以二(2-乙基己基)磷酸(HDEHP)为载体,考察了搅拌速度、温度、石蜡及表面活性剂对大块液膜迁移铕离子的影响,获得了各种实验条件下的表观反应速率常数,萃取和反萃取的表观反应活化能分别为10.7 kJ/mol和29.2 kJ/mol.结果表明,萃取过程扩散为控速步骤,反萃取过程化学反应亦为控速步骤,Eu(Ⅲ)离子的跨膜迁移过程可以以两个串联的准一级不可逆过程进行描述.
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