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GB/T 14352.16-2010: Methods for chemical analysis of tungsten ores and molybdenum ores -- Part 16: Determination of selenium content
Status: Valid GB/T 14352.16: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 14352.16-2010 | English | 189 |
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Methods for chemical analysis of tungsten ores and molybdenum ores -- Part 16: Determination of selenium content
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GB/T 14352.16-2010
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| GB/T 14352.16-1993 | English | 199 |
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Methods for chemical analysis of tungsten ores and molybdenum ores. Determination of selenium content-3, 3-diaminobenzidine photometric method
| Obsolete |
GB/T 14352.16-1993
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Basic data | Standard ID | GB/T 14352.16-2010 (GB/T14352.16-2010) | | Description (Translated English) | Methods for chemical analysis of tungsten ores and molybdenum ores -- Part 16: Determination of selenium content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D40 | | Classification of International Standard | 73.060 | | Word Count Estimation | 8,896 | | Date of Issue | 2010-11-10 | | Date of Implementation | 2011-02-01 | | Older Standard (superseded by this standard) | GB/T 14352.16-1993 | | Quoted Standard | GB/T 6682; GB/T 14505 | | Regulation (derived from) | National Standard Approval Announcement 2010 No.8 (Total No.163) | | 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 tungsten ores, determination of the amount of selenium in molybdenum ores. This section applies to tungsten ores, determination of molybdenum ore selenium content. | GB/T 14352.16-2010: Methods for chemical analysis of tungsten ores and molybdenum ores -- Part 16: Determination of selenium content
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Methods for chemical analysis of tungsten ores and molybdenum ores Part 16. Determination of selenium content
ICS 73.060
D40
National Standards of People's Republic of China
Replacing GB/T 14352.16-1993
Tungsten ores and molybdenum ores - Methods for chemical analysis
Part 16. Determination of Selenium
Part 16. Determinationofseleniumcontent
Issued on. 2010-11-10
2011-02-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 14352 "tungsten ores and molybdenum ores chemical analysis methods," a total of 18 parts.
--- Part 1. Determination of tungsten;
--- Part 2. Determination of molybdenum;
--- Part 3. Determination of copper content;
--- Part 4. Determination of lead content;
--- Part 5. Determination of the amount of zinc;
--- Part 6. Determination of cadmium content;
--- Part 7. Determination of cobalt content;
--- Part 8. Determination of nickel content;
--- Part 9. Determination of sulfur content;
--- Part 10. Determination of arsenic content;
--- Part 11. Determination of the amount of bismuth;
--- Part 12. determination of silver;
--- Part 13. Determination of tin;
--- Part 14. Determination of gallium;
--- Part 15. Determination of germanium content;
--- Part 16. Determination of the amount of selenium;
--- Part 17. Determination of tellurium content;
--- Part 18. Determination of the amount of rhenium.
This section GB/T 14352 Part 16.
This Part replaces GB/T 14352.16-1993 "tungsten ores and molybdenum ores chemical analysis of 3,3'-diaminobenzidine Spetrophotometry
Given the amount of selenium. "
Section compared with the GB/T 14352.16-1993, major changes in the following.
--- Increased alert, warnings;
--- Modify the sample drying temperature.
Appendix A of this section is an informative annex.
This section presents the People's Republic of China Ministry of Land Resources.
This part of the National Standardization Technical Committee under the jurisdiction of Land and Resources.
This section is responsible for drafting. National geology test center.
This section is drafted. Jiangsu Provincial Institute of Geological Survey (Ministry of Land and Mineral Resources Supervision and Testing Center, Nanjing).
The main drafters of this section. Zhang new, CAI Yu Man.
This part of the standard replaces the previous editions are.
--- GB/T 14352.16-1993.
Tungsten ores and molybdenum ores - Methods for chemical analysis
Part 16. Determination of Selenium
Warning. Use of this section a person shall be regular laboratory work experience. 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 GB/T 14352 provides for tungsten ores and molybdenum ores in the determination of selenium content.
This Part applies to tungsten ores and determination of selenium content of molybdenum ore.
Measuring range. 2μg/g ~ 500μg/g of selenium.
2 Normative references
The following documents contain provisions which, through reference GB/T 14352 in this section 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.
Laboratory use specifications and test methods GB/T 6682 Analysis
GB/T 14505 method for chemical analysis of rocks and ores General rules and regulations
Principle 3
Sample with nitric acid - hydrofluoric acid - sulfuric acid decomposition in hydrochloric acid medium, the hypophosphite reducing monomer selenium and arsenic co-precipitation. Solution
When pH2 ~ pH3, tetravalent selenium and 3,3'-diaminobenzidine generate yellow complex at pH6 ~ pH9 time can be as benzene, toluene and the like have
Quantitative extraction solvent, on a spectrophotometer at the wavelength of 420nm at the absorbance was measured to calculate the amount of selenium.
4 Reagents
Unless otherwise stated in this section are consistent with the use of analytical reagent and GB/T 6682 analytical laboratory use in the analysis.
4.1 hypophosphite.
4.2 over anhydrous sodium sulfate.
4.3 Toluene (ρ0.863g/mL).
4.4 hydrofluoric acid (ρ1.13g/mL), Warning. Toxic and corrosive hydrofluoric acid, the operation should wear gloves to prevent skin contact.
Nitrate 4.5 (ρ1.40g/mL).
4.6 hydrochloride (ρ1.19g/mL).
4.7 hydrochloride (11).
4.8 hydrochloric acid (13, containing a small amount of sodium hypophosphite).
4.9 sulfuric acid (11), Warning. improper dilution risk prone.
4.10 copper sulphate solution (156g/L).
Weigh 15.6g of copper sulfate (CuSO4 · 5H2O), was added to 4mL selenium sulfate (11), dilute with water to 100mL, dissolved under stirring.
1mL solution containing copper sulfate 100mg.
Note 1. Go selenium sulfate (11) Preparation. Take 100mL sulfuric acid (4.9), was added 5mL hydrobromide (ρ1.50g/mL), placed on a hot plate heated to take sulfur trioxide
After removing smoke, cooled, mixed with an equal volume of water.
Note 2. The copper chloride may also be used.
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