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• W2074106868 abstract "Summary The sorption of Pm (1×10 -9 M) onto TiO 2 and goethite has been studied as a function of pH and ionic strength (0.01, 0.1 M NaClO 4 ) at ambient temperature under N 2 atmosphere. For both minerals studied there is no effect of the different ionic strengths and the sorption (log K a vs . pH) increases with a slope of ∼2. At the same pH sorption is lower on the more positively (or less negatively) charged goethite (pH pzc =8.4) than on the TiO 2 (pH pzc =6.2). A comparison to other trivalent cations sorbed on different substrates (made by extracting values from %-sorbed curves and calculating these to K a ) indicate a similar pH-dependence. The results have been fitted using a 1-p K 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: 1 site/nm 2 and 2.31 sites/nm 2 . For the low site density the reaction which provides the best fit was: ≡SOH 0.5- +Pm +3 ↔≡SOHPm 2.5+ for both minerals. At the high site density the same reaction fits for TiO 2 while there are several reactions that are equivalent in the fit for goethite." @default.
• W2074106868 created "2016-06-24" @default.
• W2074106868 creator A5022619985 @default.
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• W2074106868 date "2004-11-01" @default.
• W2074106868 modified "2023-10-18" @default.
• W2074106868 title "Measurements and modelling of Pm sorption onto TiO2and goethite" @default.
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• W2074106868 doi "https://doi.org/10.1524/ract.92.9.683.54993" @default.
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