caa a22 4500 469110147 CHVBK 20180323133108.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF02040714 doi (NATIONALLICENCE)springer-10.1007/BF02040714 Factors affecting interaction of radiocesium with freshwater solids [Elektronische Daten] II. Contact time, concentration of the solid and temperature [P. Beneš, M. Černík, P. Lam Ramos] The paper aims at the analysis of principal factors affecting the interaction of radiocesium with freshwater solids, important for the migration of radiocesium in rivers. Uptake and release of radiocesium by bottom sediment and suspended solids from a small stream were studied as a function of contact time during the uptake and releases, of concentration of the solid phases and of temperature, using laboratory model experiments. Kinetics of the uptake were found to be singificantly affected by temperature and concentration of the solid phase. The kinetics and the concentration effect can be quantitatively described using kinetic model of two parallel or consecutive reactions. Kinetic parameters for the model were determined. Distribution coefficient Kd is independent of sediment concentration in the range of 20-70 mg·dm−3 but passes through a maximum at higher concentration values. Release of radiocesium adsorbed on the freshwater solids was found to be quite rapid and a simple kinetics of the release from freshwater solids was observed. The amount released decreased with increasing contact time of radiocesium with solid phase. Quantitative evaluation of the release revealed partial irreversibility of radiocesium uptake on the solids studied. Results obtained are compared with literature data and conclusions are drawn on the importance of the factors studied for modeling of radiocesium migration in rivers. Akadùmiai Kiadó, 1992 Beneš P. Department of Nuclear Chemistry, Technical University of Prague, Břehová, 7, 115 19, Prague 1, (ČSFR) aut Černík M. Department of Nuclear Chemistry, Technical University of Prague, Břehová, 7, 115 19, Prague 1, (ČSFR) aut Lam Ramos P. Department of Nuclear Chemistry, Technical University of Prague, Břehová, 7, 115 19, Prague 1, (ČSFR) aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 159/2(1992-06-01), 201-218 0236-5731 159:2<201 1992 159 10967 https://doi.org/10.1007/BF02040714 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02040714 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Beneš P. Department of Nuclear Chemistry, Technical University of Prague, Břehová, 7, 115 19, Prague 1, (ČSFR) aut NATIONALLICENCE 700 1- Černík M. Department of Nuclear Chemistry, Technical University of Prague, Břehová, 7, 115 19, Prague 1, (ČSFR) aut NATIONALLICENCE 700 1- Lam Ramos P. Department of Nuclear Chemistry, Technical University of Prague, Břehová, 7, 115 19, Prague 1, (ČSFR) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 159/2(1992-06-01), 201-218 0236-5731 159:2<201 1992 159 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer