All reagents were of analytical grade and were used
without further purification. Ammonium hydroxide
(SG 0.88) was used for pH adjustment while oxalic
acid was used as precipitating agents. The extraction
process was performed using diethyl hexyl phosphoric
acid D2EHPA (SG 0.98) with tributylphosphate TBP
(SG 0.979) as a modifier and commercial kerosene as
diluent.