GB/T 8151.8-2012Methods for chemical analysis of zinc concentrates - Part 8: Determination of cadmium content - The flame atomic absorption spectrometric method (English PDF)

1 Scope

This section GB/T 8151 provisions of the determination of the amount of cadmium zinc concentrates.

This section applies to the determination of the amount of cadmium in zinc concentrate measurement range. 0.10% to 2.00%.

2 Method summary

Samples with hydrochloric acid, nitric acid dissolved in dilute nitric acid medium, atomic absorption spectrometer at a wavelength of 228.8nm, air - acetylene flame,

Measuring the absorbance of cadmium.

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, with a cadmium hollow cathode lamp.

Under instrument conditions, who can achieve the following indicators atomic absorption spectrometer can be used.

--- Characteristic concentration. in the sample solution matrix consistent solution, characteristic concentration of cadmium should not exceed 0.03µg/mL;

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

1.50%; absorbance measured 10 times the minimum concentration of the standard solution (not a "zero" standard solution), and the standard deviation should not exceed

0.50% the highest 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 0.90.

5 Sample