Abstract: A process for reductive plutonium stripping from an organic reprocessing solution into an aqueous, nitric solution by use of an electrolytic current, in which the aqueous solution is free of agents for the stabilization of the reduced valence of the plutonium, a HNO.sub.3 concentration in the range of 0.05 to 1.0 mol/l is established in the aqueous solution, and the reduction of Pu(IV) to Pu(III) is carried out at a maximum temperature of 40.degree. C.

Abstract: A process for removing ammonium nitrate NH.sub.4 NO.sub.3 (AN) from an aqueous solution. At least one nitrogen-oxygen (N-O) compound in the form of NO.sub.x and/or N.sub.2 O.sub.2x, where x=1 or 2, is added to the aqueous solution containing the AN, the N-O compound being in gaseous or liquid state or as an ion present in an aqueous solution, at a temperature above room temperature but below the boiling point of the solution containing the AN and under normal pressure.

Abstract: Process for reducing the acid content of a nitric acid solution by using an electrolysis current which is capable of reducing HNO.sub.3 at the cathode. The nitric acid solution is divided into a first volume portion and a second volume portion. The first volume portion is reduced electrolytically to form a reaction product containing ammonium nitrite (AN). The second volume portion is reduced electrolytically to form a reaction product in the form of nitrous gases NO.sub.x, essentially NO and/or NO.sub.2. The reaction products are brought together and reacted at a temperature in the range from 50.degree. C. to below the boiling point of the solution resulting from the bringing together of the reaction products, by heating the resulting solution.