Radiochemische methode zur untersuchung der kinetik von elektrodenprozessen an metallelektroden

Abstract

Radiochemical measurements allow to detect one component of the two electrochemical partial processes in the region of the equilibrium potential and to determine its rate as a function of potential and of the concentration of the component in the solution A radiochemical-electrochemical technique has been developed for measurements on amalgam electrodes. For a continuous automatic recording of the radioactivity in solution which is in contact with the labelled amalgam, an apparatus has been used which consisted of a scintillation counter, an integrator and an automatic potentiometer. This technique allows the determination of the exchange current density and of the rate of the anodic partial process in the time shortly after the beginning of the exchange process when the radioactivity in the solution increases linearly with time. This method allows the determination of the electrode kinetic parameters (exchange current density, transfer coefficients) on amalgam electrodes. Furthermore, this method can be used to investigate with high sensitivity the electrochemical preparation and dissolution of amalgams. Another radiochemical technique was used to determine the extremely low rate of the anodic dissolution of passive platinum. The platinum anode was irradiated by neutrons (10 13 neutrons/ cm 2 sec). The corrosion rate was then determined by periodic measurements of the radioactivity in samples of the solution using a hundred chennel scintillation spectrometer.