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采用下降单液滴法研究了２－乙基己基膦酸单２－乙基己基酯从硝酸介质中萃取铥（Ⅲ）的动力学，测定了不同萃取条件下的萃取速率，提出了萃取速率方程，并对萃取机理进行了探讨。
The drop single drop method was used to study the kinetics of extraction of 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester from nitric acid medium. The extraction rate under different extraction conditions was determined. The extraction rate equation , And the extraction mechanism was discussed.