GB/T 4372.5-2014Methods for chemical analysis of zinc oxide produced by direct process - Part 5: Determination of manganese content - Flame atomic absorption spectrometry method (English PDF)

1 Scope

GB/T 4372 provisions of this part of the determination of the direct method zinc oxide manganese content.

This section applies to the determination of the direct method zinc oxide manganese content. Determination range of 0.0001% to 0.0010%.

2 Method summary

Sample dissolved in nitric acid, ferric hydroxide as a co-precipitating agent, a large number of trace manganese and zinc substrate separated and enriched, atomic test solution

Absorption spectrometer wavelength 279.5nm measured absorbance in the working curve method for the determination of manganese content.

3 Reagents and materials

Unless otherwise indicated in the analysis using only recognized as analytical reagents; the water is deionized water, the resistivity of not less than 18.2Mohm.

4 Instrument

Atomic absorption spectrometer, with a manganese hollow cathode lamp.

Under optimum working conditions, can be achieved by the following indicators can be used.

Sensitivity. In line with the measurement sample solution matrix solution, characteristic concentration of manganese should not exceed 0.020µg/mL.

Precision. measuring the absorbance at 10 times the highest concentration of the standard solution, the standard deviation should not exceed the average absorbance of 1.0%; most

Low concentrations of the standard solution (not a zero standard solution) absorbance measured 10 times, and the standard deviation should not exceed the mean absorbance of the highest concentration of the standard

0.5% luminosity.

Linear curve. The curve is divided into five sections according to concentration, than the difference between the absorbance of the absorbance difference between the highest and the lowest segment segment,

It should not be less than 0.7.