氨基磺酸亚铁作还原剂在调节高浓缩铀靶元件溶解液时的作用
THE ROLE OF FERROUS SULFAMATE AS REDUCTANT IN VALANCY ADJUSTMENT OF HIGHLY ENRICHED URANIUM FEED SOLUTION
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摘要: 本文研究了Fe~(2+)、SA(氨基磺酸)与HNO_2、H_2O_2、HNO_3的相互作用。实验表明SA能有效地避免HNO_2氧化Fe~(2+),但不能阻止因辐解产生的H_2O_2的氧化作用。SA也不能防止HNO_3直接氧化Fe~(2+)。在HNO_3溶液中要稳定不同浓度的Fe~(2+),需要有不同量的SA。Pu在1.5MHNO_3-1.5MAl(NO_3)_3的溶液中的价态变化取决于Fe~(3+)/Fe~(2+)值。 测定了1.5MHNO_3-1.5MAl(NO_3)_3溶液中Fe~(3+)-Fe~(2+)电对的表观电位约为777mV(S.H.E.)。当Fe~(3+)/Fe~(2+)值较高时,Fe~(3+)-Fe~(2+)电对电位会出现异常的飞跃,该飞跃与Fe~(3+)/Fe~(2+)值及Pt电极的表面状态有关。研究表明,考虑到上述因素的影响,Fe~(3+)/Fe~(2+)值仍可用测定溶液的Redox电位来估算,进而可对Pu的价态变化作出判断。Abstract: 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.
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