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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