Abstract
Desorption of 90Sr and 137Cs from flood plain warps, meadow sod, humus-containing sandy loam, peat, clays, limonite, meadow marl, and friable rocks of the adjacent catchment areas (moraine clay, loam, sandy loam) was studied. 137Cs is sorbed the most strongly on clays by the mechanism of isomorphic ion-exchange incorporation into the crystal lattice of montmorillonite-type minerals. 137Cs is also tightly fixed on buried and peaty soils due to association with the poorly mobile species of humic acids and humin. The strong fixation of 90Sr on amorphous iron hydroxides is caused by its association with poorly soluble ferrite-type minerals. Sorption of 90Sr on peaty soils can be attributed to their association with aluminum and iron-containing organomineral complexes. 137Cs sorbed on flood plain warps, sandy loams, and loams exhibits increased mobility and is leached with all the tested desorbing solutions. These deposits apparently contribute maximally to the redistribution of radiocesium over flood plain and the adjacent catchment areas. The desorption efficiency of cations of the desorbing solutions decreases in the order Cs+ > K+ > Fe3 + > NH4 + > Ca2 + > H+ for radiocesium and Fe3 + > Sr2 + > K+ > H+ > Ca2 + > NH4 + for radiostrontium.
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Kuznetsov, V.A., Onoshko, M.P. & Generalova, V.A. Desorption of 90Sr and 137Cs from Flood Plain Deposits of the Sozh River and Rocks of the Adjacent Catchment Areas. Radiochemistry 45, 518–523 (2003). https://doi.org/10.1023/A:1026228413309
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DOI: https://doi.org/10.1023/A:1026228413309