Extraction of ¹³⁷ Cs and ⁹⁰ Sr from Alkaline Solutions with High NaNo ₃ Content with Tetrahexyldicarbollide

The extraction properties of a new extractant, tetrahexyldicarbollylcobaltate, were studied. The reagent is stable in contact with alkaline solutions and permits (with the addition of PEG 400 or Slovafol 909) the extraction of both 95Sr and 137Cs from 1 M NaOH + 4 M NaNO3. The system studied was mainly 0.06 M reagent in isopropylbenzene + 1 vol% PEG 400. The extraction results compare well with the analogous reference system of nonsubstituted dicarbollylcobaltate in nitrobenzene. Possible ways of backextraction are discussed, and the system seems to be a candidate for further study for the separation of elements from high level waste in alkaline form and with a high NaNO3 content. The reagent and its application for the treatment of alkaline nuclear wastes was first proposed at Los Alamos National Laboratory, USA.

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