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本文用分配比测定平衡常数法、等摩尔系列法测萃合物组成,用凝固点降低法测有机相TOA的表观分子量,并以萃合物的红外光谱加以佐证。实验表明在C~0_H_2SO=1.97M时,TOA萃取U(VI)生成的萃台物为(R_3NH)_4UO_2(SO_4)_3,logβ_10=4.83;在pH=2.3、[SO_4~(2-)]=0.5M时,则生成(R_3NH)_2UO_2(SO_4)_2萃合物,萃取平衡常数logβ＇_10=10.0。胺铀比从4:1转变为2:1,这就解释了为什么pH>2时D_U又回升的现象。
In this paper, the equilibrium constant method was used to determine the equilibria and the equimolar series method was used to determine the composition of the extract. The apparent molecular weight of TOA in the organic phase was determined by the freezing point reduction method and was corroborated by the infrared spectrum of the extract. The experimental results showed that (R_3NH) _4UO_2 (SO_4) _3 and logβ_10 = 4.83 were obtained by TOA extraction of U (VI) at C ~ 0_H_2SO = 1.97M and at pH = 2.3 [SO_4 ~ (2 -)] 0.5M, (R_3NH) _2UO_2 (SO_4) _2 extract was obtained, the extraction equilibrium constant logβ’_10 = 10.0. The ratio of amine to uranium changes from 4: 1 to 2: 1, which explains why D_U rises again when pH> 2.