Method of studying the degradation of soil macroaggregates based on the self-absorption of 137Cs β radiation

Fokin, A. D.; Torshin, S. P.

doi:10.1134/s1064229313040029

Cited by 3 publications

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“…The two radioisotopes remain in HLW, the raffinate of PUREX which works for the recovery of uranium and plutonium from the spent nuclear fuel. Removal of 135 Cs and 137 Cs is necessary as their radioactivity brings adverse effect on environment and the treatment of HLW [23][24][25]. 137 Cs is also a heat generator element and hampers the final vitrification of HLW [26].…”

Section: Introductionmentioning

confidence: 99%

Extraction equilibrium and thermodynamics of cesium with a new derivative of calix[4]biscrown

Dai

Zhang

2014

J Radioanal Nucl Chem

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A new supermolecular recognition agent named tetra-tert-butyl-calix[4]-bis[(4-methly-1,2-phenylene-crown-6] (TertButylCalixC) was synthesized. Batchwise experiments of extraction of Na(I), K(I), Rb(I), Cs(I), Sr(II), Ba(II), Ru(III) and Fe(III) from aqueous solution with TertButylCalixC/o-nitroanisole were carried out. Effects of HNO 3 concentration, contact time and temperature on the extraction behavior were examined. The equilibrium established within 30 min implied a fast extraction kinetics. The optimal operation temperature was 298 K. Stoichiometry of TertButylCalixC and Cs(I) by electrospray ionization mass spectrometry characterization revealed 1:1 molar ratio. It was observed that the extraction system of TertButylCalixC/o-nitroanisole was effective for selective removal of Cs(I), showing remarkable separation performance.

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Section: Introductionmentioning

confidence: 99%

Extraction equilibrium and thermodynamics of cesium with a new derivative of calix[4]biscrown

Dai

Zhang

2014

J Radioanal Nucl Chem

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Input of 137Cs and 90Sr into plants from the surface of soil aggregates and the intraped space

et al. 2014

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Role of plants in the spatial differentiation of 137Cs and 90Sr statuses on the aggregate level

et al. 2016

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The increased concentration of an element in plant biomass compared to the soil mass is an essential condition for the differentiated spatial distribution and status of the element on the aggregate level. Two forms of this differentiation have been revealed for 137 Cs and 90 Sr. Transfer of 137 Cs from plant roots and concentration on the surface of soil aggregates have been established experimentally. Indirect data also point to the potential localization of 137 Sc on the surface of intraaggregate pores. The effect of radionuclide concentrating on the outer and inner surfaces of aggregates is due to the rapid and strong fixation of cesium microamounts by mineral soil components. 137 Cs from the surface of aggregates is more available for the repeated uptake by plant roots than from the intraped mass. The distortion of this spatial differentiation mainly occurs during the reaggregation of soil mass, which in turn decreases the availability of the radionuclide to plants. For 90 Sr, its elevated concentration in the form of organic residues has been revealed in the inter-and intraaggregate pore space. However, due to the high diffusion rate, 90 Sr is relatively rapidly (during several months under pot experimental conditions) redistributed throughout the entire volume of soil aggregates and its major part gradually passes into the phase of humic compounds, to which the radionuclide is bound by exchange sorption. The high level of the next root uptake (higher than for 137 Cs by one to two orders of magnitude) favors the permanent renewal of loci with increased 90 Sr concentrations in the inter-and intraaggregate pore space in the form of plant residues.

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Method of studying the degradation of soil macroaggregates based on the self-absorption of 137Cs β radiation

Cited by 3 publications

References 1 publication

Extraction equilibrium and thermodynamics of cesium with a new derivative of calix[4]biscrown

Extraction equilibrium and thermodynamics of cesium with a new derivative of calix[4]biscrown

Input of 137Cs and 90Sr into plants from the surface of soil aggregates and the intraped space

Role of plants in the spatial differentiation of 137Cs and 90Sr statuses on the aggregate level

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