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

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

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(V vs. SHE) (V vs. SHE) (V · K −1 )Np(V) + e − Å Np(IV)(12.18) <strong>and</strong> NpO 2 (CO 3 ) 5−3+ e − + 2CO 2 (g) Å Np(CO 3 ) 6−5 (12.19)(g)pot 1 M Na 2 CO (h) 3 room t (0.1 ±0.2) (i) 0.514 (j) [79FED/PER]pot 0.3 M Na 2 CO 3 25 0.267 (k) 0.641 (j) [96DEL/VIT]pot 0.6 M Na 2 CO 3 25 0.188 (k) 0.694 (j) −0.00206 (m)pot 1 M Na 2 CO 3 25 0.226 (k) 0.641 (j) −0.00217 (m)pH=10.27 0.535pot 1.5 M Na 2 CO 3 25 0.207 (k) 0.620 (j) −0.00224 (m)pot I = 0 25 0.124 (0.436 ±0.116)Redox equilibriaMethod Ionic medium (mol · dm −3 ) t ( ◦ C) E ◦′ (V vs. SHE) ReferenceNp(CO 3 ) 6−5 + e − Å Np(CO 3 ) 3−3 + 2CO3 2−(n)vlt 1 M Na 2 CO 3 room t −(1.32 ± 0.1) [79FED/PER]vlt 1 M K 2 CO 3 room t −(1.3 ± 0.1) [84VAR/HOB]vlt 2 M Na 2 CO 3 room t −(1.2 ± 0.1)(Continued on next page)12.1 Neptunium carbon compounds <strong>and</strong> complexes 257

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