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在酸性4M氯化钠溶液中得到一很好的锑(Ⅲ)可逆扩散波。此波随加入乙二胺四乙酸量而减低、且稍向负电位移动,在更负电位处又出现另一不可逆波,二波之和与溶液pH和乙二胺四乙酸的浓度无关。经多种实验的验证,第一波(较正波)为可逆三电子反应动力波,是受络合物SbY的离解速率控制。用Koryta提出的动力波半波电位求络合物稳定常数的方法测定锑(Ⅲ)-乙二胺四乙酸络合物的稳定常数和反应自由能等热力学函数;用Hanus近似法推出动力电流方程式,测定络合物离解速率常数和反应活化能;并探讨各相应的电极过程。
A good antimony (Ⅲ) reversible wave is obtained in acidic 4M sodium chloride solution. This wave decreases with the amount of ethylenediaminetetraacetic acid and slightly shifted to negative potential. At the more negative potential, another irreversible wave appears. The sum of the two waves has nothing to do with the solution pH and ethylenediaminetetraacetic acid concentration. After many experiments verify that the first wave (more positive) reversible three-electron reaction kinetic wave is controlled by the dissociation rate of complex SbY. The thermodynamic functions such as the stability constants and reaction free energies of antimony (Ⅲ) -ethylenediaminetetraacetic acid complex were determined by Koryta’s method of determining the stability constant of complex with the half-wave potential of the power wave. The kinetic current equation , Determination of complex dissociation rate constant and reaction activation energy; and to explore the corresponding electrode process.