Vibrational spectroscopic study of Np(V) sorption on mineral oxides


Vibrational spectroscopic study of Np(V) sorption on mineral oxides

Müller, K.; Berger, J.; Cordiez, M.; Gröschel, A.; Foerstendorf, H.

Mineral oxides play a decisive role in regulating the mobility of contaminants in the environment because of their widespread occurrence in rocks and soils, their tendency to form coatings on mineral surfaces and their wide-ranging technical applications [1].
Due to its long half-life and its toxicity, Np-237 is considered as a major contaminant of the ecosystem in the long-term safety assesment of nuclear waste repositories. The pentavalent state is environmentally most relevant [2].
For the first time, in-situ Np(V) sorption is comparatively studied on the oxyhydroxides of Fe, Mn, Si and Ti by ATR FT-IR spectroscopy under a variety of environmentally relevant sorption conditions. From the results, the formation of binary inner-sphere complexes on oxides of Si, Mn, Fe and Ti can be derived [3]. In case of ferrihydrite, the formation of an additional ternary Np-carbonato surface species is assumed. In addition, time resolved spectra provide kinetic information on the surface reactions.
[1] Dixon J. B. et al.(1989) Minerals in soil environments. Madison, Wisc.: Soil Science Soc. of America. 1244. [2] Kaszuba J. P. et al. (1999) Env. Sci. & Techn. 33(24), 4427-4433. [3] Müller K. et al. (2009) Env. Sci. & Techn. 43(20): p. 7665-7670

  • Lecture (Conference)
    Goldschmidt 2013, 25.-30.08.2013, Florence, Italy
  • Abstract in refereed journal
    Mineralogical Magazine 77(2013)5, 1806

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Publ.-Id: 18642