This study concerns the removal of the 137Cs+ and 60Co2+ β+γ-radioactive ions in Azolla caroliniana Willd. water fern. The living fern and two different types of biosorbent prepared from Azolla caroliniana were tested to remove the above-mentioned radioactive ions from dilute solutions, in the absence and in the presence of the ionic competition. Effective 137Cs+ and 60Co2+ ions removal from low radioactive wastewaters was demonstrated. The time dependent K d(t) values were calculated from the absorption data. These results indicate that removal process achieved equilibrium in about 120 min and that it involves two steps: rapid and slow absorption; the active process (metabolic bioaccumulation on the living fern) was responsible for above one half of the total removal process. A thin layer radiochromatography study leads to the conclusion that the biochemical components in which 137Cs+ and 60Co2+ place themselves are of a polysaccharide and lipoid fractions.
 K.H. Lieser: “Radionuclides in the geosphere: Sources, mobility, reaction in natural waters and interaction with solids”, Radiochim. Acta, Vol. 70/71, (1990), pp. 355–375.
 E.V. Kvasnikova, E.D. Stukin, V.N. Golosov, N.N. Ivanova and A.V. Panin: “Caesium-137 behaviour in small agricultural catchments on the area of the Chernobyl contamination”, Czech. J. Phys., Vol. 49, No. 1, (1999), pp. 181–187.
 B.C. Wolverton: NASA Technical Memorandum TM-X-72721/1975.
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