GB/T 8151.12-2012Methods for chemical analysis of zinc concentrates - Part 12: Determination of sliver content - The flame atomic absorption spectrometric method (English PDF)

1 Scope

This section GB/T 8151 provisions of the determination of the amount of silver in the zinc concentrate.

This section applies to the determination of zinc concentrates - Determination of silver content range.. 20g/t ~ 1000g/t.

2 Method summary

Samples with hydrochloric acid, nitric acid dissolved in dilute hydrochloric acid medium, atomic absorption spectrometer at a wavelength of 328.1nm, air - acetylene flame,

Measuring the absorbance of silver.

3 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical reagent and distilled or deionized water or equivalent purity.

4 Instrument

Atomic absorption spectrometer and Silver hollow cathode lamp.

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

--- Characteristic concentration. in the matrix solution consistent with the measurement sample solution is characterized in silver concentration should not exceed 0.06µg/mL;

--- Precision. with the highest concentration of the standard solution absorbance measured 10 times, and the standard deviation shall not exceed 1.50% of the average absorbance;

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

0.50% Average high concentration of the standard solution 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 0.7.

5 Sample