Minimizing Matrix Interferences in the Analytical Determination of Gold

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• 作者：N. Baharun ; ^{srnorlia@usm.my" class="auth_mail" title="E-mail the corresponding author} ; P.L. Ong ; C.M. Chan
• 关键词：Fe (III) precipitation ; Low grade gold ores ; High grade gold ores ; Matrix interference ; Solvent extraction ; Standard addition
• 刊名：Procedia Chemistry
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：19
• 期：Complete
• 页码：709-714
• 全文大小：337 K

文摘

In the effort to minimize the interference in gold analysis, standard addition, solvent extraction and Fe (III) precipitation were conducted for samples digested with aqua regia at approximately 80 °C. Standard addition was unsuitable to be used to obtain the accurate concentration for gold because the solution was depressed by the matrix in the aliquot sample. Solvent extraction and Fe (III) precipitation with addition of NH₃ assisted in minimizing the interference by eliminating Fe and other gangue minerals. Before solvent extraction and Fe (III) precipitation, the FAAS gold analysis result for HG sample was 3.18 g/t and gold was not detected for LG sample. After solvent extraction and Fe (III) precipitation, the gold readings for HG sample were enhanced to 3.88 g/t and 3.90 g/t respectively. Whereas, the gold in LG sample were detected with 0.54 g/t and 0.65 g/t by using solvent extraction and Fe (III) precipitation correspondingly. Fe (III) precipitation was found to be the suitable method in minimizing the interference from gangue minerals which suppressed the gold reading.