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F. Horak, C. Koch, B. Lendl, A. Limbeck:
"On-line fractionation of aqueous samples using acoustic standing wave particle manipulation with ICP-OES";
Poster: 2017 Euopean Winter Conference on Plasma Spectrochemistry, Sankt Anton, Arlberg; 02-19-2017 - 02-24-2017; in: "Book of Abstracts", (2017), 261.

ICP-OES is a well established method for identification and quantification of elements in solid and aqueous samples. However, without using it in combination with a hyphenated separation technique it is lacking information about the chemical nature of the element in the sample.
In this work we present a newly developed method enabeling online fractionation of aqueous samples with a disperse particle extraction (DPE) approach. Commercially available, as well as self-synthesized surface modified particles have been applied on aqueous samples in order to separate the organic-complexed fractions from the free ionic fraction of selected analytes. The surface modified particles are added to the sample and thoroughly mixed. The suspension is then introduced to the fractionation system, where the particles are separated from the sample and the fraction of the sample which did not bind to the particles passes directly to the ICP-OES. Acoustic standing waves are used to excert a trapping force on the patricles within a commercial flow-through-cell, thus serparating them from the sample suspension and releasing them after it has passed the cell. The implementation of this separation cell removes the centrifugation step from the conventional DPE method, therefore making it automatable and suitable for on-line applications.

disperse particle extraction, particle trap, ultrasonic standing waves, ICP-OES