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本工作在制备并稳定3、4价Pu基础上,系统研究了它们在稀TBP/煤油与水相间的分配。考察了25℃下用5％TBP/煤油萃取时硝酸浓度、硝酸铝浓度、U（Ⅵ）浓度对Pu（Ⅲ,Ⅵ）萃取分配的影响,确定了Pu（Ⅲ,Ⅳ）萃取时所结合硝酸根的个数分别为3和4;考察了TBP浓度对它们萃取的影响,确定了TBP萃取Pu（Ⅲ,Ⅳ）的反应方程式和25℃下反应的表观平衡常数分别为:
Based on the preparation and stabilization of 3, 4-valent Pu, this work systematically studied the distribution of dilute TBP / kerosene and aqueous phase. The effects of concentration of nitric acid, concentration of aluminum nitrate and concentration of U (Ⅵ) on the extraction and distribution of Pu (Ⅲ, Ⅵ) at 25 ℃ under 5% TBP / kerosene extraction were investigated. The number of roots was 3 and 4, respectively. The effect of TBP concentration on their extraction was investigated. The reaction equation of TBP extraction Pu (Ⅲ, Ⅳ) and apparent equilibrium constant at 25 ℃ were determined as follows: