Extractants

Equilibrium time

Equilibrium pH

${\text{PO}}_4^{3-}$

0.1 M NaOH

24 hours

11.6

400

0.2 M NaOH

24 hours

12.3

424

0.3 M NaOH

24 hours

12.8

2920

0.4 M NaOH

24 hours

13.1

2620

0.5 M NaOH

24 hours

13.2

2730