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Information × Registration Number 0307U001045, 0105U006206 , R & D reports Title Research of permanence of the caesium-137 long-term fixation by an organic-mineral soil complex popup.stage_title Дослідження сорбції Cs-137 окремими фракціями ґрунту. Head Kononenko Ludmilla Vassyllivna, Registration Date 17-01-2007 Organization Institute of environment geochemistry popup.description2 Experimental model research of dynamics of Cs-137 sorption by sod-podzol soil and its separate fractions was performed. It is experimentally determined, that Cs-137 unexchange sorption takes place in two stages - during the first days there is rapid sorption of about 20% soluted Cs-137, further there is more slow Cs-137 unexchange sorption by soil. Comparison of dynamics of Cs-137 sorption by different in size fractions of soil testifies that soil fraction tineness not substantially affects the rate of Cs-137 unexchange fixation, however it acts considerable part in the process of Cs-137 remobilization. Rate and efficiency of Cs-137 remobilization decreases with reduction of the soil fraction tineness. The thermodynamics modelling of Cs-137 sorption by mineral part of sod-podzol soil was performed. It is set, that the models of solid solution and surface complexing on illite are able to describe dependence of Cs sorption upon pH, however only the models of surface complexing allow to reproduce theisotherms of sorption. It is set, that kinetics of total Cs-137 sorption, its unexchange fixing and remobilization are satisfactorily described by the first order binomial kinetic equations. On the first stage of Cs-137 sorption by sod-podzol soil the rate of Cs unexchange fixation considerably greater than its remobilization rate; the second stage (after 11 days) is characterized by commensurability of rate constants of Cs-137 unexchange fixing and its remobilization. Product Description popup.authors popup.nrat_date 2020-04-02 Close