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[en] An earlier described separation scheme for the actinides, utilizing chromatographic columns with TBP and cation exchange resin under pressure, (HPLC) as means of separation, has been further investigated with emphasis on the behaviour of neptunium. More than 99% of the neptunium can be washed out in pure form already from the first of the two cation exchangers as the monocharged ion NpO2+, which is hardly retained by the resin from weak nitric acid. The strong influence of the strength of the nitric acid on this separation step is demonstrated in the paper. Subsequently, americium, curium and the lanthanides are eluted individually from the second HPLC column by alpha-hydroxyisobutyric acid. (author)
Source
Cecille, L. (Commission of the European Communities, Brussels (Belgium)); Casarci, M.; Pietrelli, L. (ENEA, Rome (Italy)) (eds.); Commission of the European Communities, Brussels (Belgium). Directorate General for Science, Research and Development; ENEA, Rome (Italy); 321 p; ISBN 1-85166-656-7; 
; 1991; p. 213-218; Elsevier Applied Science; Barking (United Kingdom); Technical seminar on new separation chemistry techniques for radioactive waste and other specific applications; Rome (Italy); 16-18 May 1990
; 1991; p. 213-218; Elsevier Applied Science; Barking (United Kingdom); Technical seminar on new separation chemistry techniques for radioactive waste and other specific applications; Rome (Italy); 16-18 May 1990