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S. Hossein-Zadegan, W. Nischkauer, K. Schröder, A. Limbeck:
"Magnetic nanoparticles coated with ionic liquid for the pre-concentration of Pb in drinking water and the subsequent quantification by FI-ICP-OES";
Poster: 2017 Euopean Winter Conference on Plasma Spectrochemistry, Sankt Anton, Arlberg; 02-19-2017 - 02-24-2017; in: "Book of Abstracts", (2017), 300.

There is no doubt on toxicity of lead and its harmful effects on human health. Besides, widespread use of Pb by industry has led to enormous exposure of environment including water, soil and air. Accordingly, careful control of Pb level in environment is necessary. Inductively coupled plasma optical emission spectrometry (ICP-OES) is a technique frequently applied for the analysis of environmental samples. However, the use of ICP-OES for the determination of Pb is hampered by the poor sensitivity for this element. Thus, assessment of naturally occurring lead levels in environmental samples is impossible without a preliminary pre-concentration step.
In this contribution an innovative procedure for the analysis of Pb in aqueous sample solutions is presented. The approach is based on the enrichment of Pb using the concept of dispersed particle extraction (DPE), followed by automated separation and slurry ICP-OES analysis of the analyte containing sorbent particles using a flow-injection procedure. Silica coated magnetic Co-nanoparticles covered with a layer of ionic liquid (IL) which acts as cation exchanger (Co2O3@SiO2@[P66614][BEHPA]) were used as sorbent material. For sample analysis the magnetic particles were suspended in the sample solution. After analyte adsorption the suspension is directed through a magnetic trap; thereby, the analyte containing magnetic nanoparticles are retained and efficiently separated from the sample solution. After a washing step, the magnetic field of the trap is switched off, and the released particles are transported towards the ICP-OES using a carrier solution. To improve reproducibility and sensitivity of analysis sample enrichment and measurement have been performed using a Flow-Injection procedure which has been coupled online to the detection system. In an application example, the proposed FI-ICP-OES procedure has been successfully used for the quantification of lead in drinking water.

disperse particle extraction, magnetic nanoparticles, flow-injection, ICP-OES