The features of Cs sorption onto peaty-podzolic-gleyic soil

Semenkova, A.; Izosimova, Y.; Rzhevskaia, A.; Skryleva, P.; Vlasova, I.; Romanchuk, A.; Kalmykov, S.; Tolpeshta, I.

Авторы: Semenkova Anna, Izosimova Yulia, Rzhevskaia Aleksandra, Skryleva Polina, Vlasova Irina, Romanchuk Anna, Kalmykov Stepan, Tolpeshta Inna
Журнал: Chemosphere
Номер: 339
Год издания: 2023
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 1
Последняя страница: 10
Номер статьи: 139580
DOI: 10.1016/j.chemosphere.2023.139580
Аннотация: This article studies sorption regularities and estimates the strength of 137Cs fixation by various soil horizons inpeaty-podzolic-gleyic soils under a model experiment. The interaction time varied from 1 week to 3 monthswhile Cs concentration varied from trace to micromolar concentrations. To understand the interaction mechanismsof cesium with individual soil components, we used the method of sequential removal of organic matterand non-silicate iron compounds from the soil before the sorption experiment.Illite and vermiculite were found to be the main soil components for radiocesium sorption in the mineral soilhorizons. The highly selective positions (FES – frayed edge sites) of the abovementioned minerals fixed radiocesiumso strongly that even strong acid solutions could not extract it from soil. Organic matter significantlycontributed to the fixation of radiocesium in the soil only in the ELih horizon which contained 4.71% Corg. In theELg horizon, a small amount of organic matter was able to inhibit sorption by blocking highly selective toradiocesium FES. The Tessier sequential extraction method of radiocesium revealed that all the studied soilsamples could strongly fix the radionuclide. Increasing the interaction period up to three months under periodicwetting and drying contributed to the increased proportion of strongly bound 137Cs. The results of sorptionexperiments carried out before and after the removal of non-silicate iron compounds from the soil indicate that137Cs has little or no sorption on the surface of iron hydroxides.
Добавил в систему: Толпешта Инна Игоревна

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