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- W2182709362 abstract "A large experience on problem of utilization of radioactive waste of AEPS activity is accumulated (see Review on Purex-process [1]) where at treatment of (RAW) a use of different methods of fractionation is recommended, in particular, an isolation of fractionation of noble metals (NM), creating certain difficulties at hardening and reduction in the further process before the burial. Solving the problem of fractional separation of noble metals (NM) in [2], we showed that at activated coal, modified by thiourea {СS (NH2)2}(TU) we managed to have palladium (one from NM of radioactive waste mass) from liquid nitric acid (6 N HNO3) up to 10 mg / 1g of coal. However, there was a problem on rate of sorption and mechanisms of transformation of palladium complexes with (TU) in the medium of HNO3 . In a number of papers devoted to the investigation of coordination properties of (TU) [3] the interaction of (TU) with HNO3 is not reflected in detail, though nitric acid cannot only give up proton, but also oxidize thiourea, what in its turn, can effect the steadiness of its complexes with Pd. The present paper is devoted to study of the behavior of palladium complexes in the system [Pd HNO3 СS (NH2)2], where by the assumption several parallel-sequentional processes with different rates can take place. Using the method of potentiometric titration in the cell with the platinum indicator and chloridesilver electrode of comparison with the bridge from 1M of KNO3, placed into the solutions, where titration conditions on thiourea, nitric acid and palladium content varied, we watched the process of formation of palladium complexes with thiourea (TU) in stages. The initial potential Pt in the system [HNO3 (TU)] is determined by the concentrations of the components, as well as, by the adsorption of the products of their interaction in the process of titration [4]. It was shown by the change of the potential that the first to precipitate quickly was brown sediment, where the relation of Pd to (TU) {H} = 1:1 and 1:2. To get a soluble complex with the ratio of = 1:3 of orange color while adding the soluble (TU) the potential changes still more slowly, i.e. a displacement of the third acido-ligand is difficult. At (H) = 1:4 and higher a complex of the lightyellow color is formed. At the excess of (TU) the potential of the Pt-electrode drops abruptly corresponding to the adsorption on the surface of the product of the first stage of oxidation of thiourea [5]." @default.
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- W2182709362 date "2002-01-01" @default.
- W2182709362 modified "2023-09-27" @default.
- W2182709362 title "EXPERIMENTAL STUDY OF KINETICS AND MECHANISM OF SEPARATION OF PALLADIUM BY THIOUREA FROM NITRIC ACID SOLUTIONS WHILE SOLVING THE PROBLEMS OF SEPARATION OF LIQUID RADIOACTIVE WASTE (RAW)" @default.
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