YS/T 820.15-2012Methods for chemical analysis of laterite nickel ores. Part 15: Determination of cadmium content. Flame atomic absorption spectrometry (English PDF)

Foreword

This section drafted in accordance with GB/T 1.1-2009 given rules.

YS/T 820-2012 "Methods for chemical analysis of nickel laterite ore" is divided into 26 parts.

--- Part 1. Determination of nickel content by flame atomic absorption spectrometry;

--- Part 2. Determination of the amount of nickel dimethylglyoxime spectrophotometry;

--- Part 3. Determination of total iron content of dichromate method;

--- Part 4. Determination of phosphorus content - Molybdenum blue spectrophotometric method;

--- Part 5. Determination of cobalt content by flame atomic absorption spectrometry;

--- Part 6. Determination of copper content - Flame atomic absorption spectrometry;

--- Part 7. Determination of calcium and magnesium content by flame atomic absorption spectrometry;

--- Part 8. Determination of the amount of silica silicon potassium fluoride titration;

--- Part 9. scandium, cadmium determination by inductively coupled plasma - mass spectrometry;

--- Part 10. calcium, cobalt, copper, magnesium, manganese, nickel, zinc and phosphorus content - Inductively Coupled Plasma - Atomic Emission Spectrometry;

--- Part 11. Determination of the amount of fluorine and chlorine ion chromatography;

--- Part 12. Determination of manganese content by flame atomic absorption spectrometry;

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

--- Part 14. Determination of zinc content - Flame atomic absorption spectrometry;

--- Part 15. Determination of cadmium content by flame atomic absorption spectrometry;

--- Part 16. Determination of the amount of carbon and sulfur by high frequency combustion infrared absorption spectroscopy;

--- Part 17. arsenic, antimony, bismuth contents hydride generation - atomic fluorescence spectrometry;

--- Part 18. Determination of mercury content - Cold atomic absorption spectrometry;

--- Part 19. Determination of energy aluminum, chromium, iron, magnesium, manganese, nickel and silicon content dispersive X-ray fluorescence spectrometry;

--- Part 20. Determination of the amount of alumina EDTA titration;

--- Part 21. Determination of chromium content ammonium ferrous sulfate titration;

--- Part 22. Determination of magnesium content EDTA titration;

--- Part 23. cobalt, iron, nickel, phosphorus, aluminum oxide, calcium oxide, chromium oxide, magnesium oxide, manganese oxide, silicon dioxide and titanium dioxide volume Wavelength dispersive X-ray fluorescence spectrometry;

--- Part 24. Determination of hygroscopic water weight method;

--- Part 25. Determination of combined water content - Gravimetric method;

--- Part 26. Determination of loss on ignition - Gravimetric method.

This section YS/T 15820-2012 part of.

This method is a method of arbitration.

This standard by the national non-ferrous metals Standardization Technical Committee (SAC/TC243) centralized.

This standard by the Beijing General Research Institute of Mining and Metallurgy, People's Republic of China Bayuquan Exit Inspection and Quarantine, Jinchuan Group Ltd, Drafted.

This section drafted by. MCC Huludao Nonferrous Metals Group Co., Ltd.

Participated in the drafting of this section. Beijing Mining Research Institute, People's Republic of China Liaoning Entry Inspection and Quarantine Bureau, the People's Republic of China State Bayuquan CIQ.

1 Scope

This section YS/T 820 specifies the method for the determination of cadmium content of nickel laterite ore.

This section applies to the determination of nickel laterite ore cadmium content. Measurement range. 0.0050% to 0.50%.

2 Method summary

Sample decomposition with hydrochloric acid, nitric acid, hydrofluoric acid and perchloric acid. In dilute nitric acid medium, atomic absorption spectrometer at a wavelength of 228.8nm, Using air - acetylene flame measured absorbance cadmium.

3 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical reagent and distilled or deionized water or equivalent purity.

3.1 hydrochloride (rho1.19g/mL).

Nitrate 3.2 (rho1.42g/mL).

3.3 Hydrofluoric acid (rho1.15g/mL).

3.4 perchloric acid (rho1.67g/mL).

3.5 nitric acid (11).

3.6 cadmium standard stock solution. Weigh 1.0000g metal cadmium (wCd>=99.995%) in 250mL beaker, add 20mL of nitric acid (3.5), covered with a watch glass and heated until completely dissolved and cooled to room temperature. Moved into 1000mL volumetric flask, dilute with water to volume, and mix. this 1mL 1mg solution containing cadmium.

3.7 Cadmium standard solution. Pipette 5.00mL cadmium standard stock solution (3.6) in 250mL volumetric flask, was added 25mL of nitric acid (3.5), Dilute with water to volume, and mix. This solution 1mL containing 20µg cadmium.

4 Instrument

Atomic absorption spectrometer, with a cadmium hollow cathode lamp.

Under optimum working conditions for those who can reach the following indicators can be used.

--- Characteristic concentration. In line with the measuring solution matrix solution, characteristic concentration of cadmium should not exceed 0.02µg/mL.

--- Precision. the highest concentration of the standard solution with 10 times the absorbance measured, and the standard deviation should not exceed the average absorbance 1.0%; the lowest concentration of standard solution used (instead of "zero" standard solution) absorbance measured 10 times, and the standard deviation should not exceed the maximum 0.5% high concentration of the standard average absorbance.

--- Linear curve. the curve according to concentration, divided into five sections, the difference between the absorbance of the absorbance difference between the highest and the lowest segment Ratio should not be less than 0.90.