caa a22 4500 378874195 CHVBK 20180305123416.0 cr unu---uuuuu 161128e20030801xx s 000 0 eng 10.1524/ract.91.8.453.20004 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.8.453.20004 Speciation of uranium(VI) at the solid/solution interface: sorption modeling on zirconium silicate and zirconium oxide [Elektronische Daten] [C. Lomenech, R. Drot, E. Simoni] In the field of nuclear waste storage, knowledge of the sorption behavior of radionuclides onto mineral surfaces is of fundamental importance in order to evaluate environmental impacts. We have studied uranyl ion sorption mechanisms onto zirconium silicate and zirconium oxide with a double approach, coupling both macroscopic and structural investigations. The spectroscopic results, reported in a previous paper, allowed a complete determination of the different species involved in the studied sorption reactions. This paper presents the results of the macroscopic part of the study. Surface characterizations of the solids were first carried out: determination of the pH of the point of zero charge, of the surface site densities and of the surface acidity constants. The experimental retention data were then interpreted in terms of a constant capacitance model using the FITEQL code. Results from structural investigation were used to constrain the modeling. This coupled approach led to accurate reactions stoichiometry and associated sorption constants values, since they were determined with respect to different experimental results, both macroscopic and microscopic. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Lomenech C. aut Drot R. aut Simoni E. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/8/2003(2003-08-01), 453-462 0033-8230 91:8/2003<453 2003 91 ract https://doi.org/10.1524/ract.91.8.453.20004 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.8.453.20004 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lomenech C. aut NATIONALLICENCE 700 1- Drot R. aut NATIONALLICENCE 700 1- Simoni E. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/8/2003(2003-08-01), 453-462 0033-8230 91:8/2003<453 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter