caa a22 4500 378927159 CHVBK 20180305123620.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.683.54993 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.683.54993 Measurements and modelling of Pm sorption onto TiO2 and goethite [Elektronische Daten] [Anna-Maria Jakobsson, Yngve Albinsson, Robert S. Rundberg] The sorption of Pm (1×10-9M) onto TiO2 and goethite has been studied as a function of pH and ionic strength (0.01, 0.1M NaClO4) at ambient temperature under N2 atmosphere. For both minerals studied there is no effect of the different ionic strengths and the sorption (log Ka vs. pH) increases with a slope of ∼2. At the same pH sorption is lower on the more positively (or less negatively) charged goethite (pHpzc=8.4) than on the TiO2 (pHpzc=6.2). A comparison to other trivalent cations sorbed on different substrates (made by extracting values from %-sorbed curves and calculating these to Ka) indicate a similar pH-dependence. The results have been fitted using a 1-pK basic Stern model with FITEQL. An a priori restriction was that only one sorption reaction stoichiometry at a time was to be used to keep the number of parameters as small as possible. Outer-sphere and mono-, bi- and tri-dentate inner-sphere complexes were fitted. For each fit the value of the capacitance was varied to find the value that provided the best fit. Two different site densities were used: 1site/nm2 and 2.31sites/nm2. For the low site density the reaction which provides the best fit was: ≡SOH0.5-+Pm+3↔≡SOHPm2.5+ for both minerals. At the high site density the same reaction fits for TiO2 while there are several reactions that are equivalent in the fit for goethite. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Jakobsson Anna-Maria aut Albinsson Yngve aut Rundberg Robert S. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 683-689 0033-8230 92:9-11/2004<683 2004 92 ract https://doi.org/10.1524/ract.92.9.683.54993 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.683.54993 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jakobsson Anna-Maria aut NATIONALLICENCE 700 1- Albinsson Yngve aut NATIONALLICENCE 700 1- Rundberg Robert S. 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), 683-689 0033-8230 92:9-11/2004<683 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter