Adsorption of High Oxidation State Ruthenium Anions on Filter Paper.

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Radioruthenium produced in relatively high fission yield shows complex behavior in nuclear fuel reprocessing, radioactive waste treatment and environmental samples. It is known that the chemical characteristics of ruthenium is quite complicated and determination of this element is very difficult, because ruthenium possesses many oxidation states, from +8 to zero, and related compoundsm(1)(3). In radiochemical analysis of ruthenium, coprecipitation with insoluble metal salts such as ferric hydroxide, cobalt sulfide is often used as the first step for concentrating or as an effective means for scavenging. The most widely used method for the separation of radioruthenium from other fission products is to distill as gaseous tetroxide (RuO4) at high temperature. However, experimental techniques of coprecipitation and distillation are usually rather troublesome and time-consuming(4). In addition, quantitative coprecipitation and perfect distillation are difficult in some kinds of chemical species.It is known that ruthenium metal or insoluble oxides are very hard to dissolve by strong acidic solutions, such as hydrochloric acid, nitric acid and sulfuric acid. However these insoluble ruthenium species can be dissolved in a sodium hydroxidesolution by forming high oxidation state anions such as ruthenate or perruthenate with oxidizing agent, sodium hypochlorite(4). In this study the authors have made experiments on the adsorption behavior of high oxidation state anions of ruthenium on filter paper from sodium hydroxide solution and the possibility of application to simple, rapid and selective separation of radioruthenium from other important radionuclides.
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Adsorption of High Oxidation State Ruthenium Anions on Filter Paper.

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