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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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