Acid concentration (Initial pH) Procedure (Final pH) Fe remaining in the aqueous phase (%) Al remaining in the aqueous phase (%)
0.50 M OA (0.93) KOH addition (13.87) 0.001 93.2
H2SO4 addition (10.52) 0.002 0.16
0.25 M KTO (1.51) KOH addition (13.85) 0.002 92.8
H2SO4 addition (10.56) 0.002 0.15
0.50 M KHO (2.47) KOH addition (13.88) 0.001 92.6
H2SO4 addition (10.48) 0.001 0.24