Abstract
A simple, rapid, selective in situ ionic liquid dispersive liquid–liquid microextraction and determination of Au(III) by flame atomic absorption spectrometry has been first proposed for the extraction of Au(III). In the developed method, NH4PF6 aqueous solution was added to the sample solution containing [CnMIM]Br to form a water-immiscible ionic liquid, [CnMIM]PF6 as extraction solution. The formation of hydrophobic ionic liquid and subsequent extraction of gold(III) were achieved in one step without the need for dispersive solvent and chelating agent. The effects of various experimental parameters on gold extraction were investigated in detail. At optimum conditions, the linear range of 0.9–400 ng/mL of Au(III), the limit of detection 0.13 ng/mL for Au(III) along with enrichment factors of 23.7 and the extraction capacity of 97.5 mg/g by the proposed method for Au(III) were obtained. The proposed method was applied to extract trace amounts of Au(III) in water samples with satisfactory results.
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