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甲基膦酸二甲庚酯对硝酸介质中Pu(Ⅳ)的萃取

吴芳芳,刘占元,张烨,何辉,蒋德祥,唐洪彬,苏哲,谢书宝,李峰峰,陈延鑫

Journal of Nuclear and Radiochemistry（2021）

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Abstract
研究了HNO3介质中甲基膦酸二甲庚酯(DMHMP)对Pu(Ⅳ)的萃取性能,考察了DMHMP浓度、NO3-浓度、HNO3浓度以及温度对Pu(Ⅳ)分配比的影响.确定了DMHMP萃取Pu(Ⅳ)的萃合物的组成为Pu(NO3)4·2DMHMP,其萃取反应方程式为:Pu4+(a)+2DMHMP(o)+4NO3-(a)→Pu(NO3)4·2DMHMP(o)其中Pu(Ⅳ)与NO3-形成中性分子,再与DM HMP结合成为中性配合物进入有机相.在实验范围内Pu(Ⅳ)分配比与DM HMP浓度的平方、NO3-浓度的四次方成正比,萃取过程为放热反应,反应的焓变为-34.46 kJ/mol.
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