酸度和温度对铥、镱、铁分离的影响机理

Effect Mechanism of Acidity and Temperature on Separation of Thulium (Ⅲ),Ytterbium (Ⅲ) and Iron(Ⅲ)

研究了用CL-P507-HCl体系色层柱分离稀土元素铥、镱和非稀土元素铁,讨论了分配比、分离因数与酸度和温度的关系,计算得到50℃下铥和镱的分离因数为3.08,△E(Tm)=-8.85J/mol,△E(Yb):-4.56 J/mol,并解释了lgD—lg[H^+]关系图中铁的V字型曲线。

Effect of acidity and temperature on separatio, of thulium （Ⅲ）, ytterbium （Ⅲ） and iron （Ⅲ） by extraction chromatography in the system of 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester [HEH（EHP）]-HCl has been studied. The separating factor of thulium （Ⅲ） and ytterbium （Ⅲ） at 50 ℃ is 3.08, the enthalpy increment of Thulium （Ⅲ） and Ytterbium （Ⅲ） are -8.85 J/mol and -4. 56 J/mol, respectively. The reason for V-shaped curve of lgD-lg[H^＋] for iron （Ⅲ） was discussed.