@misc{SchottKretzschmarAckeretal.2014,
  author    = {Schott, Juliane and Kretzschmar, Jerome and Acker, Margret and Eidner, Sascha and Kumke, Michael Uwe and Drobot, Bj{\"o}rn and Barkleit, Astrid and Taut, Steffen and Brendler, Vinzenz and Stumpf, Thorsten},
  title     = {Formation of a Eu(III) borate solid species from a weak Eu(III) borate complex in aqueous solution},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-98774},
  pages     = {13},
  year      = {2014},
  abstract  = {In the presence of polyborates (detected by 11B-NMR) the formation of a weak Eu(III) borate complex (lg β11 ∼ 2, estimated) was observed by time-resolved laser-induced fluorescence spectroscopy (TRLFS). This complex is a precursor for the formation of a solid Eu(III) borate species. The formation of this solid in solution was investigated by TRLFS as a function of the total boron concentration: the lower the total boron concentration, the slower is the solid formation. The solid Eu(III) borate was characterized by IR spectroscopy, powder XRD and solid-state TRLFS. The determination of the europium to boron ratio portends the existence of pentaborate units in the amorphous solid.},
  language  = {en}
}
@misc{DettmannHuittinenJahnetal.2023,
  author    = {Dettmann, Sophie and Huittinen, Nina Maria and Jahn, Nicolas and Kretzschmar, Jerome and Kumke, Michael and Kutyma, Tamara and Lohmann, Janik and Reich, Tobias and Schmeide, Katja and Azzam, Salim Shams Aldin and Spittler, Leon and Stietz, Janina},
  title     = {Influence of gluconate on the retention of Eu(III), Am(III), Th(IV), Pu(IV), and U(VI) by C-S-H (C/S = 0.8)},
  series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  number    = {1318},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-58845},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-588455},
  pages     = {15},
  year      = {2023},
  abstract  = {The retention of actinides in different oxidation states (An(X), X = III, IV, VI) by a calcium-silicate-hydrate (C-S-H) phase with a Ca/Si (C/S) ratio of 0.8 was investigated in the presence of gluconate (GLU). The actinides considered were Am(III), Th(IV), Pu(IV), and U(VI). Eu(III) was investigated as chemical analogue for Am(III) and Cm(III). In addition to the ternary systems An(X)/GLU/C-S-H, also binary systems An(X)/C-S-H, GLU/C-S-H, and An(X)/GLU were studied. Complementary analytical techniques were applied to address the different specific aspects of the binary and ternary systems. Time-resolved laser-induced luminescence spectroscopy (TRLFS) was applied in combination with parallel factor analysis (PARAFAC) to identify retained species and to monitor species-selective sorption kinetics. ¹³C and ²⁹Si magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy and X-ray photoelectron spectroscopy (XPS) were applied to determine the bulk structure and the composition of the C-S-H surface, respectively, in the absence and presence of GLU. The interaction of Th(IV) with GLU in different electrolytes was studied by capillary electrophoresis-inductively coupled plasma mass spectrometry (CE-ICP-MS). The influence of GLU on An(X) retention was investigated for a large concentration range up to 10⁻² M. The results showed that GLU had little to no effect on the overall An(X) retention by C-S-H with C/S of 0.8, regardless of the oxidation state of the actinides. For Eu(III), the TRLFS investigations additionally implied the formation of a Eu(III)-bearing precipitate with dissolved constituents of the C-S-H phase, which becomes structurally altered by the presence of GLU. For U(VI) sorption on the C-S-H phase, only a small influence of GLU could be established in the luminescence spectroscopic investigations, and no precipitation of U(VI)-containing secondary phases could be identified.},
  language  = {en}
}