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Talks and Poster Presentations (with Proceedings-Entry):

S. Hossein-Zadegan, W. Nischkauer, K. Schröder, A. Limbeck:
"ETV-ICP-OES measurement of rare earth elements retained on natural bio-particles covered with ionic liquid";
Talk: Euroanalysis XVIII, Bordeaux, France; 09-06-2015 - 09-10-2015; in: "Book of Abstracts", (2015), 1 pages.



English abstract:
Rare earth element (REE) impurities in phosphate fertilizers, used in agriculture, have low to moderate toxicity. Despite REEs positive effects on plant growth, REEs in soil might enter the human food-chain. To analyze multi elements, inductively coupled plasma optical emission spectrometry (ICP-OES) is used. However, determination of REEs by ICP-OES needs enrichment prior to analysis due to their low concentration in fertilizers.
In this work, an innovative approach is presented, which is based on preliminary enrichment of REE using dispersed particle extraction (DPE), followed by sensitive measurement by means of electro thermal vaporization (ETV) coupled to ICP-OES. In DPE, adsorbent particles are dispersed in the sample solution, after a reaction time of few minutes the supernatant is separated from the analyte containing sorbent particles. The applied adsorbent is a natural bio particle, Lycopodium clavatum spore, with the size of 30 ± 4 μm (from SEM images) and high porosity which was covered by an ionic liquid salt [P66614][BEHPA] as the ion exchanger. For element specific analysis, the precipitated particles are transferred into a graphite boat and measured using ETV-ICP-OES, which allows an efficient separation of the organic sorbent matrix and thus an interference free measurement of REE. Using the inexpensive nature-made particles with easily tunabled ionic liquid for analyte enrichment in combination with ETV-ICP-OES analysis has been found to provide sufficient sensitivity but also high reproducibility.

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

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