caa a22 4500 465732003 CHVBK 20180323111744.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF02060187 doi (NATIONALLICENCE)springer-10.1007/BF02060187 Factors affecting interaction of radiostrontium with river sediments [Elektronische Daten] [P. Beneš, R. Poliak] Uptake of radiostrontium by sediments from two small streams was studied as a function of pH and composition of aqueous phase, of the concentration of strontium, of contact time, temperature and liquid-to-solid ratio (V/m), using laboratory model experiments. Between pH 5 and 12 the uptake increased with pH and shifted to higher pH values with increasing V/m ratio. Addition of cations suppressed the uptake in the order Na+<K+<Ca2+. Increase in strontium concentration had negligible effect up to 10−5-10−4 mol·dm−3 concentration due to high concentrations of dissolved and exchangeable strontium present in the systems. The V/m ratio had no influence on Kd in the range of V/m=20-446 cm3 · g−1 but Kd value for V/m=0.79 cm3 · g−1 was significantly lower. Two-step kinetics of the uptake was observed in most cases with a rapid first step (<100 min) followed by a slow increase. No difference was found between the uptake at 10°C and 22°C. Adsorbed radiostrontium could be easily desorbed with river water. The easiness of desorption decreased with repeated desorption. Drying of sediment did not affect the first desorption, repeated desorptions slightly decreased. Conclusions were drawn on the mechanism of radiostrontium uptake and on the importance of the factors studied for modelling of radiostrontium migration in rivers. Akadémiai Kiadó, 1990 Beneš P. Department of Nuclear Chemistry, Technical University of Prague, Brehová 7, 115 19, Prague 1, (Czechoslovakia) aut Poliak R. Department of Nuclear Chemistry, Technical University of Prague, Brehová 7, 115 19, Prague 1, (Czechoslovakia) aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 141/1(1990-07-01), 75-90 0236-5731 141:1<75 1990 141 10967 https://doi.org/10.1007/BF02060187 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02060187 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Beneš P. Department of Nuclear Chemistry, Technical University of Prague, Brehová 7, 115 19, Prague 1, (Czechoslovakia) aut NATIONALLICENCE 700 1- Poliak R. Department of Nuclear Chemistry, Technical University of Prague, Brehová 7, 115 19, Prague 1, (Czechoslovakia) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 141/1(1990-07-01), 75-90 0236-5731 141:1<75 1990 141 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer