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在电位法、纸上电泳法研究硝酸银-氨-吡啶甲酸体系配合物组成的基础上,采用线性电位扫描、时间电位法、旋转圆盘电极和示踪原子等方法研究了该体系的阴极过程和吡啶甲酸的作用.结果表明,当溶液中硝酸银含量为5×10~(-3)M,pH=9.2,银(Ⅰ)、氨和吡啶甲酸的摩尔比为1:2.5:5左右时,α-吡啶甲酸体系在一定过电位区,存在混合配体配合物的均相前置转化速率控制步骤,而β(或γ)-吡啶甲酸体系则在相同条件下不存在前置转化速率控制步骤.示踪原子法的研究结果表明,三种吡啶甲酸均在银电极上有不同程度的吸附.在此基础上,分别探讨了电极反应的历程以及吡啶甲酸对电极过程的影响.
Based on the potentiometric method and on-paper electrophoresis, the composition of silver nitrate-ammonia-picolinic acid complex system was studied. The cathodic process of the system was studied by linear potential sweep, time-potential method, rotating disk electrode and tracer atom And picolinic acid.The results showed that when the silver nitrate content in solution was 5 × 10 -3 M, pH = 9.2, silver (Ⅰ), ammonia and picolinic acid molar ratio was about 1: 2.5: 5 , the α-picolinic acid system is in a certain overpotential area, and there is a homogeneous pre-conversion rate control step for the mixed ligand complex, whereas the β (or γ) -picolinic acid system does not have a pre-conversion rate control under the same conditions The results of the tracer method showed that all the three picolinic acids adsorbed on the silver electrode to some extent.On the basis of this, the course of the electrode reaction and the effect of picolinic acid on the electrode process were discussed respectively.