The Analysis of Nuclear Materials and Their Environments by Claude André Degueldre

Author:Claude André Degueldre
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

3.2.10 Techniques with Lepton Interaction and Ion Detection

3.2.10.1 Electro-Spray Ionization Mass Spectroscopy

Electro-Spray Ionization Mass Spectroscopy (ESIMS). is a recently developed analytical technique that seems promising for speciation studies. This technique applies a spray of electrons on a material surface followed by mass spectrometry of the cluster ions formed in “soft conditions”. First developed for biological samples, it is now used for direct speciation studies in solution. It is now possible to directly couple a liquid at atmospheric pressure to mass detection at reduced pressure, even if the mechanisms taking place are rather complex. ESIMS investigations were adapted for the speciation of Th(IV) hydrolysis species (Moulin et al. 2001) and U(VI) in neutral solutions (Moulin et al. 2000). Figure 3.59 shows a typical spectrum obtained for a uranyl solution at pH 3.5. Peaks can be interpreted for the species [(UO2)i(OH)j(H2O)n](2i−j)+.

Fig. 3.59Electro-spray ionization mass spectrum of uranium at 10 mg l−1 at pH 3.5 and at pH 6.5. Note the presence of species such as a [UO2OH(H2O)n]+ with masses 286.9 + n · 18 at pH 3.5 and b at pH 6.5 where [(UO2)3(OH)5]+ with mass 895.2 is also observed. Moulin et al. (2000) with permission ©Springer

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