caa a22 4500 378927175 CHVBK 20180305123620.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.617.55007 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.617.55007 The redox behaviour of plutonium in humic rich groundwater [Elektronische Daten] [Christian M. Marquardt, A. Seibert, Robert Artinger, Melissa A. Denecke, B. Kuczewski, D. Schild, Thomas Fanghänel] Experiments with different oxidation states of Pu in GoHy-532 groundwater under reducing conditions reveal that Pu(VI) and Pu(V) are reduced rapidly to Pu(IV) at pH 7. The half-life of the redox reactions Pu(VI)/(V) and Pu(V)/(IV) are in the range of minutes. The rates of both reduction reactions decrease with decreasing pH values. A portion of the Pu(IV) is not stable in the same groundwater and is reduced slowly to Pu(III) in the range of weeks. Ultrafiltration experiments show Pu to be totally bound to the humic substances in the groundwater. At Pu concentrations of 10-5 to 10-4M, most of the Pu occurs as a Pu-colloid and/or Pu-colloid bound to humic substances (Pu-colloid-HS) in solution, which is indicated by EXAFS/XANES and XPS measurements. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Marquardt Christian M. aut Seibert A. aut Artinger Robert aut Denecke Melissa A. aut Kuczewski B. aut Schild D. aut Fanghänel Thomas aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 617-623 0033-8230 92:9-11/2004<617 2004 92 ract https://doi.org/10.1524/ract.92.9.617.55007 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.617.55007 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Marquardt Christian M. aut NATIONALLICENCE 700 1- Seibert A. aut NATIONALLICENCE 700 1- Artinger Robert aut NATIONALLICENCE 700 1- Denecke Melissa A. aut NATIONALLICENCE 700 1- Kuczewski B. aut NATIONALLICENCE 700 1- Schild D. aut NATIONALLICENCE 700 1- Fanghänel Thomas 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), 617-623 0033-8230 92:9-11/2004<617 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter