| 초록 |
Hydroxamic acids, as hydrophilic complexants for tetravalent actinides, are also reducing agents, which are probably thermodynamically capable of reducing Np(VI). Especially, the reduction of Np(VI) to Np(V) by acetohydroxamic acid(AHA) was found to be rapid and complete. Further reduction of Np(V) to Np(IV) by AHA, as determined by the onset potentials, is not expected since the hydrolysis of AHA by nitric acid is likely be much faster than the reduction of Np(V) to Np(IV) which requires a breaking of the covalent Np-O bonds in NpO2+. AHA is unstable in acid solution and hydrolyse to the parent carboxylic acid and hydroxylamine. The reaction kinetic of this reaction has been determined and is described. Rate constant at 25°C is 0.0015mol/l.min. |
