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chemical thermodynamics of neptunium and plutonium - U.S. ...

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LIST OF TABLESxxi20.2 Experimental equilibrium data for the <strong>plutonium</strong>(IV) nitrate system . . . . . . . . . . . . 40720.3 Experimental equilibrium data for the dioxo<strong>plutonium</strong>(VI) nitrate system . . . . . . . . . 41420.4 Experimental equilibrium data for the Pu(IV) phosphate system . . . . . . . . . . . . . . . 41720.5 Literature equilibrium constants for the Pu(VI) phosphate system . . . . . . . . . . . . . . 41921.1 Summary <strong>of</strong> experimental results concerning PuO 2+2 -CO2− 3complexes. . . . . . . . . . . 43221.2 Recommended values in the Pu(VI) carbonate system . . . . . . . . . . . . . . . . . . . . 43321.3 Experimental equilibrium data for the <strong>plutonium</strong>(III) thiocyanate system . . . . . . . . . . 44323.1 Authors list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 543A.1 Calculated <strong>and</strong> observed values for the first hydrolysis constants <strong>of</strong> several tripositive ions(from [54HIN]). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 583A.2 Equilibrium constants referring to Reaction (A.33) as reported in [69KRY/KOM,69KRY/KOM3] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 620A.3 Equilibrium constants referring to Reaction (A.34) as reported in [69KRY/KOM2,69KRY/KOM4] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 621A.4 Values <strong>of</strong> the formation constant <strong>of</strong> NpSO 2−4 from the reaction <strong>of</strong> Np 4+ with HSO − 4 basedon a recalculation <strong>of</strong> the results <strong>of</strong> Patil <strong>and</strong> Ramakrishna [73PAT/RAM]. . . . . . . . . . 645A.5 Thermodynamic constants <strong>of</strong> M(IV) hydrolysis at ≈ 25 ◦ Casgivenby[74SOL]. . . . . . . 651A.6 St<strong>and</strong>ard potentials (I = 0) from measurements <strong>of</strong> the Np(VI)/Np(V) redox couple inaqueous carbonate media. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 671A.7 Formation constants <strong>of</strong> thiocyanate complexes reported in [78RAO/BAG2] at different temperatures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 674A.8 Stability constants <strong>of</strong> Np(V) <strong>and</strong> Pu(V) complexes with various lig<strong>and</strong>s as given in[78MOS/POZ] <strong>and</strong>[79MOS/POZ]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 680A.9 Formation constants for neutral <strong>plutonium</strong>(IV) complexes as given by [80SOL/ZAK]. . . . 685A.10 Hydrolysis constants for trivalent Pu, Am, Sm <strong>and</strong> Eu as given by [82NAI/CHA]. . . . . . 689A.11 Results from refitting Maya’s solubility data for Np(V) in carbonate solutions. . . . . . . . 692A.12 Values <strong>of</strong> the formation constant <strong>of</strong> Pu(SO 4 ) − 2 from the reaction <strong>of</strong> Pu3+ with HSO − 4 basedon a recalculation <strong>of</strong> the results <strong>of</strong> Nash <strong>and</strong> Clevel<strong>and</strong> [83NAS/CLE2]. . . . . . . . . . . 694A.13 Values <strong>of</strong> temperature coefficients for st<strong>and</strong>ard potentials from Blanc <strong>and</strong> Madic[84BLA/MAD]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 696A.14 Table <strong>of</strong> values <strong>and</strong> limiting values <strong>of</strong> formation constants based on reassessment <strong>of</strong> Maya’spotentiometric titration data [84MAY] . . . . . . . . . . . . . . . . . . . . . . . . . . . . 704A.15 Calculation <strong>of</strong> the maximum value <strong>of</strong> the formation constant <strong>of</strong> some complexes <strong>of</strong> Np(IV) 715A.16 Results <strong>of</strong> recalculations <strong>of</strong> the data <strong>of</strong> Br<strong>and</strong> <strong>and</strong> Cobble [70BRA/COB] . . . . . . . . . . 726A.17 Values <strong>of</strong> the formation constant for NpO 2 CO − 3 in 0.1 M NaClO 4 from various analyses<strong>of</strong> the spectrophotometric measurements <strong>of</strong> Nitsche, St<strong>and</strong>ifer <strong>and</strong> Silva [90NIT/STA]. . . 737A.18 Experimental conditions <strong>of</strong> the [90RIG] publication spectrophotometric measurements. . . 740A.19 Np(V) carbonate complexation constants deduced from the spectrophotometric measurementsreported in [90RIG]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 741A.20 Curve fitting results <strong>of</strong> solubility measurements <strong>of</strong> Np(V) in 2 M NaClO 4 carbonate/bicarbonate/carbonicacid aqueous solutions [84VIT, 85CÔM, 85KIM, 86GRE/ROB,90RIG] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 743A.21 Determination <strong>of</strong> the stoichiometry <strong>of</strong> a hydrated Na (2x−1) NpO 2 (CO 3 ) x (s) solid phasefrom solubility data [84VIT, 85CÔM, 85KIM, 86GRE/ROB, 90RIG] . . . . . . . . . . . . 744A.22 Formation constants <strong>of</strong> fluoride complexes <strong>of</strong> tetravalent actinides as reported by Sawant,Chaudhuri <strong>and</strong> Patil [90SAW/CHA2] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 748A.23 Formation constants <strong>of</strong> fluoride complexes <strong>of</strong> tetravalent actinides [90SAW/CHA2] aftercorrection for the protonation constant <strong>of</strong>fluoride . . . . . . . . . . . . . . . . . . . . . . 749A.24 Comparison <strong>of</strong> the formation constants <strong>of</strong> the U(IV) fluoride complexes <strong>of</strong>[90SAW/CHA2] with those selected in the TDB uranium review [92GRE/FUG] . . . . . . 749A.25 Curve fitting results for solubility measurements <strong>of</strong> Np(V) in carbonate/bicarbonate/carbonicacid aqueous solutions [91KIM/KLE, 94NEC/KIM, 95FAN/NEC, 95NEC/FAN,95NEC/RUN] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 752

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