caa a22 4500 378927078 CHVBK 20180305123620.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.677.55009 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.677.55009 Interactions between anionic complex species of actinides and negatively charged mineral surfaces [Elektronische Daten] [Tetsuji Yamaguchi, S. Nakayama, T. Yoshida] Sorption of actinides onto negatively charged mineral surfaces was investigated under conditions that actinides were predominantly present as anionic complex species. U(VI), Np(V) and Sn(IV) were prepared as 1mol kg-1 Na-ClO4/OH solutions and equilibrated with γ-Al2O3 at pcH 11-13.6 where these elements form UO2(OH)42-, NpO2(OH)2- and Sn(OH)5- species, respectively. Sorption of Np(IV), Th(IV) and Am(III) on amorphous SiO2 and on γ-Al2O3 was investigated in 0.03-0.3mol kg-1 Na-HCO3/CO3 solutions where these actinides are expected to be stable as anionic carbonate complexes. Distribution coefficients of U(VI), Np(V), Sn(IV), Th(IV) and Am(III) decreased with the increasing pH or with the increasing carbonate concentrations. The monotonous decrease in the distribution coefficients in the investigated pcH range suggests that anionic complex species of actinides were not sorbed on negatively charged mineral surfaces. A proportional relation was found between the experimentally obtained Kd values and calculated mole fraction of electrically neutral species in equilibrated solutions. Sorption occurs under the condition that both actinides and mineral surfaces are negatively charged because minor neutral species are sorbed on mineral surfaces. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Yamaguchi Tetsuji aut Nakayama S. aut Yoshida T. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 677-682 0033-8230 92:9-11/2004<677 2004 92 ract https://doi.org/10.1524/ract.92.9.677.55009 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.677.55009 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamaguchi Tetsuji aut NATIONALLICENCE 700 1- Nakayama S. aut NATIONALLICENCE 700 1- Yoshida T. 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), 677-682 0033-8230 92:9-11/2004<677 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter