caa a22 4500 37892706X CHVBK 20180305123620.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.711.55004 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.711.55004 Scanning transmission X-ray microscopy as a speciation tool for natural organic molecules [Elektronische Daten] [Jörg Rothe, Markus Plaschke, Melissa A. Denecke] A molecular-scale understanding of the basic processes affecting stability and transport behavior of actinide cations, complexes or hydroxide (‘eigencolloid') species is prerequisite to performance assessment of nuclear waste disposal in geological formations. Depending on their functional group chemistry and macromolecular structure, naturally occurring organic molecules (NOM) possess a high tendency towards actinide complexation reactions. However, the compositional and structural heterogeneity of NOM and mixed aggregates with inorganic phases makes speciation by spectromicroscopy techniques highly desirable. The applicability of Scanning Transmission X-ray Microscopy (STXM) as a speciation tool for the characterization of NOM is demonstrated for a multifunctional natural organic acid (chlorogenic acid), Eu(III)-loaded humic acid (HA) aggregates and Eu(III)-oxo/hydroxide/HA hetero-aggregates. It is shown that in situ probing of HA functional group chemistry down to a spatial resolution <100nm (i.e., less than femto-liter sampled volumes) is feasible, at the same time revealing morphological details on NOM aggregates and NOM/mineral associations. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Rothe Jörg aut Plaschke Markus aut Denecke Melissa A. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 711-715 0033-8230 92:9-11/2004<711 2004 92 ract https://doi.org/10.1524/ract.92.9.711.55004 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.711.55004 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rothe Jörg aut NATIONALLICENCE 700 1- Plaschke Markus aut NATIONALLICENCE 700 1- Denecke Melissa A. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 711-715 0033-8230 92:9-11/2004<711 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter