GB/T 4325.10-2013Methods for chemical analysis of molybdenum - Part 10: Determination of copper content - Flame atomic absorption spectrometry (English PDF)

1 Scope

GB/T 4325 provisions of this part of the determination of copper content of molybdenum.

This section applies to molybdenum powder, determination of molybdenum products, molybdenum trioxide and ammonium molybdate copper content. Measurement range. 0.0002% to 0.0100%.

2 Method summary

Sample was dissolved hydrogen peroxide. In nitric acid medium by air - acetylene flame to flame atomic absorption spectrometer at a wavelength of 324.7nm

Measuring the absorbance of copper.

3 Reagents

Unless otherwise indicated, this part of water as a secondary water or water for more than two.

4 Instrument

Atomic absorption spectrometry, Zeeman background correction, with copper hollow cathode lamp.

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

--- Characteristic concentration. the test solution consistent with the determination of the base solution feature copper concentration should be less than 0.016µg/mL;

--- Precision. measure up to 10 times the standard solution, the absorbance of the standard deviation should not exceed the average absorbance of 1.0%; the lowest

Concentration of standard solution (not "zero" concentration of the standard) measuring the absorbance of 10 times, the standard deviation should not exceed the maximum concentration standard

The average standard solution absorbance of 0.66%;

--- 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 segment

Ratio of not less than 0.8.

5 Sample

Molybdenum should smash through the 0.75mm standard sieve.