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. Author manuscript; available in PMC: 2020 Jun 2.
Published in final edited form as: Appl Geochem. 2020 May;116:10.1016/j.apgeochem.2020.104561. doi: 10.1016/j.apgeochem.2020.104561

Table 4.

Solubility constants for hydrous, amorphous Pu(IV) solids and Pu4+ hydrolysis constants in the ThermoChimie database

Reaction log K0 or βn0 Reference
Pu(OH)4(am) + 4 H+ ⇌ Pu4+ + 4 H2O −0.80 ± 1.3 Lemire and Garisto (1989), from Rai (1984)
PuO2·2H2O(am) + 4 H+ ⇌ Pu4+ + 4 H2O −2.37 ± 0.52 NEA-TDB: Guillaumont et al. (2003)
Pu4+ + H2O ⇌ PuOH3+ + H+ 0.60 ± 0.20 NEA-TDB: Guillaumont et al. (2003)
Pu4+ + 2 H2O ⇌ Pu(OH)22+ + 2 H+ 0.60 ± 0.30 NEA-TDB: Guillaumont et al. (2003)
Pu4+ + 3 H2O ⇌ Pu(OH)3+ + 3 H+ −2.30 ± 0.40 NEA-TDB: Guillaumont et al. (2003)
Pu4+ + 4 H2O ⇌ Pu(OH)40 + 4 H+ −8.5 ± 0.50 NEA-TDB Guillaumont et al. (2003)