Effect of ozone on ruthenium species in alkaline medium – Part II: Oxidation of pentahydroxo nitrosyl ruthenate(II) ion RuNO(OH)52-
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Sébastien Floquet
Summary
Oxidation of the nitrosyl ruthenium complex RuNO(OH)52- has been carried out in sodium hydroxide solutions in contact with a gas flow containing ozone. The RuNO(OH)52- complex is converted successively into ruthenate and perruthenate ions. An empirical kinetic rate law for the first step has been determined and was shown to depend on concentrations of (i) the ruthenium complex, (ii) the hydroxide ions and (iii) ozone concentration in the gas flow. The second step of the reaction, corresponding to the perruthenate ion formation, shows a complex mechanism and four competing reactions have been proposed to represent it. The influences on the second step kinetics of several parameters such as ozone or hydroxide concentrations or the conditions of the gas-liquid exchange area are also qualitatively discussed.
© Oldenbourg Wissenschaftsverlag, München
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Articles in the same Issue
- Fission neutron spectrum averaged cross sections of some threshold reactions on cadmium: production feasibility of no-carrier-added 103Pd in a nuclear reactor
- Effect of ozone on ruthenium species in alkaline medium – Part I: Oxidative dissolution of ruthenium dioxide hydrate
- Effect of ozone on ruthenium species in alkaline medium – Part II: Oxidation of pentahydroxo nitrosyl ruthenate(II) ion RuNO(OH)52-
- Studies on thermal decomposition of uranium(VI) and thorium(IV) complexes of o-carboxy N,N′-dimethylbenzylamine by thermoanalytical techniques in static air atmosphere
- Experimental evidence for solubility limitation of the aqueous Ni(II) concentration and isotopic exchange of 63Ni in cementitious systems
- A study on the metal binding of humic acid by multitracer technique
- A simple assay method for added stable caesium in blood plasma
- Removal of mercury from water using pottery
- Berkelium nitrate complex formation using a solvent extraction technique
