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本文研究了在硝酸—有机溶剂(与水互溶)介质中,添加剂、稀释剂、硝酸和萃取剂浓度,以及一些干扰物质等对HDEHP[二(2—乙基己基)磷酸]萃取Am(Ⅲ)和Pu(Ⅳ)的影响。并与纯硝酸介质进行比较,对Am的萃取机理和萃合物的组成作了初步探讨。测定了不同浓度硝酸反萃取分离Am、Pu的能力以及在硝酸—甲醇介质中Pu(Ⅳ)氧化态的稳定性。在此基础上提出了一个测定Pu中微量Am的方法,Am的回收率为(97±2)%,Pu的去污系数达7×10~3。
In this paper, the effects of concentration of additives, diluents, nitric acid and extractant, and some interfering substances on the extraction of Am (Ⅲ) from HDEHP [di (2-ethylhexyl) phosphoric acid] And Pu (Ⅳ). Compared with the pure nitric acid medium, the extraction mechanism of Am and the composition of the extract were discussed. The capability of Am, Pu separation by different concentrations of nitric acid for stripping and the stability of Pu (Ⅳ) oxidation state in nitric acid-methanol medium were determined. On this basis, a method for the determination of trace Am in Pu was proposed. The recovery rate of Am was 97 ± 2% and the decontamination coefficient of Pu was 7 × 10 ~ 3.