Archives → 2019 → Vol. 59, No. 5 → pp. 546-552
Article
The Role of Natural Organic Substances in the Migration Processes of Tritium
Chebotina M.J.1, Polyakov E.V.2, Guseva V.P.1
1 Institute of Plant and Animal Ecology, Ural Branch of Russian Academy of Sciences, Yekaterinburg, Russia. 2 Institut of Solid State Chemistry, Ural Branch of Russian Academy of Sciences, Yekaterinburg, Russia
Abstract
Laboratory experimental data on tritium sorption from aqueous solution by humic acids (HA) are discussed in the paper. It has been established that the level of tritium sorption by HA depends on the sorption exposure time and HA concentration in the solution. The values of estimated distribution coefficients of the radionuclide between aqueous and HA phases testify in favor of the isotope effect of the tritium – protium exchange as a driving force of tritium sorption. The data on tritium vertical migration in the bottom ground sediments of a water reservoir cooler as a function of the organic matter content, temperature and chemical contact duration in the interface water – ground sediments are discussed in the paper. It has been estimated that about 10 mole percent of tritium incorporated in the ground sediments are bound by organic matter, whereas another fraction of tritium tends to migrate within ground sediments in the form of capillary and adsorbed water.
Keywords
tritium, humic acids, organic matter, ground, distribution coefficients, migration
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