Factors affecting interaction of radiocesium with freshwater solids View Full Text


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Article Info

DATE

1992-06

AUTHORS

P. Beneš, M. Černík, P. Lam Ramos

ABSTRACT

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. More... »

PAGES

201-218

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02040714

DOI

http://dx.doi.org/10.1007/bf02040714

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1038858489


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