caa a22 4500 378927310 CHVBK 20180305123621.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.651.54992 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.651.54992 Uranium adsorption on weathered schist - intercomparison of modelling approaches [Elektronische Daten] [Timothy E. Payne, James A. Davis, Michael Ochs, Markus Olin, Cherry J. Tweed] Experimental data for uranium adsorption on a complex weathered rock were simulated by twelve modelling teams from eight countries using surface complexation (SC) models. This intercomparison was part of an international project to evaluate the present capabilities and limitations of SC models in representing sorption by geologic materials. The models were assessed in terms of their predictive ability, data requirements, number of optimised parameters, ability to simulate diverse chemical conditions and transferability to other substrates. A particular aim was to compare the generalised composite (GC) and component additivity (CA) approaches for modelling sorption by complex substrates. Both types of SC models showed a promising capability to simulate sorption data obtained across a range of chemical conditions. However, the models incorporated a wide variety of assumptions, particularly in terms of input parameters such as site densities and surface site types. Furthermore, the methods used to extrapolate the model simulations to different weathered rock samples collected at the same field site tended to be unsatisfactory. The outcome of this modelling exercise provides an overview of the present status of adsorption modelling in the context of radionuclide migration as practised in a number of countries worldwide. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Payne Timothy E. aut Davis James A. aut Ochs Michael aut Olin Markus aut Tweed Cherry J. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 651-661 0033-8230 92:9-11/2004<651 2004 92 ract https://doi.org/10.1524/ract.92.9.651.54992 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.651.54992 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Payne Timothy E. aut NATIONALLICENCE 700 1- Davis James A. aut NATIONALLICENCE 700 1- Ochs Michael aut NATIONALLICENCE 700 1- Olin Markus aut NATIONALLICENCE 700 1- Tweed Cherry J. 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), 651-661 0033-8230 92:9-11/2004<651 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter