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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。
In this paper, the interaction between Fe ~ (2 +), SA (sulfamic acid) and HNO_2, H_2O_2, HNO_3 was studied. Experiments show that SA can effectively avoid HNO_2 oxidation of Fe ~ (2+), but can not prevent the oxidation of H_2O_2 due to radiolysis. SA also can not prevent HNO 3 direct oxidation of Fe ~ (2+). To stabilize different concentrations of Fe ~ (2+) in HNO_3 solution, different amounts of SA are needed. The valence of Pu in solution of 1.5MHNO_3-1.5MAl (NO_3) _3 depends on the value of [Fe ~ (3 +)] / [Fe ~ (2+)]. The apparent potential of Fe ~ (3 +) - Fe ~ (2+) in 1.5MHNO_3-1.5MAl (NO_3) _3 solution was determined to be about 777mV (S.H.E.). When the value of [Fe ~ (3 +)] / [Fe ~ (2+)] is high, there is an abnormal leap in the potential of Fe ~ (3 +) - Fe ~ ~ (3 +)] / [Fe ~ (2+)] and the surface state of the Pt electrode. The results show that the value of [Fe 3+] / [Fe 2+] can still be estimated by the Redox potential of the measurement solution considering the influence of the above factors, and then the valence of Pu can be judged.