The nitrate complexes of tetravalent plutonium

Solvent Extraction of Inorganic Species.

“…Most of the studies with nitric acid dealt with the extraction of the actinides and of fission products. The tetravalent actinides are extracted as (R3NH)2M-(N03)6 where M is Th, U, Np and Pu (29,46,55,163,192,193,215,354,375,449), whereas hexavalent uranium is extracted as (R3NH)U02(N03)3 (29,163,192,193,215,361,421,428) as probably also are neptunium and plutonium (192,441). The spectra of the tetra-and hexavalent actinides in the organic phase have been published (192) and found to be similar to the solid compounds obtained with quaternary ammonium salts.…”

Highly efficient diglycolamide-functionalized dendrimers for the sequestration of tetravalent actinides: solvent extraction and theoretical studies

“…For the computation of K ex 0 , the value of K Nit was taken as 40.5 and 105 for Np(IV) and Pu(IV), respectively, at 3 M HNO 3 . [29][30][31] The value of 2.78 was used for the [NO 3 À ], calculated using a K a value of 23 for the dissociation of HNO 3 . 28 The values of the thermodynamic parameters DG, DH O and TDS were calculated as mentioned above.…”

The Influence of the Complex Formation between Octanol and Long-Chain-Quaternary Ammonium Nitrates in o-Xylene and n-Dodecane on the Extraction of Pu (IV)

“…As extracting agents tertiary amine nitrates of the type R'R"R"'NH · N0 3 (R', R", R'" represent aliphatic hydrocarbon chains with C 6 -C 24 ) and quaternary ammonium nitrates, Q's, of a rather similar structure like triauryl-methyl-ammonium nitrate, TLMA, or hexadecyl-dimethyl-benzyl-ammonium nitrate, HDDMBA, can be used [5]. In 3-4 M nitric acid the main Pu(IV) species is PU(N0 3 ) 3 + [6-9], although BBOTHEBS et al stated that in I-i M aqueous nitric acid, Pu(IV) is present as undissociated Pu(N0 3 ) 4 [10]. At higher nitrate concentrations also anionic plutonium nitrate complexes are formed.…”