pH = 11 - SKB

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PDF rendering: DokumentID 1415884, Version 1.0, Status Godkänt, Sekretessklass ÖppenBased on those results, we recommend including in the Simple Functions Spreadsheettool the whole set of thermodynamic data detailed in Table 4-23.Table 4-23. Thermodynamic data for the Am/Cm -P system estimated and selected inthis work. An stands for Am and Cm.SpeciesReactionAmLog Kº eqCmAnH 2 PO 42+AnHPO 4+An 3+ + H 2 (PO 4 ) - ↔ AnH 2 PO 42+An 3+ + H 2 (PO 4 ) - ↔ H + + AnHPO 4+2.43 ± 0.5 2.43 ± 0.5-1.78 ± 0.5 -1.72 ± 0.5An(HPO 4 ) 2-An 3+ + 2H 2 (PO 4 ) - ↔ 2H + + An(HPO 4 ) 2- -5.35 ± 0.5 -5.24 ± 0.5AnPO 4 (aq) An 3+ + H 2 PO 4 - ↔ 2H + + AnPO 4 (aq) -7.83 ± 0.5 -7.71 ± 0.5An(PO 4 ) 23-An 3+ + 2H 2 PO 4 3- ↔ 4H + + An(PO 4 ) 23--19.60 ± 0.5 -19.35 ± 0.5Solid phaseReactionAmLog Kº eqCmAn(PO 4 )·xH 2 O An 3+ + H 2 PO 3- 4 + xH 2 O ↔ 2H + +- 4.96 ± 0.5 4.92 ± 0.5An(PO 4 )·xH 2 O47
PDF rendering: DokumentID 1415884, Version 1.0, Status Godkänt, Sekretessklass Öppen4.3 Simple Functions Spreadsheet Tool updateThe aim of this section is to briefly summarize how the selected thermodynamic datafrom section 4.2 has been introduced in the Simple Functions Spreadsheet tool. Itshould be noticed that both versions of the spread sheet, VERSION A (designed tocalculate radionuclide solubility limits in representative groundwater compositionssupplied by the user) and VERSION B (designed for solubility assessments in agroundwater that has interacted with Fe-corrosion products), have been successfullyupdated.4.3.1 DON’T TOUCH sheetIn this sheet, data for phosphate hydrolysis as well as calcium complexation and solidprecipitation, have been introduced (Figure 4-25 and Figure 4-26). In addition,calculations for obtaining the Saturation Index of the solid phase hydroxyapatite(Ca 5 (PO 4 ) 3 (OH)) have also been introduced.Figure 4-25. Snapshot of the amended DON’T TOUCH sheet (VERSION A).48
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