YS/T 990.7-2014Methods for chemical analysis of copper matte. Prat 7: Determination of cadmium 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 spectrophotometric method and silicon potassium fluoride titration;

--- 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 Section 7990 of.

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.

1 Scope

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

This section applies to the determination of copper in ice cadmium content. Determination range of 0.010% to 0.50%.

2 Method summary

Samples with hydrochloric acid, nitric acid, ammonium bromide and hydrogen fluoride decomposition in dilute nitric acid medium, using air - acetylene flame atomic absorption spectrophotometry Total measured at a wavelength of 228.8nm cadmium absorbance, calculate the amount of cadmium.

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 hydrochloric acid (rho = 1.19g/mL).

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

3.3 nitric acid (11).

3.4 nitric acid (595).

3.5 bromine.

3.6 perchloric acid (rho = 1.67g/mL).

3.7 Ammonium hydrogen fluoride (saturated solution).

3.8 cadmium standard stock solution. Weigh 1.0000g metal cadmium (wCd>=99.99%), placed in 250mL beaker, add 10mL of nitric acid (3.2), low-temperature heating until complete dissolution, micro-boiling removing nitrogen oxides, cooled and transferred to 1000mL volumetric flask, dilute to the mark with water, mix Uniform, stored in a plastic bottle containing 1mg solution 1mL cadmium.

3.9 Cadmium Standard Solution A. Pipette 10mL cadmium standard stock solution (3.8) in 100mL volumetric flask, was added 10mL of nitric acid (3.3), with Dilute with water to volume, and mix. This solution 1mL containing 100µg cadmium.

3.10 Cadmium standard solution B. Pipette 10mL cadmium standard solution A (3.9) in 100mL volumetric flask, 10mL of nitric acid was added (3.3) Water Dilute to volume, and mix. This solution 1mL containing 10µg cadmium.

4 Instruments and equipment

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. a solution in the measurement matrix consistent solution, characteristic concentration of cadmium should not exceed 0.02µg/mL.

--- Precision. standard solution with the highest concentration of 11 times the absorbance measurements, the standard deviation should not exceed the average absorbance of 1.0%;

The lowest concentration of standard solution used (instead of "zero" concentration of the standard solution) 11 measuring the absorbance, which should not exceed the standard deviation