Determination of Gold(III) by Simplified Room-Temperature Ionic Liquid Extraction with Flame Atomic Absorption Spectrometry

Abstract

A new simplified extraction of gold(III) using a room-temperature ionic liquid prior to determination by flame atomic absorption spectrometry has been developed. The extraction method uses 1-butyl-3-methylimidazolium hexafluorophosphate without a chelating agent. The parameters of the extraction system were investigated in detail. Under the optimized conditions, a linear range of 0.19 to 38.20 lg Á mL À1 , a limit of detection of 0.072 lg Á mL À1 , an enrichment factor of 10.0, and an extraction capacity of 6.6 mg Á g À1 were obtained. The extraction mechanism and the selectivity of 1-butyl-3-methylimidazolium hexafluorophosphate for gold(III) were also investigated. The method was applied for the determination of gold(III) in water samples with satisfactory results.

Comparative Study on Two Pretreatment Processes for Chemical Phase Analysis of Gold in Geological Samples by Atomic Absorption Spectrometry

“…At the same time, the test methods will also have a certain impact on the experimental results. Commonly used gold test methods include titration [21], atomic absorption spectrometry (AAS) [20, 22–24], inductively coupled plasma optical emission spectroscopy [25, 26], and inductively coupled plasma mass spectrometry [27, 28]. Among them, the AAS meets the test conditions of most geological samples, and its analytical techniques are relatively mature and widely used [29–32].…”