THE ROLE OF FERROUS SULFAMATE AS REDUCTANT IN VALANCY ADJUSTMENT OF HIGHLY ENRICHED URANIUM FEED SOLUTION

In the study of the interaction of Fe2+, SA with HNO2, H2O2 and HNO3, it was found that SA is effective for preventing oxidizing action of HNO2 but not of radiolytically formed H2O2 on Fe2+. SA could not protect Fe2+ from direct oxidation by HNO3. The quantity of SA required to stabilize Fe2+ in HNO3 solution depends on the latter's concentration. The valency change of Pu in 1.5 M HNO 3-1.5M Al (NO3) 3 solution depends on Fe3+/Fe2+ value.The potential measurement of solution containing 1.5M HNO3-1.5M Al (NO3)3 was accomplished. The formal potential of Fe3+-Fe2+ couple in above mentioned solution is about 777 mV vs S. H. E.. An anomalous potential jump of Fe3+-Fe2+ couple was observed, when Fe3+/Fe2+ value is relatively high. The occurrence of anomalous potential jump depends on Fe3+/Fe2+ value and surface condition of Pt electrode. The Fe3+/Fe2+ value can be calculated over a wide range by measuring Redox potential in the solution and in turn used for estimating the change of Pu valency.