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本文用示波极谱法、循环伏安法及新极谱法研究了四羟基蒽醌(THAQ)在碱性底液中的极谱行为,探讨了其阴、阳极电流峰的性质,求算了参与四羟基蒽醌电极反应的电子数和氢离子数以及THAQ的第三、四级离解常数,并论证了THAQ的电极反应机理。还研究了锆IV)-四羟基蒽醌络合物在示波极谱仪上产生灵敏的络合吸附波的形成条件,讨论了Zr-THAQ络合物电流峰的吸附特性,测定了Zr(IV)、THAQ络合物的组成比及相应的稳定常数,探讨了络合物的结构及其电极反应机理。最后,将Zr(IV)-THAQ络合物吸附波应用于钢铁、合金中微量锆的测定,对干扰离子的分离方法及条件进行了试验。所提出的方法操作简便、无毒,测定结果准确,令人满意。
In this paper, the polarographic behavior of tetrahydroxyanthraquinone (THAQ) in alkaline solution was investigated by oscillopolarography, cyclic voltammetry and neo-polarographic methods. The properties of the anodic and cathodic current peaks were discussed. The number of electrons and hydrogen ions involved in the tetrahydroxyanthraquinone electrode reaction and the third and fourth order dissociation constants of THAQ were discussed. The electrode reaction mechanism of THAQ was also demonstrated. The formation conditions of zirconium IV) -tetrahydroxyanthraquinone complex on the oscillopolarographic polarography were also studied. The adsorption characteristics of Zr-THAQ complex current peak were discussed. The Zr IV), the composition ratio of THAQ complex and the corresponding stability constants, the structure of the complex and the electrode reaction mechanism were discussed. Finally, the Zr (IV) -THAQ complex adsorptive wave was applied to the determination of trace zirconium in steel and alloy, and the method and conditions for the separation of interfering ions were tested. The proposed method is simple, non-toxic, accurate and satisfactory.