Ruthenium Nitrosyl Complexes in Radioactive Waste Solutions of Reprocessing Plants.

Blasius, E.; Glatz, Jean‐Paul; Neumann, W.

doi:10.1524/ract.1981.29.23.159

Cited by 30 publications

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“…In pure nitric solutions of nitrato complexes the percentage of neutral complexes shows a linear increase with increasing HNO3 concentration [ 1]. A comparison of the Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 7/14/15 12:18 PM percentage of neutral complexes in simulated feed, HLW, and HLWC solutions reveals that the content of these is lowest in the simulated HLW and highest in simulated HLWC.…”

Section: Simulated Feed Hlw and Hlwc Solutionsmentioning

confidence: 95%

“…The average composition of the simulated HLW used has been given in Table 1 of Part I [ 1 ]. The Solution must stand for at least sixty days at 25 °C or five days at 60 °C to enable the ruthenium complexes attain equilibrium [1].…”

Section: Simulated Hlw Solutionmentioning

confidence: 99%

“…A steam distillation is then performed at a constant volume in order to lower the HNO3 concentration to 4-5 mol/1. All the anionic, neutral and cationic ruthenium nitrosyl nitrato species are identified by formulas and listed in Table 1 of Part I of this work [1]. Position isomers are not resolved by electrophoresis rather by capillary isotachophoresis [10].…”

Section: Simulated Hlwc Solutionmentioning

confidence: 99%

“…Table 1: Part I [ 1 ]) are unimportant when using formic acid or formaldehyde as denitrifying agent [1]. With the "in-tank" technique, however, considerable attention should be given to a) the behavior of mthenium nitrosyl nitrato complexes during denitration and the establishment of equilibria among the newly formed complexes thereafter b) a simplified preparation of simulated HLWC solutions suitable for optimizing experiments in the ceramic melting fumace c) the decomposition of ruthenium nitrosyl nitrato complexes during calcination.…”

Section: Introductionmentioning

confidence: 99%

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Ruthenium Nitrosyl Complexes in Radioactive Waste Solutions of Reprocessing Plants

1984

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Ruthenium complexes [Radioactive v/aste solutions /Reprocessing / Nitrosyl complexes of ruthenium SummaiyThe content of neutral ruthenium nitrosyl nitrato complexes found in high-level wastes (HLW) is similar to that in pure nitric solutions. Solutions with a high salt content, such as feed-solution or concentrated HLW (HLWC), contain a higher percentage of neutral complexes. The introduction of nitrous gases into simulated HLWC causes a lasting change of the complex equilibria by formation of nitro and nitro-nitrato complexes. After 30 days storage at 60 °C, the composition of the solutions treated with nitrous gases is practically the same as in the simulated HLWC stored for 30 days at 60°C. As to the latter Solution, a storage of 7 days is sufficient for experiments on the volatility of ruthenium during vitrification.

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Section: Simulated Feed Hlw and Hlwc Solutionsmentioning

confidence: 95%

Section: Simulated Hlw Solutionmentioning

confidence: 99%

Section: Simulated Hlwc Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ruthenium Nitrosyl Complexes in Radioactive Waste Solutions of Reprocessing Plants

1984

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“…In some studies [13,15,[22][23], the ruthenium species have been isolated and their nitrate-to-ruthenium ratios have been determined. Although the species with N0 3 /Ru = 0 were observed, the species were assigned exclusively to RuN0 3+ based on the assumption that the nitrosylruthenium bond is exceedingly difficult to break by substitution or oxidation-reduction reactions [3].…”

Section: Identification Of Ruthenium Species In Nitric Acid Solutionmentioning

confidence: 99%

Instability of Some Nitrosylruthenium Compounds in Nitric Acid

Satô¹

1989

Radiochimica Acta

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Α trivalent cation of ruthenium species was found in a certain proportion in nitric acid solution of some of the nitrosylruthenium compounds such as nitrosylruthenium trinitrate (RUN0(N0 3 ) 3 ), nitrosylruthenium hydroxide (RuNO(OH) 3 ) and disodium hydroxotetranitronitrosylruthenate (Na 2 RuNO(NO,) 4 OH · 2 H 3 0). The same species was also observed in nitric acid solution of ruthenium trichloride (RUC1 3 · 3 HjO). In order to determine whether the species is the nitrosylruthenium ion (RuNO' + ) or the hydrated ruthenium ion (Ru 3+ ), the species was separated from anionic, neutral and other cationic ruthenium ions by cation exchange chromatography. The species adsorbed on the cation exchange column was eluted by 6 Ν hydrochloric acid or 4 Ν nitric acid after thorough washing of the column by distilled water. The eluate was evaporated in a vacuum at room temperature. The residues did not show any absorption band in infrared spectrum in the vicinity of 1900 cm" 1 , characteristic of nitrosylruthenium compound. The determination of nitrogen content by Dumas's method showed that the residue obtained by elution with hydrochloric acid and the cation exchange resin adsorbing the species were free from nitrogen. The results obtained here revealed that the nitrosylruthenium bond, (Ru-NO), which has been considered to be a strong covalent bond, breaks in dilute nitric acid at room temperature.

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Praxis der Papier-, Dünnschicht- bzw. Säulenelektrophorese und Anwendungsbeispiele aus dem Bereich der anorganischen Chemie

Ziegler¹

1989

Praxis Der Elektrophoretischen Trennmethoden

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Ruthenium Nitrosyl Complexes in Radioactive Waste Solutions of Reprocessing Plants.

Cited by 30 publications

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Ruthenium Nitrosyl Complexes in Radioactive Waste Solutions of Reprocessing Plants

Ruthenium Nitrosyl Complexes in Radioactive Waste Solutions of Reprocessing Plants

Instability of Some Nitrosylruthenium Compounds in Nitric Acid

Praxis der Papier-, Dünnschicht- bzw. Säulenelektrophorese und Anwendungsbeispiele aus dem Bereich der anorganischen Chemie

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