YS/T 575.11-2007Methods for chemical analysis of bauxite. Part 11: Determination of chromium oxide content. Flame atomic absorption spectrophotometric method (English PDF)

Foreword

YS/T 575-2007 "chemical analysis of bauxite -" Is the YS/T 575-2006 (formerly GB/T 3257-1999) amendments A total of 24 parts.

--- Part 1. aluminum oxide content - EDTA titration

--- Part 2. silica content - Gravimetric - molybdenum blue spectrophotometry

--- Part 3. Determination of silica content molybdenum blue photometric

--- Part 4. iron oxide content - Potassium dichromate titration

--- Part 5. Determination of iron oxide content phenanthroline spectrophotometry

--- Part 6. Determination of titanium dioxide content di Zhao DAM spectrophotometry

--- Part 7. calcium oxide content - Flame Atomic Absorption Spectrometry

--- Part 8. magnesium oxide content - Flame Atomic Absorption Spectrometry

--- Part 9. potassium hydroxide, sodium oxide content - Flame Atomic Absorption Spectrometry

--- Part 10. Determination of manganese oxide content by flame atomic absorption spectrometry

--- Part 11. chromium oxide content - Flame Atomic Absorption Spectrometry

--- Part 12. Determination of vanadium pentoxide content of benzoyl phenylhydroxylamine photometric method

--- Part 13. Determination of zinc content by flame atomic absorption spectrometry

--- Part 14. Determination of total rare earth oxide Tribromoarsenazo spectrophotometry

--- Part 15. Determination of gallium oxide content of rhodamine B extraction spectrophotometry

--- Part 16. Determination of phosphorus pentoxide molybdenum blue photometric

--- Part 17. Determination of sulfur content - Combustion - iodometric method

--- Part 18. Determination of total carbon content - Combustion - non-aqueous titration

--- Part 19. Determination of burning weight reduction method

--- Part 20. pre-dried sample preparation

--- Part 21. Determination of organic carbon titration

--- Part 22. Analysis of samples moisture intrudes content - Gravimetric method

--- Part 23. Determination of the chemical composition of the X-ray fluorescence spectrometry

--- Part 24. Determination of carbon and sulfur content infrared absorption method this is Part 11.

The partial replacement of YS/T 575.11-2006 (formerly GB/T 3257.11-1999).

This section is amended to YS/T 575.11-2006, compared with YS/T 575.11-2006, the main changes are as follows.

--- The drying temperature of the sample unified 110 °C ± 5 °C;

--- Increased precision.

The non-ferrous metal part by the National Standardization Technical Committee and centralized.

This part of the Aluminum Corporation of China Zhengzhou Research Institute is responsible for drafting.

This section drafted by the Aluminum Corporation of China Guizhou Branch.

1 Scope

This section specifies the determination method in bauxite chromium oxide content.

This section applies to the determination of bauxite chromium oxide content measurement range. 0.005% to 0.200%.

2 Principle of the method

Sample melted with sodium hydroxide and sodium peroxide decomposition in sulfuric acid and a small amount of potassium permanganate, an anion exchange resin points from interfering elements such as aluminum, followed by reduction of ascorbic acid eluent and the elution of trivalent chromium in the air - acetylene flame at three wavelength 357.9nm Determination of chromium oxide.

3 Reagents

3.1 sodium hydroxide.

3.2 sodium peroxide.

3.3 hydrochloric acid (0.5mol/L).

3.4 sulfuric acid (1 + 1). adding potassium permanganate solution (3.7) to pink.

3.5 Sodium hydroxide solution [1mol/L].

3.6 osmium sodium.

Weigh 0.5g of osmium tetroxide (spectroscopically pure) was dissolved in 500mL sodium hydroxide solution (3.5) in. An aliquot of the solution was diluted with water dubbed Solution of 0.2g/L of.

3.7 potassium permanganate solution (1g/L).

3.8 potassium permanganate bath. 0.5mL per 100mL of water containing potassium permanganate solution (3.7).

3.9 eluent. 0.5g to 0.5g of ascorbic acid and sodium sulfate dissolved in 100mL of hydrochloric acid (3.3), and the time is now equipped with.

4 Instrument