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Quantitation of trace lanthanide and actinide ions in radioactive samples by capillary electrophoresis-laser-induced fluorescence detection

Haraga, Tomoko   ; Saito, Shingo*

We developed highly sensitive capillary electrophoresis-laser-induced fluorescence detection methods for lanthanide (Ln) and actinide (An) ions with small sample volume and low emission of waste, by which the radiation risk can be minimized. Specifically, determination of Nd ion in spent nuclear fuel, effective separation between Am and Cm ion, and specific detection of UO$$_{2}$$$$^{2+}$$ in real radioactive samples were achieved by molecular design of fluorescence probes composed of an aminocarboxylate chelating moiety, a fluorophore and a spacer, and unique separation mode based on dynamic ternary complexation. We found that there are appropriate combination of probe and ternary complexation for detection and separation of each Ln and An ions. For example, acyclic and macrocyclic hexadentate is suitable for Ln$$^{3+}$$, Am$$^{3+}$$ and Cm$$^{3+}$$, and planer tetradentate with $$pi$$ electron system is specific for UO$$_{2}$$$$^{2+}$$, with ppt-sub ppt level detection.

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