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本文论述了用8-羟基喹啉和5-硝基-8-羟基喹啉在常温下萃取Nb的平衡分配系数与pH和试剂浓度的函数关系。这两种8-羟基喹啉可分别与Nb形成络合比为1:3的螯合物。在用8-羟基喹啉萃取铌时,当加入5-硝基-8-羟基喹啉后形成了二元混配络合物NbQ_3·（5-NO_2-8-HQ）_2,表明有协同萃取现象发生。其协同系数可以求得。若在吡啶和吡啶的甲基衍生物存在下,则协同作用加强,形成一元一络合物,其络合比根据平衡数据求得为1:1。
This article discusses the equilibrium partition coefficient of Nb extracted with 8-hydroxyquinoline and 5-nitro-8-quinolinolate at room temperature as a function of pH and reagent concentration. The two 8-hydroxyquinolines each form a chelate complex with Nb at a complex ratio of 1: 3. In the extraction of niobium with 8-hydroxyquinoline, the binary mixed complex NbQ_3 · (5-NO_2-8-HQ) _2 was formed when 5-nitro-8-hydroxyquinoline was added, Phenomenon happened. Its synergy coefficient can be obtained. If pyridine and pyridine in the presence of methyl derivatives, the synergistic effect is strengthened to form a mono-complex, the complex ratio based on the equilibrium data obtained as 1: 1.