caa a22 4500 378878387 CHVBK 20180305123426.0 cr unu---uuuuu 161128e20031201xx s 000 0 eng 10.1524/ract.91.12.743.23420 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.12.743.23420 Humic colloid mediated transport of tetravalent actinides and technetium [Elektronische Daten] [Robert Artinger, Gunnar Buckau, P. Zeh, K. Geraedts, J. Vancluysen, A. Maes, Jae-Il Kim] The humic colloid mediated transport of tetravalent actinide and technetium ions is discussed. Numerous published and new results are used from comparable experimental systems and conditions. The results originate from investigations on two humic rich Gorleben groundwater/sediment systems under near-natural conditions. The conditioning time between groundwater and radionuclides vary from few minutes to four years. The migration time (residence time in the column) is varied from four hours to three days. The concentration of radionuclides added is varied between about 10-12 and 10-4mol/L. Humic colloids in natural groundwater contain trace metal ions in varying concentrations. In addition to studying the behavior of radionuclides added to the groundwater in the laboratory, the dissociation behavior of these natural tetravalent trace metal ions is studied by scavenging dissociating ions with a cation exchanger. The results show a kinetic behavior of the trace metal ion interaction as frequently reported in the literature, i.e. with increasing contact time, slow dissociation modes are progressively populated resulting in an enhanced radionuclide transport. The strong dependency of the radionuclide transport on the radionuclide concentration shows that humic colloid mediated transport may be overestimated if radionuclide concentrations used in laboratory studies are too high. Dissociation of the natural inventory of humic associated tetravalent trace metal ions proceeds with a kinetics comparable to the radionuclides added. This, however, is only observed for a small portion of the inventory and extrapolation beyond the observation range is not permissible. Therefore, the key question for application to predictive modeling of the mobility of tetravalent radionuclides in natural groundwater is if the behavior of the natural trace element inventory is applicable or the behavior of radionuclides added in laboratory studies. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Artinger Robert aut Buckau Gunnar aut Zeh P. aut Geraedts K. aut Vancluysen J. aut Maes A. aut Kim Jae-Il aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/12/2003(2003-12-01), 743-750 0033-8230 91:12/2003<743 2003 91 ract https://doi.org/10.1524/ract.91.12.743.23420 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.12.743.23420 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Artinger Robert aut NATIONALLICENCE 700 1- Buckau Gunnar aut NATIONALLICENCE 700 1- Zeh P. aut NATIONALLICENCE 700 1- Geraedts K. aut NATIONALLICENCE 700 1- Vancluysen J. aut NATIONALLICENCE 700 1- Maes A. aut NATIONALLICENCE 700 1- Kim Jae-Il aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/12/2003(2003-12-01), 743-750 0033-8230 91:12/2003<743 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter