Neptunium migration in oxidizing clayey sand
作者： G. Bidoglio , P. Offermann , A. Saltelli
DOI: 10.1016/0883-2927(87)90043-6
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摘要: Abstract The rate and mechanism of Np migration were investigated in a flowing water/clayey sand system under oxidizing conditions. A 237 Np-doped borosilicate glass was used as source contaminant the experiments. preliminary study chemical speciation water leachate allowed identification soluble cationic anionic carbonate species Np(V). formation constants Np(V) complexes corrected for ionic strength rgroundwater by making use Guggenheim-Scatchard specific interaction theory. values then to model partitioning between soil phase. Increasing concentration solution resulted decrease amount sorbed on surface. Yet such is lower than that calculated assuming uptake species. This interpreted simultaneous sorption NpO 2 + (CO 3 ) − . individual distribution coefficients two from static tests. kinetic developed, including rapid reactions slow interconversion Such could account chromatographic separation observed system. Analytical solutions transport equation best-fit analysis column profiles. Both reaction dissociation kinetics considered model.
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