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The extraction of uranyl nitrate by novel extractants of N,N-dimethyl-N’,N’-dioctylsuccinylamide(DMDOSA)and N,N-dimethyl-N’,N’-didecylsuccinylamide(DMDDSA) from aqueous nitric/nitrate solutions was investigated.It was found both the concentration of HNO_3 and extractants had an effect on the U(Ⅵ) extraction distribution.The extraction mechanism was established,and stoichiometry of the main extracted species was confirmed to be UO_2(NO_3)_2·2DMDOSA and UO_2(NO_3)_2·2DMDDSA,respectively.Both of the extraction reactions are exothermic.FTIR spectral study of the U(Ⅵ) extracted species was also made.
The extraction of uranyl nitrate by novel extractants of N, N-dimethyl-N ’, N’-dioctylsuccinylamide (DMDOSA) and N, N-dimethyl- N’, N’-didecylsuccinylamide (DMDDSA) from aqueous nitric / nitrate solutions was investigated .It was found both of the concentration of HNO_3 and extractants had an effect on the U (VI) extraction distribution was established, and stoichiometry of the main extracted species was confirmed to be UO_2 (NO_3) _2 · 2DMDOSA and UO_2 NO_3) _2 · 2DMDDSA, respectively. Both of the extraction reactions are exothermic. FTIR spectral study of the U (Ⅵ) extracted species was also made.