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FU Wen-hui,AI Zhao-chun,GE Yan-mei,LI Ya.Determination of Au in High Grade Gold Deposits by Flame Atomic Absorption Spectrometry[J].Rock and Mineral Analysis,2013,32(3):427-430
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Determination of Au in High Grade Gold Deposits by Flame Atomic Absorption Spectrometry
Received:September 17, 2012  Revised:October 20, 2012
DOI:
Key words: high grade of gold deposit  Au  Flame Atomic Absorption Spectrometry
Author NameAffiliation
FU Wen-hui Heilongjiang Province Geology Ore Test and Application Institute, Harbin 150036, China 
AI Zhao-chun The 2311 Secondary Metrology Station of Science, Technology and Industry for National Defense, Harbin 150046, China 
GE Yan-mei Heilongjiang Province Geology Ore Test and Application Institute, Harbin 150036, China 
LI Ya Heilongjiang Province Geology Ore Test and Application Institute, Harbin 150036, China 
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Abstract:
      The conventional fire assay method to determine high grade gold has a long chemical procedure with many factors influencing the analysis result. Moreover, the ash blowing process for the Pb button volatilizes a large amount of Pb, causing serious pollution to the environment. In this paper, a method is described whereby the 20.0-100.0 g sample was split into small amounts and calcinated. The products of calcination were dissolved by 50% aqua regia and the residues were filtered. All the clean filtrates were loaded into a volumetric flask. An appropriate volume of solution was selected to extract Au with foam enrichment. After ashing the Au bearing foams, the Au was dissolved again by concentrated aqua regia. Then, the Au was measured by Flame Atomic Absorption Spectrometry (FAAS). The detection limit was 0.101 μg/g. Through verifications for a few national first grade standard materials and the analysis samples, the accuracy and precision met the relevant requirements. The sampling weight was from 20.0 g to 100.0 g which effectively improved the sample representativeness and extended the analysis content range for Au by FAAS. This method is also suitable for samples with Au contents from 50.0 μg/g to 550.0 μg/g.