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本文研究了硝酸体系中十种不同结构的冠醚在不同硝酸浓度下对镎(Ⅳ)的萃取,实验结果表明,镎(Ⅳ)的萃取与有机相中萃合物的形式、多醚环上取代基的结构以及水相硝酸浓度等因素有很大关系,其中以二环已基-18-冠-6为最好。 研究了11种稀释剂并观察了分配比与介电常数之间的关系,最后选择强极性溶剂1,2-二氯乙烷为稀释剂。在1,2-二氯乙烷-7.5M HNO_3 条件下,初步实验结果表明络合物的组成为1:1。同时测定了其它金属离子的分配比,并计算了相应的分离系数。
In this paper, ten kinds of crown ethers with different structures in nitric acid system were studied for extracting 镎 (Ⅳ) under different concentrations of nitric acid. The experimental results show that the extraction of 镎 (Ⅳ) Substituent structure and the concentration of nitric acid in aqueous phase and other factors have a great relationship, of which bicyclohexyl-18-crown -6 is the best. Eleven different diluents were investigated and the relationship between the partition ratio and the dielectric constant was observed. Finally, the strong polar solvent 1,2-dichloroethane was selected as the diluent. Under the condition of 1,2-dichloroethane-7.5M HNO3, the preliminary experimental results show that the composition of the complex is 1: 1. The distribution ratios of other metal ions were also determined, and the corresponding separation coefficients were calculated.