GB/T 3253.5-2008Methods for chemical analysis of antimony and antimony trioxide - Determination of copper content - Flame atomic absorption spectrometric method (English PDF)

1 Scope

This section provides antimony trioxide and determination of copper content.

This section applies to the determination of antimony trioxide and copper content. Measurement range. 0.0002% to 0.30%.

2 Method summary

Sample with nitric acid or hydrochloric acid and hydrobromic acid dissolved and evaporated to dryness, repeat adding hydrobromide volatile except antimony. In dilute hydrochloric acid medium, using air - B

Alkyne flame atomic absorption spectrometer the absorbance at a wavelength of 324.7nm measured at copper, antimony trioxide and other impurities do not interfere

Determination.

3 Reagents

4 Instrument

Atomic absorption spectrometer, with copper 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 features copper concentration should not exceed 0.10µg/mL.

--- Precision. standard solution with the highest concentration of 10 times the absorbance measurements, the standard deviation should not exceed the average absorbance of 1.0%;

With 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

0.5% concentration of the standard average absorbance.

--- 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 0.8.

Atomic absorption spectrometer reference operating conditions.

--- Wavelength 324.7nm;