一种新的A＋B_1＋B_2型铀（Ⅵ）三元协萃体系

A NEW TERNARY SYNERGISTIC EXTRACTION SYSTEM FOR URANIUM(Ⅵ)

研究了４，４＇－癸二酰－双－（１－苯基－３－甲基－５－吡唑啉酮）（ＤＢＰＭＰ）、磷酸三丁酯（ＴＢＰ）及吡啶（Ｐｙ）组成的三元体系从硝酸溶液中萃取铀（Ⅵ）的协同效应。用斜率法确定了三元协萃配合物的组成。计算了协萃反应的平衡常数。制备了固体三元协萃配合物，并对它作了元素分析、红外光谱（ＩＲ）及核磁共振（￣１ＨＮＭＲ）等分析测试。

The synergistic extraction for U(Ⅵ) from nitric acid solution is studiedied using 4,4'-decane-dioyl-bis-( 1- phenyl- 3-methyl- 5-pyrazolone)as chelate extractant,TBP and Pyridine as the firstand second neutral synergistic extractants. The constituent of the extracted complex is confirmedto be UO_2A·TBp·Py by the usual slope methed,The equilibrium constant of this ternary syner-gistic extraction reaction is evaluated. Elemental analyses,IR and ￣1HNMR are made for the solidextracted compound isolated.