method
ICS 73.060.30
D33
National Standards of People's Republic of China
Chromium ores and concentrates
Determination of chromium content titration
(ISO 6331. 1983, MOD)
Posted 2009-07-15
2010-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revised standard adopts ISO 6331. 1983 "Chromium ores and concentrates - Determination of chromium content titration" (in English).
This standard and ISO 6331. 1983 compared to the main job of the following changes.
--- "2 Normative references" in place of national standards with international standards corresponding;
--- The "7.2 Sample volume" by a modification of 0.5g 0.25g;
--- Added "7.1 Determination of times";
--- Added "7.3 blank test and verification test";
--- Added "6 sampling and sample preparation";
--- Added "10 test report."
The standard proposed by China Iron and Steel Association.
This standard by the National Standardization Technical Committee of pig iron and ferroalloy.
This standard was drafted. Tianjin People's Republic of China Exit Inspection and Quarantine, metallurgical industry Information Standards Institute, Ningbo Inspection and
Phytophthora Institute of Science and Technology.
The main drafters of this standard. Gu Songhai, Su Mingyue, Wei Hongbing, Li Fengyun, from Madrid, Wang Hong, Yao Chuangang, Yangli Fei, Lin Zhenxing.
Chromium ores and concentrates
Determination of chromium content titration
Warning --- personnel should use this standard regular laboratory work experience. This standard 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 state laws and regulations.
1 Scope
This standard specifies the method for the determination titration Chromium ores and concentrates chromium content.
This standard applies to the determination of chromium and chromium ore concentrate chromium content. Measurement range (Cr expressed in mass fraction). > 7.0% this mark
Associate shall comply with the relevant provisions of GB/T 24228 of.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
GB/T 12805 Laboratory glassware burette (GB/T 12805-1991, neqISO 385. 1984)
GB/T 12806 Laboratory glassware single marking flask (GB/T 12806-1991, eqvISO 1042. 1983)
GB/T 12808 standard laboratory glassware single line pipette (GB/T 12808-1991, eqvISO 648. 1977)
GB/T 24228 Chromium ores and concentrates - General method (GB/T 24228-2009, ISO 6629. 1981,
MOD)
GB/T 24220 chrome ore samples were analyzed for moisture intrudes Gravimetric method (GB/T 24220-2009, ISO 6129. 1981,
MOD)
GB/T 24243 chrome ore samples taken parts (GB/T 24243-2009, ISO 6153. 1989, IDT)
ISO 6154 chrome ore sample preparation
Principle 3
Sample molten sodium peroxide, water-leached melt, sulfuric acid and the hydrogen peroxide is removed by boiling. In the silver nitrate catalyst, using
Ammonium persulfate chromium oxide (Ⅲ) ion chromate. Ferrous ammonium sulfate titration of chromium (Ⅵ), and then potassium permanganate standard solution to back titration end point,
Potentiometric titration or direct titration of chromium (Ⅵ).
4 Reagents
Analysis Unless otherwise stated, use only reagents of recognized analytical grade and distilled water or equivalent purity of its water, in line with GB/T 6682
Provisions.
4.1 Sodium peroxide (Na2O2), dry powder.
Note. Sodium peroxide should be as dry as possible, once agglomeration can not be used.
4.2 urea.
4.3 sulfate, ρ1.84g/mL.
Sulfate 4.4, 1 + 1.
4.5 sulfate, 1 + 4.
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