Table 2.

Equilibrium constants of the chemical species of europium in 0.5 M KNO₃ solution.

Chemical equilibrium equation	log β, FI = 0.5 M, T = 298 K	Reference
Eu3+ + H2O ↔ Eu(OH)2+	−8.53	[42]
Eu3+ + 2H2O ↔ Eu(OH)2+	−17.31	[42]
Eu3+ + 3H2O ↔ Eu(OH)3	−26.35	[42]
Eu3+ + NO3−↔ Eu(NO3)2+	0.29	[43]
Eu3++ CO32−↔ Eu(CO3)+	6.11	[42]
Eu3+ + 2CO32−↔ Eu(CO3)2−	10.45	[44]