Application of Calixarenes as Macrocyclic Ligands for Uranium(VI): A Review

Table 3

Selectivity factor for UO₂²⁺ (𝐾_uranyl/𝐾_M^𝑛+).

Entry	Extraction agent	Metal (M^𝑛+)	𝐾uranyl/𝐾M^𝑛+	Reference
1	3	Mg^2+	>10^17	[50]
2	3	Ni^2+	10^17.0	[50]
3	3	Zn^2+	10^13.7	[50]
4	3	Cu^2+	10^10.6	[50]
5	5	Mg^2+	>10^17	[50]
6	5	Ni^2+	10^15.3	[50]
7	5	Zn^2+	10^13.1	[50]
8	5	Cu^2+	10^12.0	[50]