YS/T 281.7-2011Methods for chemical analysis of cobalt. Part 7: Determination of zinc content. Flame atomic absorption spectrometry (English PDF)

Foreword

YS/T 281-2011 "cobalt chemical analysis method" is divided into the following 20 sections.

--- Part 1. Determination of iron content sulfonic acid spectrophotometry

--- Part 2. Determination of the amount of chrome aluminum Azure S Spectrophotometry

--- 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 spectrometry

--- Part 7. Determination of zinc content - Flame atomic absorption spectrometry

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

--- Part 9. Determination of lead content - flame atomic absorption spectrometry

--- Part 10. Determination of nickel content by flame atomic absorption spectrometry

--- Part 11. Flame atomic copper, manganese content absorption spectrometry

--- Part 12. arsenic, antimony, bismuth, tin, lead and determining the amount of electrothermal atomic absorption spectrometry

--- Part 13. Determination of sulfur content high frequency induction furnace combustion infrared absorption method

--- Part 14. Determination of the amount of carbon high-frequency induction furnace combustion infrared absorption method

--- Part 15. arsenic, antimony, bismuth contents - Hydride Generation - Atomic Fluorescence Spectrometry

--- Part 16. Determination of DC arc atomic arsenic, cadmium, copper, zinc, lead, bismuth, tin, antimony, silicon, manganese, iron, nickel, aluminum, magnesium content of the emitted light Spectroscopy

--- Part 17. aluminum, manganese, nickel, copper, zinc, cadmium, tin, antimony, lead, bismuth content - Inductively Coupled Plasma Mass Spectrometry

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

--- Part 19. calcium, magnesium, manganese, iron, cadmium, zinc content - Inductively coupled plasma atomic emission spectrometry

--- Part 20. Determination of oxygen content - Impulse - infrared absorption method this section YS/T 281 Part 7.

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

The partial replacement of YS/T 281.7-1994 "cobalt chemical analysis by flame atomic absorption spectrometry determination of zinc content." versus YS/T 281.7-1994 compared, this section there are major changes as follows.

--- Text format has been modified, supplemented with quality assurance and control provisions, increase the repeatability limit and reproducibility limit;

--- Complement the test reporting requirements.

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

1 Scope

This section YS/T 281 provides for the determination of cobalt in zinc content.

This section applies to the determination of zinc content in cobalt. Measurement range. 0.00080% to 0.0080%.

2 Method summary

Sample decomposition with nitric acid, in dilute nitric acid medium, using air - acetylene flame atomic absorption spectrometer at a wavelength of 213.9nm measured Zinc absorbance. In the standard solution and sample solution should contain the same concentration of cobalt matrix.

3 Reagents

Unless otherwise specified, the reagents were analytical reagent solution preparation and analysis are secondary distilled water or equivalent purity test Room with water.

4 Instrument

Atomic absorption spectrometer, with zinc hollow cathode lamp.

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

--- Characteristic concentration. in the measurement sample solution matrix consistent solution, characterized in zinc concentration should be less than 0.005µg/mL.

--- Linear curve. The curve is divided into five sections according to concentration, absorbance difference between the absorbance difference between the highest and the lowest segment of the segment Ratio of not less than 0.85.

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