GB/T 14352.17-2010Methods for chemical analysis of tungsten ores and molybdenum ores - Part 17: Determination of tellurium content (English PDF)

Foreword

GB/T 14352 "tungsten ores and molybdenum ores chemical analysis methods," a total of 18 sections of law.

--- 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 17.

This Part replaces GB/T 14352.17-1993 "tungsten ores and molybdenum ores - Methods for chemical analysis Butyl Rhodamine B spectrophotometric determination of tellurium content." Section compared with the GB/T 14352.17-1993, major changes in the following.

--- Increased alert, warnings;

--- Modify the sample drying temperature.

Appendix A of this section is an informative annex.

1 Scope

This section GB/T 14352 provides for tungsten ores and determination of tellurium content of molybdenum ore.

This Part applies to tungsten ores and determination of tellurium content of molybdenum ore.

Measuring range. 0.5µg/g ~ 100µg/g of tellurium.

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, 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

3 Principle

Sample nitric acid - hydrofluoric acid - sulfuric acid decomposing, hydrochloric acid medium precipitate was removed by filtration. Co-precipitating agent in the presence of arsenic, seq Asia Sodium tellurium reduction to the monomer. Sulfuric acid and hydrogen bromide solution, tellurium bromide anions and Butyl Rhodamine B generates a blue-purple solid compound Substance, extracted benzene. On a spectrophotometer at the wavelength of 565nm at measuring the absorbance of the organic phase, calculate the amount of tellurium.

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 Benzene.

Nitrate 4.3 (rho1.40g/mL).

4.4 Hydrofluoric acid (rho1.13g/mL), Warning. Toxic and corrosive hydrofluoric acid, the operation should wear gloves to prevent skin contact.

4.5 Hydrogen peroxide.

4.6 Sulfuric acid (11), Warning. improper dilution risk prone.

4.7 Hydrochloride (11).

4.8 Hydrochloric acid (1585, containing a small amount of sodium hypophosphite).

4.9 Copper sulphate solution (156g/L).

Weigh 15.6g of copper sulfate (CuSO4 · 5H2O), was added 4mL sulfuric acid (4.6), dilute with water to 100mL, dissolved under stirring. This solution 1mL solution containing copper sulfate 100mg.

4.10 Disodium hydrogen arsenate solution (4.2g/L).

Weigh 0.42g disodium hydrogen arsenate (Na2HAsO4 · 7H2O) were dissolved in water and diluted with water to 100mL, shake, solution 1mL Arsenic 1mg.