Ultra-Trace Determination of Copper and Silver in Environmental Samples by Using Ionic Liquid-Based Single Drop Microextraction-Electrothermal Atomic Absorption Spectrometry

• Main Authors: J. Abolhasani, M. Amjadi, E. Ghorbani Kalhor
• Format: Article
• Language: English
• Published: Islamic Azad University 2013-11-01
• Series: Journal of Chemical Health Risks
• Subjects: Ionic liquids, Single-drop microextraction, Electrothermal atomic absorption spectrometry, Silver, Copper, Preconcentration
• Online Access: http://jchr.org/index.php/JCHR/article/view/187

A sensitive, selective and effective ionic liquid-based single drop microextraction technique was<br />developed by using ionic liquid, 1-hexyl-3-methylimidazolium hexafluorophosphate, C6MIMPF6, coupled<br />with electrothermal atomic absorption spectrometry (ETAAS) for the determination of copper and silver in<br />environmental samples. Dithizone was used as chelating agent. Several factors that influence the<br />microextraction efficiency and ETAAS signal, such as pH, dithizone concentration, extraction time, amounts of<br />ionic liquid, stirring rate, pyrolysis and atomization temperature were investigated and the microextraction<br />conditions were established. In the optimum experimental conditions, the detection limits (3 s) of the method<br />were 4 and 8 ng L-1 and corresponding relative standard deviations (0.1 μg L-1, n = 6) were 4.2% and 4.8% for<br />Ag and Cu, respectively. The developed method was validated by analysis of a certified reference material and<br />applied to the determination of silver and copper.