GB/T 8151.11-2012Methods for chemical analysis of zinc concentrates - Part 11: Determination of antimony content - Hydride generation-atomic fluorescence spectrometry (English PDF)

1 Scope

This section GB/T 8151 provisions of the determination of antimony content in zinc concentrates.

This section applies to the determination of zinc concentrates Determination of antimony content range. 0.0050% to 0.20%.

2 Method summary

The sample is dissolved in nitric acid, tartaric acid in 10% hydrochloric acid medium with thiourea - ascorbic acid solution to the pre-reduced to trivalent antimony in the hydrogenation

Substance generator, is reduced antimony potassium borohydride hydride generation, with argon gas introduced into the quartz furnace atomizer, the measurement on atomic fluorescence spectrometer

The fluorescence intensity.

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 fluorescence spectrometer, with antimony special high-strength hollow cathode lamp.

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

--- The detection limit. not more than 2ng/mL;

--- Precision. The curve of the highest concentration of the standard fluorescence intensity and the "zero" concentration of the solution fluorescence intensity with respect to the highest concentration standard

The coefficient of variation of the average fluorescence intensity of standard solution, should not exceed 5.0% and 1.0%, respectively;