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本文研究了在水相-氯仿间以邻菲绕啉和水杨酸萃取三价稀土离子的行为,实验表明,稀土的萃取分配比与原子序数的关系亦呈现“四分组效应”,络合物的萃取与平衡水相的pH值有着密切的关系。借萃取光度法测定了三元络合物在CHCl_3中的组成。在pH=4时,萃合物的组分为R_E phen(Sal)_3,而在pH=5.5时,萃合物中稀土与邻菲绕啉分子数之比为R_E:phen=1:2. 平衡水相的pH=4时钇表现出不同于所有镧系元素的萃取性质。确定了温度变化对稀土萃取的影响不大,萃合热△H_(ex)≈0。
In this paper, the extraction of trivalent rare earth ions from phenanthroline and salicylic acid between aqueous and chloroform was studied. The experimental results show that the relationship between extraction and distribution ratio of rare earth and atomic number also shows “quadruple group effect”, complex The extraction and the balance of the pH of aqueous phase are closely related. The composition of ternary complex in CHCl_3 was determined by extraction spectrophotometry. At pH = 4, the composition of the extract was R_E phen (Sal) _3, while the pH value was 5.5, the ratio of Rare earth to phenanthroline was R_E: phen = 1: 2. Yttrium exhibits different extraction properties than all lanthanides at pH = 4 when the aqueous phase is equilibrated. The effect of temperature on the extraction of rare earth is not obvious, and the heat of extraction △ H_ (ex) ≈0.