GB/T 14506.13-2010Methods for chemical analysis of silicate rocks - Part 13: Determination of sulfur content (English PDF)

Foreword

GB/T 14506 "Methods for chemical analysis of silicate rocks" 30 consists of the following components.

--- Part 1. Determination of water absorption;

--- Part 2. Determination of combined water;

--- Part 3. Determination of the amount of silica;

--- Part 4. Determination of the amount of aluminum oxide;

--- Part 5. Determination of total iron content;

--- Part 6. Determination of calcium oxide content;

--- Part 7. Determination of the amount of magnesium oxide;

--- Part 8. Determination of the amount of titanium dioxide;

--- Part 9. Determination of the amount of phosphorus pentoxide;

--- Part 10. Determination of the amount of manganese oxide;

--- Part 11. Determination of the amount of sodium hydroxide and oxide;

--- Part 12. Determination of the amount of fluorine;

--- Part 13. Determination of sulfur content;

--- Part 14. Determination of ferrous oxide;

--- Part 15. Determination of the amount of lithium;

--- Part 16. Determination of the amount of rubidium;

--- Part 17. Determination of the amount of strontium;

--- Part 18. Determination of copper content;

--- Part 19. Determination of lead content;

--- Part 20. Determination of the amount of zinc;

--- Part 21. Determination of the amount of nickel and cobalt;

--- Part 22. Determination of the amount of vanadium;

--- Part 23. Determination of chromium;

--- Part 24. Determination of cadmium content;

--- Part 25. Determination of molybdenum and tungsten;

--- Part 26. Determination of cobalt content;

--- Part 27. Determination of nickel content;

--- Part 28. Determination of the amount of 16 major and minor components;

Part --- 29. 22 the amount of rare earth element determination;

--- Part 30. Determination of the amount of 44 elements.

This section is Part 13 of GB/T 14506.

This Part replaces GB/T 14506.13-1993 "Silicate rocks combustion iodometric method for the determination of sulfur content." Section compared with the GB/T 14506.13-1993 main change this as follows.

--- Increasing the normative references;

--- Increased alert, warnings;

--- The weighed sample quantity and dispensing solutions to a list representation.

1 Scope

GB/T 14506 provisions of this part of the determination of the amount of sulfur in silicate rocks.

This section applies to the amount of sulfur in the determination of silicate rocks, is also applicable to the measurement of soil and stream sediments sulfur content. Measurement range. from 0.01% to 1% sulfur content.

2 Normative references

The following documents contain provisions which, through reference GB/T 14506 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 14506.1 Silicate rocks - Part 1: Determination of water adsorption

3 Principle

Sample is mixed with copper oxide high-temperature tube furnace (1250 °C ~ 1350 °C) burning in an oxygen stream, so that various forms of sulfur conversion into two Sulfur dioxide gas to escape, absorb with dilute hydrochloric acid solution containing starch indicator, standard titration solution containing potassium iodate titration of potassium iodide, the count Operators sulfur content.

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 Sodium hydroxide.

4.2 Sulfate (rho1.84g/mL). Warning --- improper dilution risk prone.

4.3 Sulfate (120).

4.4 Hydrochloride (rho1.19g/mL).

4.5 Hydrochloric acid c (HCl) = 1mol/L.

4.6 Anhydrous calcium chloride.

4.7 Potassium iodide.

4.8 Potassium iodide solution (40g/L).

4.9 Copper sulphate solution (50g/L).

4.10 Potassium permanganate solution (50g/L).

4.11 Copper oxide wire (less than 0.001% sulfur content).

4.12 potassium iodate titration standard solution preparation and calibration.

a) potassium iodate titration standard solution c (KIO3) = 1.040mmol/L. Weigh 0.2225g advance after 105 °C drying 2h potassium iodate (KIO3), dissolved in a 1g of potassium iodide (4.7) and 1g Sodium hydroxide (4.1) in water and transferred to 1000mL brown volumetric flask, dilute to the mark, shake;

b) potassium iodate titration standard solution c (KIO3) = 0.5196mmol/L.