GB/T 14506.24-2010Methods for chemical analysis of silicate rocks - Part 24: Determination of cadmium 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 GB/T 14506 of Part 24.

This Part replaces GB/T 14506.24-1993 "Silicate rocks - hydrochloric acid - potassium iodide - tetraethyl bromide (iodide), ammonium Determination of cadmium content "medium polarographic method.

Section compared with the GB/T 14506.24-1993 main change this as follows.

--- Increasing the normative references;

--- Increased warning, warning.

This section presents the People's Republic of China Ministry of Land Resources.

1 Scope

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

This section applies to the amount of cadmium determination in silicate rocks, is also applicable to the determination of cadmium in soil and stream sediment volume. Measuring range. 0.05µg/g or more cadmium.

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

Samples with hydrochloric acid - nitric acid - hydrofluoric acid decomposition, adding a small amount of perchloric acid and heated and evaporated to do to take the white smoke rush hydrofluoric acid, is converted to 2mol/L hydrochloric acid solution, dried 717 anion exchange resin so many interfering elements cadmium and separation. Cadmium is adsorbed on the resin with hot nitric Pickling mention evaporated rush nitric acid and hydrochloric acid - potassium iodide - tetraethyl bromide (iodide) ammonium base solution on the oscilloscope pole spectrometer, the peak potential of about -0.70V (Saturated calomel electrode), adsorption and catalytic current high cadmium concentration peak linear relationship to calculate the amount of cadmium.

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 hydrochloric acid (rho1.19g/mL), pure class distinctions.

4.2 hydrochloric acid (11), pure class distinctions.

4.3 hydrochloric acid (37), pure class distinctions.

4.4 hydrochloric acid c (HCl) = 2mol/L. Take 100mL of hydrochloric acid (4.1) placed in 600mL beaker, add 500mL water, stir well.

4.5 nitrate (rho1.42g/mL), pure class distinctions.

4.6 nitric acid (19).

4.7 Hydrofluoric acid (rho1.15g/mL). Warning --- toxic and corrosive hydrofluoric acid, the operation should wear gloves to prevent skin contact.

4.8 perchloric acid (rho1.67g/mL), pure class distinctions. Warning --- explosive materials, careful.

4.9 tetraethylammonium bromide (iodide) ammonium solution (10g/L).

4.10 potassium iodide solution c (KI) = 1mol/L. Weigh 16.6g of potassium iodide, placed in 150mL beaker, add water to dissolve, moved 100mL volumetric flask, dilute to the mark with water, stir well.

4.11 ascorbic acid solution (100g/L). The time is now equipped with.