YS/T 281.6-2011Methods for chemical analysis of cobalt. Part 6: Determination of magnesium content. Flame atomic absorption spectrometry (English PDF)

Foreword

YS/T 281 "cobalt chemical analysis method" is divided into the following 20 parts.

Part 1. Determination of iron content - Sulfosalicylic acid spectrophotometric method Part 2. Determination of aluminum content - Chromazu S spectrophotometric method Part 3. Determination of silicon content - Molybdenum blue spectrophotometric method Part 4. Determination of arsenic content - Molybdenum blue spectrophotometric method - Part 5. Determination of phosphorus content - Molybdenum blue spectrophotometric method Part 6. Determination of magnesium content - Flame atomic absorption spectrometric method - Part 7. Determination of zinc content - Flame atomic absorption spectrometric method Part 8. Determination of cadmium content - Flame atomic absorption spectrometric method Part 9. Determination of lead content - Flame atomic absorption spectrometric method Part 10. Determination of nickel content - Flame atomic absorption spectrometric method - Part 11. Determination of copper and manganese - Flame atomic absorption spectrometric method - Part 12. Determination of arsenic, antimony, bismuth, tin and lead - Electrothermal atomic absorption spectrometry - Part 13. Determination of sulfur content - High frequency induction furnace combustion infrared absorption method - Part 14. Determination of carbon content - High frequency induction furnace combustion infrared absorption method - Part 15. Determination of arsenic, antimony and bismuth - Hydride generation - atomic fluorescence spectrometry - Part 16. Determination of the amount of arsenic, cadmium, copper, zinc, lead, bismuth, tin, antimony, silicon, manganese, iron, nickel, aluminum and magnesium.

Spectrum method

- Part 17. Determination of aluminum, manganese, nickel, copper, zinc, cadmium, tin, antimony, lead and bismuth inductively coupled plasma mass spectrometry - Part 18. Determination of sodium content - Flame atomic absorption spectrometric method - Part 19. Determination of calcium, magnesium, manganese, iron, cadmium and zinc - Inductively coupled plasma emission spectrometric method - Part 20. Determination of the amount of oxygen - Infrared absorption method this section is part 6 of YS/T 281.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces YS/T 281.6-1994 "cobalt chemical analysis method flame atomic absorption spectrometry for the determination of magnesium content". With YS/T 281.6-1994, this section has the following main changes.

--- the determination range from 0.0005% to 0.002% modified to 0.00050% ~ 0.0050%;

--- The text format has been modified to supplement the quality assurance and control terms, increasing the repeatability and reproducibility limits;

- Added the requirements for the test report.

This part of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243) proposed and centralized.

This standard is responsible for drafting units. Jinchuan Group Co., Ltd., Beijing Mining and Metallurgy Research Institute.

This part is responsible for drafting unit. Jinchuan Group Co., Ltd.

This part participates in the drafting unit. Beijing Mining and Metallurgy Research Institute, Jiangsu Kailike Cobalt Industry Co., Ltd., Zhejiang Huayou Cobalt Co., Ltd.

Company, China Metallurgical Huludao Nonferrous Metals Group Co., Ltd.

1 Scope

This part of YS/T 281 specifies the determination of magnesium content in cobalt.

This part is applicable to the determination of magnesium in cobalt. Measuring range. 0.00050% ~ 0.0050%.

2 Method summary

The sample was decomposed with nitric acid and used in a dilute nitric acid medium using an air-acetylene flame at a wavelength of 285.2 nm at the atomic absorption spectrometer.

Magnesium absorbance.

The standard solution should contain the same concentration of cobalt matrix as the sample solution.

3 Reagent

If no special instructions, the reagents used for the analysis of pure reagents, preparation and analysis of water are secondary distilled water or considerable purity of the experiment Room water.

3.1 metal cobalt (wCo >= 99.98%, wMg 99.98, preheated at 900 ° C to constant weight and dried in a desiccator Cooled to room temperature), placed in a 250 mL beaker, carefully add 20 mL of nitric acid (3.2), cover the dish, completely dissolve, slightly boil off nitrogen Remove the water, wash the dish and cup wall, cool to room temperature. Into the 1000mL volumetric flask, diluted with water to the mark, mix. This solution 1mL containing 100µg of magnesium.

3.6 Magnesium standard solution. Remove the 5.00 mL magnesium standard storage solution (3.5) and place in a 100 mL volumetric flask. Diluted with water to the mark, mixed uniform. This solution 1mL containing 5µg of magnesium.

4 Instruments

Atomic Absorption Spectrometer, Magnesium Hollow Cathode Lamp.

In the best working conditions of the instrument, who can achieve the following indicators can be used.

- Characteristic concentration. In the solution consistent with the matrix of the test sample solution, the characteristic concentration of magnesium should not be greater than 0.005µg/mL.

--- working curve linear. the working curve by the concentration of divided into five sections, the highest section of the difference between the absorbance difference and the lowest of the difference in absorbance Ratio should not be less than 0.85.

Precision. the maximum concentration of the standard solution of 10 times the absorbance, the standard deviation should not exceed the average absorbance 1.50%; measured with a minimum concentration of standard solution (not a "zero" concentration standard solution) 10 times the absorbance, the standard deviation should not More than 0.5% of the average absorbance of the highest concentration standard solution.