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[en] To check the possibility of removing actinides from acidic waste solution produced by Italian fuel reprocessing experimental plants, the use of Octyl (phenyl)-N,N-diisobutylcarbamoyl methyl phosphine oxide (CMPO) sorbed on supporting solid (SiO2) for the extraction of UO22+ and Pu4+ from nitric acid aqueous solutions, has been investigated. Distribution coefficients (Kd), kinetics and sorption isotherms of this sorbent, briefly called SiC (Silica and CMPO) for each ion in nitric acid solutions (0.5+5N range) have been determined. The Kd values show that SiC can be successfully used to separate actinides from nitric acid solution in liquid radioactive wastes decontamination as well as in radioanalytical determination. SiC filled with 0.6 mmole of CMPO per gram of SiO2 shows, for UO22+, a good agreement with the molar ratio found by solvent extraction and with isotherm model at the same time. (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. 87-94; 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. 87-94; 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