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Report No.

Stability constants of minor actinides and lanthanides with dithiocarbamate

Miyashita, Sunao; Kitatsuji, Yoshihiro  ; Kimura, Takaumi 

The stability constants of trivalent minor actinides (An$$^{3+}$$; $$^{241}$$Am and $$^{244}$$Cm) and lanthanides (Ln$$^{3+}$$; Eu) with Ammonium pyrrolidinedithiocarbamate (APDC) in aqueous solution were investigated. The stability constants were obtained by back-extraction technique using di(2-ethylhexyl)phosphoric acid (HDEHP) as follows. Aqueous phase was acetic buffer solution from 0.02 to 0.10 mol/cm$$^3$$ containing various concentrations of APDC. Organic phase was toluene or benzene solution containing HDEHP and trace amounts of the extracted radionuclide such as $$^{241}$$Am or $$^{244}$$Cm. Eqvolumes of the aqueous phase and the organic phase were mixed in vial and were shaken 30 minutes at 298 ${it K}$. The results show that minor actinides strongly interacted with dithiocarbamate. From those results, the obtained stability constants ($$ beta_n$$, ${it n}$ = 1, 2) for Am are log$$ beta_1$$(Am) = 2.5 $$pm$$ 0.3, log$$ beta_2$$(Am) = 4.3 $$pm$$ 0.2 at 298 ${it K}$.



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