Determination of Gold in Ores by Isobutyl Methyl Ketone Extraction and Electrothermal Atomic Absorption Spectrometry: A Stability Study of the Metal in Organic Media |
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| Authors: | Maria Inês C Monteiro Marcos Paulo A Lavatori Nilza Maria M de Oliveira |
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| Institution: | Centro de Tecnologia Mineral, CETEM, Coordenação de Química Analítica, Avenida Ipê, n900, Ilha da Cidade Universitária, CEP 21941-590, Rio de Janeiro/RJ, Brazil |
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| Abstract: | A method involving gold extraction into isobutyl methyl ketone (IBMK), after partial dissolution with aqua regia , with determination by electrothermal atomic absorption spectrometry is described. The pyrolysis and atomisation temperatures were optimized using a pyrolytic graphite forked platform. The stability study of gold in isobutyl methyl ketone extract indicated that closed polypropylene containers (3% absorbance measurement changes) were better than both open polypropylene and closed glass containers over periods of up to 22 hr. Satisfactory recoveries of 99 and 102% were obtained when Au, in the IBMK extracts from CH-3 and MA-2 reference materials, were determined after storage of the extracts in closed polypropylene containers for 22 hr, respectively. |
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| Keywords: | spectrométrie d'absorption atomique électrothermale or extraction liquide-liquide isobutyl methyl cetone plateforme double |
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