Extractant

Oxidant

Initial

(mV)

Final Potential (mV)

Extraction (%)

Separation factor

La

Ce

Pr

Nd

Ce/La

Pr/Ce

Nd/Pr

P507

None*

550

550

3

7

12

15

2.4

1.8

1.3

P507

Na₂S₂O₈

930

600

6

12

15

17

2.1

1.3

1.2

P507

K₂S₂O₈

985

580

7

13

16

18

2.0

1.3

1.2

D2EHPA

None**

550

540

11

22

30

32

2.4

1.5

1.1

D2EHPA

Na₂S₂O₈

930

580

16

28

37

42

2.1

1.5

1.1

D2EHPA

K₂S₂O₈

985

600

16

27

38

39

2.0

1.5

1.1