Heidelberg 2015 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 5: Resonance Ionization

MS 5.5: Vortrag

Dienstag, 24. März 2015, 15:45–16:00, PH/HS2

Characterization of mixed Mo-Zr solution species by nano-Electrospray Ionization Mass Spectrometry — •Meijie Cheng^1,2, Michael Steppert¹, and Clemens Walther¹ — ¹Institut für Radioökologie und Strahlenschutz, Leibniz Universität Hannover, Herrenhäuser Str. 2, D-30419 Hannover. — ²Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung (INE), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen

Nano-electrospray ionization mass spectrometry is a useful tool to characterize not only stoichiometry of solution species, but also redox state. This technique is able to transfer charged species present in solution into the vacuum under soft conditions that keep the molecules intact during the whole measurement process. Mass spectrometric methods find increasingly more applications within questions arising from the nuclear fuel cycle. Both Molybdenum and Zirconium are present in spent fuel in significant amounts as high yield fission products. These two elements tend to form poorly soluble solid phases, which can disturb reprocessing steps of spent fuel as well as the immobilization of radionuclides in matrices for final disposal. By applying ESI MS to solutions of Mo and Zr at high acidic strengths we were able to detect mixed Mo-Zr precursors to the precipitates in solution and probe their abundance depending on acidic strength.