The tail-end purification of Am from Pu loading effluents in 7.5M HNO3 containing ∼160 mg l−1 Am and ∼1.2 mg l−1 Pu has been carried out. With 0.2M CMPO+1.2M TBP in dodecane as the extractant and stripping by 0.04M HNO3+0.05M NaNO2, the Pu level is brought down to ∼31.2 μg l−1. When the acidity was reduced to 4.2M HNO3, one contact with 20% TLA/dodecane and subsequent extraction by a mixture of CMPO and TBP and stripping with 0.04M HNO3+0.05M NaNO2 gave Am samples without any detectable amounts of Pu. The recovery of Am was ∼90% by the first procedure and ∼98% by the second one.
J. N. Mathur, Murali, M. S., Natarajan, P. R., Badheka, L. P., Banerji, A., Michael, K. M., Kapoor, S. C., and Dhumwad, R. K., “Tail-end purification of americium from plutonium loading effluents using a mixture of octyl (phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide and tri-N-butyl phosphate”, Journal of radioanalytical and nuclear chemistry, vol. 165, pp. 219–227, 1992.