Preconcentration and determination of palladium water samples by ionic liquid - dispersive liquid liquid microextraction combined with flame atomic absorption spectrometry

Authors

Department of Chemistry, Faculty of Science, Islamic Azad University, Arak branch, Arak, Iran

Abstract

A simple, rapid and efficient dispersive liquid–liquid microextraction by use of ionic liquid (IL-DLLME)
method, followed by flame atomic absorption spectrometry (FAAS) was developed for the preconcentration
and determination of palladium in water samples. In this method, an appropriate mixture of acetone and octyl
methyl imidazolium hexafluorophosphate was injected rapidly into the aqueous sample containing
palladium-DDTC complex, as a result cloudy mixture was formed. After extraction of palladium complex
into fine droplet, the mixture was centrifuged. As a result, fine organic drop was setteled in the bottom of test
tube. After remove of aqueous solution and dilution of organic phase; it was introduced into the flame atomic
absorption by microsampler injector. Several parameters influencing the microextraction efficiency, such as
the nature and volume of organic solvent, pH of aqueous solution, amount of complexing agent, stirring rate
and extraction time were investigated and optimized. The applicability of technique was evaluated by
determination of trace amounts of palladium in several water samples. Under the optimum conditions, the
enhancement factor was 83. The limit of detection, 2.8 μgL−1 and relative standard deviation (RSD) 4.31 %
(n=10) were obtained.

Keywords


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