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Batch extraction of U(VI) by 1.1 M solution of tri- iso -amyl phosphate (T i AP) in  n -dodecane ( n -DD) from uranyl nitrate solutions in nitric acid media has been investigated as a function of metal loading and equilibrium aqueous phase acidity at 303 K. A method adopted for free acidity determination by using a mixture of potassium oxalate and sodium fluoride for complexing U(VI) has been validated by comparing the data generated in the present study with literature data available for tri- n -butyl phosphate (TBP) under identical conditions. Extraction and stripping behaviour of 1.1 M T i AP/ n -DD-U(VI)/HNO 3  and 1.1 M TBP/ n -DD-U(VI)/HNO 3  systems have been compared by carrying out extraction, scrubbing and a series of stripping in cross-current mode. Stripping behaviour of both the solvents loaded with U(VI) and HNO 3  has also been investigated as a function of time to understand the effects of nitric acid induced degradation on stripping.

Extraction and stripping behaviour of tri- iso -amyl phosphate and tri- n -butyl phosphate in n -dodecane with U(VI) in nitric acid media