GB/T 1819.14-2017Methods for chemical analysis of tin concentrates—Part 14: Determination of copper content—Flame atomic absorption spectrometry (English PDF)

Foreword

GB/T 1819 "tin concentrate chemical analysis method" is divided into 21 parts.

--- Part 1. Determination of moisture thermal drying method;

--- Part 2. Determination of tin content potassium iodate titration;

--- Part 3. Determination of iron content cerium sulfate titration method;

--- Part 4. Determination of lead content by flame atomic absorption spectrometry and Na2 EDTA titration;

--- Part 5. Determination of arsenic Arsenic antimony molybdenum blue spectrophotometry and iodometric titration;

--- Part 6. Determination of the amount of antimony; malachite green spectrophotometry and flame atomic absorption spectrometry;

--- Part 7. Determination of bismuth content by flame atomic absorption spectrometry;

--- Part 8. Determination of zinc content by flame atomic absorption spectrometry;

--- Part 9. Determination of tungsten oxide content; thiocyanate spectrophotometry;

--- Part 10. Determination of sulfur content High-frequency induction furnace combustion infrared absorption method and potassium iodate titration;

--- Part 11. Determination of the amount of aluminum oxide chromium azure S spectrophotometry;

--- Part 12. Determination of the amount of silica silicon molybdenum blue spectrophotometry and sodium hydroxide titration;

--- Part 13. Determination of magnesia, calcium oxide content; Flame atomic absorption spectrometry;

--- Part 14. Determination of copper content by flame atomic absorption spectrometry;

--- Part 15. Determination of fluorine content ion selective electrode method;

--- Part 16. Determination of silver content; Flame atomic absorption spectrometry;

--- Part 17. Determination of mercury content; atomic fluorescence spectrometry;

--- Part 18. Determination of nickel content by flame atomic absorption spectrometry;

--- Part 19. Determination of cobalt content; Flame atomic absorption spectrometry;

--- Part 20. Determination of cadmium content by flame atomic absorption spectrometry;

--- Part 21. Determination of calcium, magnesium, copper, lead, zinc, arsenic, antimony, bismuth, silver content Inductively coupled plasma atomic emission spectrometry.

This section GB/T 1819 Part 14.

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

This Part replaces GB/T 1819.14-2006 "Determination of copper content of tin concentrate - Determination of copper content flame atomic absorption spectrometry", the Part and GB/T 1819.14-2006 compared to the following major changes.

--- Modify the precision part;

--- Increase the test report terms.

1 Scope

GB/T 1819 provisions of this part of the determination of the amount of copper in tin concentrate.

This section applies to the determination of copper concentrate tin concentrate. Determination of the range of 0.005% ~ 2.00%.

2 Method summary

Samples of hydrochloric acid, nitric acid decomposition, in dilute hydrochloric acid medium, the use of air - acetylene flame atomic absorption spectrometer at a wavelength of 324.7nm, the absorbance of copper is measured.

3 Reagent

Unless otherwise specified, only reagents that are identified as analytically pure and secondary water are used in the analysis.

3.1 Hydrochloric acid (rho = 1.19 g/mL).

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

3.3 Hydrochloric acid (1+1).

3.4 Nitric acid (1+1).

4 Instruments

Atomic absorption spectrometer with copper hollow cathode lamp.

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

--- Characteristic concentration In the solution in accordance with the matrix of the measuring solution, the characteristic concentration of copper should not exceed 0.03µg/mL.

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

--- Work curve linearity. The standard curve is divided into five equal concentrations, the highest segment of the absorbance difference and the lowest segment of the absorbance difference ratio should not be less than 0.70.

5 Sample

Sample size should not be greater than 0.074mm.