Metal ion

0.05 M HFAc

0.05 M TFA

Kerosene

[Bmim][TF2N]

Kerosene

[Bmim][TF2N]

%La(III)

7.82 ± 3.26

3.68 ± 0.47

10.67 ± 1.99

9.01 ± 2.01

%Ce(III)

10.06 ± 4.39

12.22 ± 1.80

15.83 ± 1.11

16.46 ± 0.41