YS/T 990.4-2014Methods for chemical analysis of copper matte. Part 4: Determination of bismuth content. Atomic absorption spectrometry (English PDF)

Foreword

YS/T 990 "Methods for chemical analysis of copper matte" is divided into 18 parts.

--- Part 1. Determination of copper content iodometry;

--- Part 2. Determination of gold and silver atomic absorption spectroscopy and fire assay;

--- Part 3. Determination of sulfur content - Gravimetric method and combustion titration method;

--- Part 4. Determination of the amount of bismuth atomic absorption spectrometry;

--- Part 5. Determination of the amount of fluorine ion selective electrode method;

--- Part 6. Determination of lead content - Atomic absorption spectrometry and Na2EDTA titration;

--- Part 7. Determination of cadmium content - Atomic absorption spectrometry;

--- Part 8. Determination of arsenic content by hydride generation - atomic fluorescence spectrometry, diethyl dithiocarbamate spectrophotometry silver and potassium bromate titration;

--- Part 9. Determination of iron content dichromate method;

--- Part 10. Determination of silicon dioxide content molybdenum blue spectrophotometry and potassium fluosilicate volumetric method;

--- Part 11. Determination of the amount of nickel atom absorption spectrometry;

--- Part 12. Determination of the amount of chromium oxide of aluminum Azure S Spectrophotometry;

--- Part 13. Determination of magnesium oxide content - Atomic absorption spectrometry;

--- Part 14. Determination of the amount of zinc atomic absorption spectrometry and Na2EDTA titration;

--- Part 15. Determination of antimony content - Atomic absorption spectrometry;

--- Part 16. Determination of mercury content - Cold atomic absorption spectrometry;

--- Part 17. Determination of the amount of cobalt atomic absorption spectrometry;

--- Part 18. lead, zinc, nickel, arsenic, bismuth, antimony, calcium, magnesium, cadmium, cobalt content - Inductively coupled plasma atomic emission spectrometry.

This section YS/T Part 4 990.

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

The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.

This section is responsible for drafting unit. Zhongtiaoshan Nonferrous Metals Group Co., Ltd. Daye Nonferrous Metals Group Holdings Limited.

This section is drafted. Hunan Nonferrous Metal Research Institute.

Participated in the drafting of this section. Yanggu Yoshimitsu Copper Co., Ltd., Guangzhou Nonferrous Metal Research Institute, Hangzhou Fuchunjiang Smelting Co., cloud Southern Copper Corp., Baiyin Nonferrous Group Co., Ltd., Tongling Nonferrous Metals Group Holdings Co., Ltd., Beijing Nonferrous Metal RESEARCH General Hospital study.

1 Scope

This section YS/T 990 specifies the method for determination of copper matte bismuth content.

This section applies to the determination of copper in ice bismuth content. Determination of the range of 0.10% to 0.50%.

2 Method summary

Samples with hydrochloric acid, nitric acid, bromine decomposition. Salts dissolved in nitric acid, in dilute nitric acid medium, atomic absorption spectrometer wavelength 223.1nm at using air - acetylene flame measured absorbance of bismuth, according to the standard curve method to calculate the amount of bismuth.

3 Reagents

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

3.1 ammonium fluoride.

3.2 hydrochloric acid (rho = 1.19g/mL).

3.3 nitric acid (rho = 1.42g/mL).

3.4 nitric acid (11).

3.5 bromine.

3.6 bismuth standard stock solution. Weigh 1.0000g bismuth (wBi>=99.99%), placed in 250mL beaker, add 50mL nitrate (3.4), low heat until completely dissolved, boil to remove nitrogen oxides, remove the cooled and transferred to 1000mL volumetric flask, add 50mL of nitric acid supplement (3.3), dilute to the mark and mix. This solution 1mL 1mg containing bismuth.

3.7 bismuth standard solution. Pipette 50.00mL standard bismuth stock solution (3.6) in 100mL volumetric flask, was added 10mL of nitric acid (3.4), with Dilute with water to volume, and mix. This solution 1mL containing 500µg bismuth.

4 Instrument

Atomic absorption spectrometer, with a bismuth hollow cathode lamp.

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

--- Characteristic concentration. the test solution is consistent with the measurement of the solution, the concentration of bismuth features should not exceed 0.20µg/mL.

--- Precision. measuring the absorbance of 11 with the highest concentration of the standard solution, the standard deviation should not exceed 0.3% of the average absorbance;

The absorbance measured 11 times the minimum concentration of the standard solution (not a "zero" standard solution), and the standard deviation should not exceed the maximum concentration 0.5% of the mean absorbance of standard solution.

--- 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 of not less than 0.70.