Plutonium complexes

Plutonium breeder LMFBR fuels, 6, 926 Plutonium carbide nuclear fuels, 6, 928 Plutonium complexes, 3,1131-1215 cupferron, 2, 510 Plutonium(III) complexes... 

Measurement of the stability constants of plutonium complexes is hampered by difficulties of maintaining a particular oxidation state. Formation of complexes of Pu+3, except in very acid solutions, is accompanied and often obscured by complexation catalyzed oxidation to Pu+lt. Study of complexation of Pu+lt is often confused by competition with hydrolysis above pH 1-2. 

Plutonium Complexes with Natural Complexing Agents... 

These studies show the usefulness of relative data for the prediction of plutonium complexation with natural ligands. They... 

The chemistry of waste treatment processes and the development of new processes are fertile areas of research work. The speciation of plutonium in basic and laundry wastes is needed. For example, if soluble plutonium complexes in basic wastes can be destroyed, perhaps ultrafiltration could replace the flocculent-carrier precipitation process. The chemistry of plutonium(VII) and of ferrites—a candidate waste treatment process—needs to be explored.(23)... 

Plutonium(IV), hydrolysis of, 19 698 Plutonium-231, 19 670 Plutonium-238, 19 668, 669, 675 special precautions for, 19 703 Plutonium-239, 19 669 Plutonium aqua ions, thermodynamic values for, 19 693t Plutonium carbide, 4 649t stoichiometry, 4 651 Plutonium carbide (2 3), 4 649t Plutonium carbides, 19 690-691 Plutonium cations, 19 692 Plutonium chalcogenides, 19 691 Plutonium complexes bonding in, 19 694—695 formation constants for, 19 697t... 

Cleveland (16) has reviewed the chemistry of plutonium complexes and at this point it is intended to discuss only a few of the more frequently encountered complexes and return to the subject during the review of complexing agents in the biosphere. 

Plutonium complexes with many of the inorganic anions, and this ability is inversely related to the strength of the acid from which the anion is derived. In the case of Pu(III) the order of complexing is... 

As a consequence of the conjecture that sewage could contain plutonium complexing agents which might make the element more available to vegetation Myers et al. (139) evaluated this potential transport mechanism and concluded that no such chemicals were present. 

Step 10. Transfer the sample solution to the reservoir of the conditioned column. (See Fig. 15.4 and column preparation procedure given below.) Rinse the sample beaker twice with 15 mL portions of 8 M HN03 and add both to the sample in the reservoir. Pass the sample through the column at a flow rate of approximately 2 mL per minute. If the flow rate is too fast, the plutonium complex will not have time to absorb onto the resin and the recovery will be low. 

Cauchetier, P., and Guichard, C. Electrochemical and spectro-photometric study of plutonium complexes with EDTA. Pluto-nium(V) and (VI), J. Inorg. Nucl. Chem., 1771 (1975). Kabanova, 0. L. Plutonium(V) complexes with ethylenediaminetetraacetic acid, Russ. J. Inorg. Chem., 401 (1961). 

Here is how SAL works Samples are received in a reception and storage room, then routed to the appropriate wet chemical analysis laboratory. There, they are analysed for uranium, thorium or plutonium content, and purified aliquots (portions of the sample) are prepared for the isotopic analysis of three elements. Isotopic analyses are performed routinely by mass spectrometry, and radiometric techniques are used for back-up. Emission spectrography serves to detect the presence of impurities which could interfere with the measurements and thus distort the results of the chemical and isotopic analysis of uranium, thorium and plutonium. Complex calculations and quality checks are performed on minicomputers, which are connected in a network to a central laboratory mini-computer. A central laboratory data system stores and provides analytical reports and enables the quality of the analyses and the status of the flow of samples through the laboratory at any time to be monitored. 

Hydroxyquinoline and derivatives. Trivalent plutonium complexes with 8-hydroxyquino-line (Oxine, Ox) of the formula An(Ox)3 are prepared by precipitation from aqueous solution in the presence of sulyite or dithionite as a reducing agent (to retain An ). Attempts to prepare analogous and Np complexes result in immediate oxidation. 

Neptunium and plutonium complexes [AnL4] with 8-hydroxyquinoline and its derivatives were obtained in the form of solid compounds (L=Ox, MOx, COx, DCOx) [62], In all cases the coordination number of metal atom is equal to 8, while Th(IV) and U(IV) are known to form complexes H[M(Ox)5] [114], Stability constants were determined by solvent extraction and are equal to logy04=45.28 and logy04=46.O5 for Np complexes with Ox and DCOx, respectively [62],... 

Hexavalent neptunium and plutonium complexes with 2-pyrazinecarboxylic acid [Np02(Pyraz)2(H20)j 2H2O and [Pu02(Pyraz)2(H20)j 2H2O were reported in the work [99], These compounds were found isostructural to previously studied uranyl complex [137], In Table 13 the unit cell parameters calculated from the powder diffraction patterns are compared with cell parameters for the uranyl complex. 

Plutonium complex H[Pu02(0x)3] is described in the work [138]. Another attempt to synthesize solid Pu compounds with Ox was made in the work [65], but authors found that Pu(VI) is reduced in conditions suitable for synthesis. Work [103] describes structure of Np complex with bis(salicylidene)-ethylenediamine [Np02(0H4C6HC=NCH2CH2N=CHC6H40)(CH30H)] (26). 

The problem with Dowex 50W-X8 is the slow recovery of plutonium. Again, it is suggested that this is because of the oxidation of Pu(lll) to Pu(IV) and formation of the hexanitrato plutonium complex Pu(lV) is more tightly held than Pu(lll) and the bulky hexanitrato complex has difficulty diffusing through the polymer matrix. We cannot explain why plutonium recovery is poorer from the Na-K-Mg residue than from the Ca-K-Mg residue whereas americium recovery is better from the Na-K-Mg system and worse from the Ca-K-Mg system. The mean + standard deviation for the duplicate tests suggests the effect is real. 

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