GB/T 3253.9-2009Methods for chemical analysis of antimony and antimony trioxide - Determination of cadmium content - Flame atomic absorption spectrometric method (English PDF)

1 Scope

GB/T 3253 provisions of this part of the determination of antimony and antimony trioxide in the amount of cadmium.

This section applies to the determination of antimony and cadmium antimony trioxide in. Measurement range. 0.0001% to 0.0100%.

2 Method summary

Sample was dissolved in aqua regia (antimony sample was dissolved in hydrobromic acid) with hydrochloric acid - volatile antimony hydrobromic acid, hydrochloric acid residue was dissolved in hydrochloric acid

Absorption spectrometer measured at a wavelength of 228.8nm cadmium in atomic absorbance.

3 Reagents

Unless otherwise indicated, the reagents used in this section refer to water and analytical grade and third grade water.

4 Instrument

Atomic absorption spectrometer, with a cadmium hollow cathode lamp. Under optimum working conditions for those who can reach the following indicators can be used.

--- Sensitivity. substantially consistent with the measurement of the solution, the characteristic concentration of cadmium should not exceed 0.014µg/mL;

--- Precision. measuring absorbance 10 times the highest concentration of the standard, and the standard deviation shall not exceed 1.00% of the average absorbance,

With the lowest concentration (not zero concentration) standard solution absorbance measured 10 times, and the standard deviation should not exceed the maximum concentration of the standard

0.50% average absorbance;

--- Linear curve. the curve was divided into five sections, the difference between the ratio of the absorbance of the absorbance difference between the highest and the lowest segment section shall not

Less than 0.8.

Atomic absorption spectrometer reference operating conditions.

--- Wavelength 228.8nm;

--- Lamp current 2.0mA;

--- Lean combustion flame.