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S. Hossein-Zadegan, W. Nischkauer, K. Schröder, A. Limbeck:
"Dispersed Particle Extraction using ionic liquid-coated magnetic nanoparticles in combination with a FI-ICP-OES procedure for sensitive analysis of REE";
Poster: Euroanalysis XVIII, Bordeaux, France; 09-06-2015 - 09-10-2015; in: "Book of Abstracts", (2015), 1 pages.

Discrimination of rare earth elements (REE) is a useful tool in geochemical fingerprinting and health related studies. For this task, inductively coupled plasma optical emission spectrometry (ICP-OES) is widely used, but due to naturally low occurrence of REEs; their enrichment prior to analysis is mandatory. For this purpose, several enrichment methods have been reported in literature, in which solid phase extraction (SPE) is the most feasible one. Nevertheless, some disadvantages of SPE gives reason to apply an improved extraction process named dispersed particle extraction (DPE), whereby self-made functionalized silica particles adsorb the analyte ions. For analysis the analyte containing particles were injected into the plasma without any prior elution, resulting in higher recoveries and better reproducibility.
In the present work, Co2O3@SiO2@[P66614][BEHPA] is used for first time as an adsorbent which consists of silica coated magnetic nanoparticles covered by an ionic liquid (IL) which acts as an ion exchanger. For sample analysis the magnetic particles were suspended in the sample solution, after adsorption of the REE the suspension is directed through a magnetic trap, thereby the particles were retained and efficiently separated from the sample solution. After a wash step the magnetic field of the trap is switched off, and the released particles were transported with a carrier solution into the ICP-OES. To improve reproducibility and sensitivity of analysis sample enrichment and measurement has been performed using a Flow-Injection procedure which has been coupled online to the detection system.

ETV-ICP-OES, REE analysis, dispersed particle extraction, ionic liquids