2,6-双(5,6-二异丙基-1,2,4-三唑-3)吡啶对镅和铕的萃取

Extraction of Am and Eu With iPr-BTP

摘要: 为了解2,6-双(5,6-二异丙基-1,2,4-三唑-3)吡啶（iPr-BTP）在硝酸介质中对镅和铕的萃取行为，以30%辛醇/正十二烷溶液为稀释剂，考察了稀释剂的组成、萃取时间、硝酸浓度、萃取剂浓度及硝酸钠浓度对iPr-BTP萃取Am(Ⅲ)和Eu(Ⅲ)的影响，确定了萃合物组成和萃取反应方程式。实验结果表明，该萃取剂对镅的萃取能力较强，而对铕的萃取能力较弱。iPr-BTP对Am(Ⅲ)和Eu(Ⅲ)的萃取反应方程式可表示为：
M³⁺+3NO^-₃+3(iPr-BTP)_(o)→M(NO₃)₃·3(iPr-BTP)_(o)。

Abstract: Using 30% n-octanol/n-dodecane as diluent, the extraction behavior of Am(Ⅲ) and Eu(Ⅲ) from nitric acid solution was studied with 2,6-bis-(5,6-di-isopropyl1,2,4-triazin-3-yl)pyridine (iPr-BTP). By investigating the influences of the concentration of nitric acid, the concentration of iPr-BTP, diluent composition and the contact time and the concentration of NaNO₃ on the distribution ratio of Am(Ⅲ) and Eu(Ⅲ), the composition of the extraction complexes and the extraction reaction equation were deduced. The extraction reaction equation may be expressed as follows:
M³⁺+3NO^-₃+3(iPr-BTP)_(o)→M(NO₃)₃·3(iPr-BTP)_(o).The results show that the capability of extracting americium by iPr-BTP is higher than that of extracting europium.
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