Influence of temperature on the speciation of radionuclides sorbed onto rocks from the Nizhnekansky massif

Konevnik, Yu. V.; Zakharova, Еlena V.; Мартынов, К. В.; Shiryaev, A. A.

doi:10.1134/s1066362217020171

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…Sorption experiments demonstrate the capability of rock to retain certain ions but do not provide sufficient information on the methods to fix these on rock. Selective desorption was used to identify the 90 Sr and 137 Сs occurrence forms which makes it possible to extract sequentially the radionuclides distributed by various geological forms (Konevnik et al 2017). The authors used the selective desorption method based on the modified Tessier methodology (Table 6) (Tessier et al 1979).…”

Section: Sequential Extractionmentioning

confidence: 99%

Sorption of 90Sr and 137Cs on clays used to build safety barriers in radioactive waste storage facilities

Volkov¹,

Zharkova²,

Karaseva³

et al. 2021

NUCET

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The purpose of the work was to investigate the sorptive capacity of natural clay samples with respect to 90Sr and 137Cs to assess the possibility of using these as components of protective barriers at radioactive waste isolation facilities. Bentonite clays of the Zyryanskoye and Desyaty Khutor deposits and high-melting clay of the Kampanovskoye deposit were selected for the investigation. The capacity of clays for sorption through ionic exchange is characterized by the value of the cation exchange capacity (CEC). In the process of sorption experiments, all of the test clays displayed a high rate of extracting strontium and cesium radionuclides from aqueous solutions. It was shown that the sorption of 90Sr is affected by the content of montmorillonite in the samples: bentonite clays absorb up to 98–99% of the initial radionuclide content in the solution, while about 80% of strontium is sorbed by high-melting clay. Cesium is practically fully sorbed by the tested samples and the degree of sorption amounts to over 99%, the highest value of the distribution coefficient having been recorded for the Kampanovskoye sample (Kd = 5.0×103 cm3/g). The method of sorbed radionuclides fixation on the clay samples were identified by selective desorption using the modified Tessier methodology. It was shown that strontium ions are more mobile than ions of cesium up to 97% of which is retained by clays.

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Section: Sequential Extractionmentioning

confidence: 99%