Abstract
The paper aims at the analysis of principal factors affecting the interaction of radiocobalt with freshwater solids, important for migration of radiocobalt in surface streams. Uptake of radiocobalt by sediment from a small river have been studied as a function of composition of the sediment, of liquid-to-solid ratio (V/m) and of temperature, using laboratory model experiments. The study of the effect of sediment composition was based on selective extraction of the sediment prior to the uptake and indicated that radiocobalt was sorbed on several components of the sediment simultaneously, probably on clay minerals, organic matter and oxidic coatings. Relative importance of these components depends on the pH and composition of the aqueous phase and on the concentration of radiocobalt. Distribution coefficient Kd characterizing the uptake of radiocobalt is nearly independent of the V/m ratio in V/m range typical for rivers, but decreased at V/m<1.7 dm3·g−1. Increase in temperature from 13°C to 23°C accelerate radiocobalt uptake but did not affect the “equilibrium” value of the uptake. Results obtained are compared with literature data and conclusions are drawn concerning the importance of the factors studied for modelling of radiocobalt migration in rivers.
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Beneš, P., Jurák, M. & Černík, M. Factors affecting interaction of radiocobalt with river sediments. Journal of Radioanalytical and Nuclear Chemistry, Articles 132, 225–239 (1989). https://doi.org/10.1007/BF02136082
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DOI: https://doi.org/10.1007/BF02136082